15283112fe
* refs/heads/tmp-5d7443e: Linux 4.19.93 spi: fsl: use platform_get_irq() instead of of_irq_to_resource() pinctrl: baytrail: Really serialize all register accesses tty/serial: atmel: fix out of range clock divider handling spi: fsl: don't map irq during probe gtp: avoid zero size hashtable gtp: fix an use-after-free in ipv4_pdp_find() gtp: fix wrong condition in gtp_genl_dump_pdp() tcp: do not send empty skb from tcp_write_xmit() tcp/dccp: fix possible race __inet_lookup_established() net: marvell: mvpp2: phylink requires the link interrupt gtp: do not allow adding duplicate tid and ms_addr pdp context net/dst: do not confirm neighbor for vxlan and geneve pmtu update sit: do not confirm neighbor when do pmtu update vti: do not confirm neighbor when do pmtu update tunnel: do not confirm neighbor when do pmtu update net/dst: add new function skb_dst_update_pmtu_no_confirm gtp: do not confirm neighbor when do pmtu update ip6_gre: do not confirm neighbor when do pmtu update net: add bool confirm_neigh parameter for dst_ops.update_pmtu vhost/vsock: accept only packets with the right dst_cid udp: fix integer overflow while computing available space in sk_rcvbuf tcp: Fix highest_sack and highest_sack_seq ptp: fix the race between the release of ptp_clock and cdev net: stmmac: dwmac-meson8b: Fix the RGMII TX delay on Meson8b/8m2 SoCs net/mlxfw: Fix out-of-memory error in mfa2 flash burning net: ena: fix napi handler misbehavior when the napi budget is zero hrtimer: Annotate lockless access to timer->state net: icmp: fix data-race in cmp_global_allow() net: add a READ_ONCE() in skb_peek_tail() inetpeer: fix data-race in inet_putpeer / inet_putpeer netfilter: bridge: make sure to pull arp header in br_nf_forward_arp() 6pack,mkiss: fix possible deadlock netfilter: ebtables: compat: reject all padding in matches/watchers filldir[64]: remove WARN_ON_ONCE() for bad directory entries Make filldir[64]() verify the directory entry filename is valid perf strbuf: Remove redundant va_end() in strbuf_addv() bonding: fix active-backup transition after link failure ALSA: hda - Downgrade error message for single-cmd fallback netfilter: nf_queue: enqueue skbs with NULL dst net, sysctl: Fix compiler warning when only cBPF is present x86/mce: Fix possibly incorrect severity calculation on AMD Revert "powerpc/vcpu: Assume dedicated processors as non-preempt" userfaultfd: require CAP_SYS_PTRACE for UFFD_FEATURE_EVENT_FORK kernel: sysctl: make drop_caches write-only mailbox: imx: Fix Tx doorbell shutdown path ocfs2: fix passing zero to 'PTR_ERR' warning s390/cpum_sf: Check for SDBT and SDB consistency libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.h s390/zcrypt: handle new reply code FILTERED_BY_HYPERVISOR perf regs: Make perf_reg_name() return "unknown" instead of NULL perf script: Fix brstackinsn for AUXTRACE cdrom: respect device capabilities during opening action powerpc: Don't add -mabi= flags when building with Clang scripts/kallsyms: fix definitely-lost memory leak apparmor: fix unsigned len comparison with less than zero gpio: mpc8xxx: Don't overwrite default irq_set_type callback scsi: target: iscsi: Wait for all commands to finish before freeing a session scsi: iscsi: Don't send data to unbound connection scsi: NCR5380: Add disconnect_mask module parameter scsi: scsi_debug: num_tgts must be >= 0 scsi: ufs: Fix error handing during hibern8 enter scsi: pm80xx: Fix for SATA device discovery watchdog: Fix the race between the release of watchdog_core_data and cdev HID: rmi: Check that the RMI_STARTED bit is set before unregistering the RMI transport device HID: Improve Windows Precision Touchpad detection. libnvdimm/btt: fix variable 'rc' set but not used ARM: 8937/1: spectre-v2: remove Brahma-B53 from hardening HID: logitech-hidpp: Silence intermittent get_battery_capacity errors HID: quirks: Add quirk for HP MSU1465 PIXART OEM mouse bcache: at least try to shrink 1 node in bch_mca_scan() clk: pxa: fix one of the pxa RTC clocks scsi: atari_scsi: sun3_scsi: Set sg_tablesize to 1 instead of SG_NONE powerpc/security: Fix wrong message when RFI Flush is disable PCI: rpaphp: Correctly match ibm, my-drc-index to drc-name when using drc-info PCI: rpaphp: Annotate and correctly byte swap DRC properties PCI: rpaphp: Don't rely on firmware feature to imply drc-info support powerpc/pseries/cmm: Implement release() function for sysfs device scsi: ufs: fix potential bug which ends in system hang PCI: rpaphp: Fix up pointer to first drc-info entry scsi: lpfc: fix: Coverity: lpfc_cmpl_els_rsp(): Null pointer dereferences fs/quota: handle overflows of sysctl fs.quota.* and report as unsigned long irqchip: ingenic: Error out if IRQ domain creation failed irqchip/irq-bcm7038-l1: Enable parent IRQ if necessary clk: clk-gpio: propagate rate change to parent clk: qcom: Allow constant ratio freq tables for rcg f2fs: fix to update dir's i_pino during cross_rename scsi: lpfc: Fix duplicate unreg_rpi error in port offline flow scsi: tracing: Fix handling of TRANSFER LENGTH == 0 for READ(6) and WRITE(6) jbd2: Fix statistics for the number of logged blocks ext4: iomap that extends beyond EOF should be marked dirty ext4: update direct I/O read lock pattern for IOCB_NOWAIT powerpc/book3s64/hash: Add cond_resched to avoid soft lockup warning powerpc/security/book3s64: Report L1TF status in sysfs clocksource/drivers/timer-of: Use unique device name instead of timer clocksource/drivers/asm9260: Add a check for of_clk_get leds: lm3692x: Handle failure to probe the regulator dma-debug: add a schedule point in debug_dma_dump_mappings() powerpc/tools: Don't quote $objdump in scripts powerpc/pseries: Don't fail hash page table insert for bolted mapping powerpc/pseries: Mark accumulate_stolen_time() as notrace scsi: hisi_sas: Replace in_softirq() check in hisi_sas_task_exec() scsi: csiostor: Don't enable IRQs too early scsi: lpfc: Fix SLI3 hba in loop mode not discovering devices scsi: target: compare full CHAP_A Algorithm strings dmaengine: xilinx_dma: Clear desc_pendingcount in xilinx_dma_reset iommu/tegra-smmu: Fix page tables in > 4 GiB memory iommu: rockchip: Free domain on .domain_free f2fs: fix to update time in lazytime mode Input: atmel_mxt_ts - disable IRQ across suspend scsi: lpfc: Fix locking on mailbox command completion scsi: mpt3sas: Fix clear pending bit in ioctl status scsi: lpfc: Fix discovery failures when target device connectivity bounces Conflicts: drivers/scsi/ufs/ufshcd.c kernel/time/hrtimer.c Change-Id: I9b69dbbc7cd2efa1c016ea10091fed73010b4c32 Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>
272 lines
7.0 KiB
C
272 lines
7.0 KiB
C
/*
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* Copyright (C) 2013 - 2014 Texas Instruments Incorporated - http://www.ti.com
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*
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* Authors:
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* Jyri Sarha <jsarha@ti.com>
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* Sergej Sawazki <ce3a@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Gpio controlled clock implementation
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*/
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#include <linux/clk-provider.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/of_device.h>
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/**
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* DOC: basic gpio gated clock which can be enabled and disabled
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* with gpio output
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* Traits of this clock:
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* prepare - clk_(un)prepare only ensures parent is (un)prepared
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* enable - clk_enable and clk_disable are functional & control gpio
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* rate - inherits rate from parent. No clk_set_rate support
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* parent - fixed parent. No clk_set_parent support
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*/
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static int clk_gpio_gate_enable(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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gpiod_set_value(clk->gpiod, 1);
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return 0;
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}
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static void clk_gpio_gate_disable(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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gpiod_set_value(clk->gpiod, 0);
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}
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static int clk_gpio_gate_is_enabled(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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return gpiod_get_value(clk->gpiod);
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}
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const struct clk_ops clk_gpio_gate_ops = {
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.enable = clk_gpio_gate_enable,
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.disable = clk_gpio_gate_disable,
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.is_enabled = clk_gpio_gate_is_enabled,
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};
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EXPORT_SYMBOL_GPL(clk_gpio_gate_ops);
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/**
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* DOC: basic clock multiplexer which can be controlled with a gpio output
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* Traits of this clock:
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* prepare - clk_prepare only ensures that parents are prepared
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* rate - rate is only affected by parent switching. No clk_set_rate support
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* parent - parent is adjustable through clk_set_parent
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*/
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static u8 clk_gpio_mux_get_parent(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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return gpiod_get_value_cansleep(clk->gpiod);
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}
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static int clk_gpio_mux_set_parent(struct clk_hw *hw, u8 index)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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gpiod_set_value_cansleep(clk->gpiod, index);
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return 0;
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}
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const struct clk_ops clk_gpio_mux_ops = {
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.get_parent = clk_gpio_mux_get_parent,
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.set_parent = clk_gpio_mux_set_parent,
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.determine_rate = __clk_mux_determine_rate,
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};
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EXPORT_SYMBOL_GPL(clk_gpio_mux_ops);
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static struct clk_hw *clk_register_gpio(struct device *dev, const char *name,
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const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
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unsigned long flags, const struct clk_ops *clk_gpio_ops)
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{
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struct clk_gpio *clk_gpio;
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struct clk_hw *hw;
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struct clk_init_data init = {};
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int err;
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if (dev)
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clk_gpio = devm_kzalloc(dev, sizeof(*clk_gpio), GFP_KERNEL);
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else
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clk_gpio = kzalloc(sizeof(*clk_gpio), GFP_KERNEL);
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if (!clk_gpio)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = clk_gpio_ops;
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init.flags = flags | CLK_IS_BASIC;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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clk_gpio->gpiod = gpiod;
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clk_gpio->hw.init = &init;
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hw = &clk_gpio->hw;
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if (dev)
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err = devm_clk_hw_register(dev, hw);
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else
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err = clk_hw_register(NULL, hw);
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hw->init = NULL;
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if (!err)
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return hw;
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if (!dev) {
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kfree(clk_gpio);
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}
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return ERR_PTR(err);
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}
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/**
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* clk_hw_register_gpio_gate - register a gpio clock gate with the clock
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* framework
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* @dev: device that is registering this clock
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* @name: name of this clock
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* @parent_name: name of this clock's parent
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* @gpiod: gpio descriptor to gate this clock
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* @flags: clock flags
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*/
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struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name,
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const char *parent_name, struct gpio_desc *gpiod,
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unsigned long flags)
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{
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return clk_register_gpio(dev, name,
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(parent_name ? &parent_name : NULL),
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(parent_name ? 1 : 0), gpiod, flags,
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&clk_gpio_gate_ops);
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}
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EXPORT_SYMBOL_GPL(clk_hw_register_gpio_gate);
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struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
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const char *parent_name, struct gpio_desc *gpiod,
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unsigned long flags)
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{
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struct clk_hw *hw;
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hw = clk_hw_register_gpio_gate(dev, name, parent_name, gpiod, flags);
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if (IS_ERR(hw))
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return ERR_CAST(hw);
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return hw->clk;
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}
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EXPORT_SYMBOL_GPL(clk_register_gpio_gate);
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/**
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* clk_hw_register_gpio_mux - register a gpio clock mux with the clock framework
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* @dev: device that is registering this clock
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* @name: name of this clock
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* @parent_names: names of this clock's parents
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* @num_parents: number of parents listed in @parent_names
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* @gpiod: gpio descriptor to gate this clock
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* @flags: clock flags
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*/
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struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name,
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const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
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unsigned long flags)
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{
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if (num_parents != 2) {
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pr_err("mux-clock %s must have 2 parents\n", name);
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return ERR_PTR(-EINVAL);
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}
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return clk_register_gpio(dev, name, parent_names, num_parents,
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gpiod, flags, &clk_gpio_mux_ops);
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}
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EXPORT_SYMBOL_GPL(clk_hw_register_gpio_mux);
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struct clk *clk_register_gpio_mux(struct device *dev, const char *name,
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const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
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unsigned long flags)
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{
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struct clk_hw *hw;
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hw = clk_hw_register_gpio_mux(dev, name, parent_names, num_parents,
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gpiod, flags);
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if (IS_ERR(hw))
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return ERR_CAST(hw);
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return hw->clk;
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}
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EXPORT_SYMBOL_GPL(clk_register_gpio_mux);
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static int gpio_clk_driver_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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const char **parent_names, *gpio_name;
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unsigned int num_parents;
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struct gpio_desc *gpiod;
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struct clk *clk;
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bool is_mux;
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int ret;
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num_parents = of_clk_get_parent_count(node);
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if (num_parents) {
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parent_names = devm_kcalloc(&pdev->dev, num_parents,
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sizeof(char *), GFP_KERNEL);
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if (!parent_names)
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return -ENOMEM;
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of_clk_parent_fill(node, parent_names, num_parents);
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} else {
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parent_names = NULL;
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}
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is_mux = of_device_is_compatible(node, "gpio-mux-clock");
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gpio_name = is_mux ? "select" : "enable";
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gpiod = devm_gpiod_get(&pdev->dev, gpio_name, GPIOD_OUT_LOW);
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if (IS_ERR(gpiod)) {
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ret = PTR_ERR(gpiod);
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if (ret == -EPROBE_DEFER)
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pr_debug("%s: %s: GPIOs not yet available, retry later\n",
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node->name, __func__);
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else
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pr_err("%s: %s: Can't get '%s' named GPIO property\n",
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node->name, __func__,
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gpio_name);
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return ret;
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}
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if (is_mux)
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clk = clk_register_gpio_mux(&pdev->dev, node->name,
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parent_names, num_parents, gpiod, 0);
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else
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clk = clk_register_gpio_gate(&pdev->dev, node->name,
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parent_names ? parent_names[0] : NULL, gpiod,
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CLK_SET_RATE_PARENT);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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return of_clk_add_provider(node, of_clk_src_simple_get, clk);
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}
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static const struct of_device_id gpio_clk_match_table[] = {
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{ .compatible = "gpio-mux-clock" },
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{ .compatible = "gpio-gate-clock" },
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{ }
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};
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static struct platform_driver gpio_clk_driver = {
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.probe = gpio_clk_driver_probe,
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.driver = {
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.name = "gpio-clk",
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.of_match_table = gpio_clk_match_table,
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},
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};
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builtin_platform_driver(gpio_clk_driver);
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