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9a34b45397
linux/drivers/clk
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Marek Szyprowski 9a34b45397 clk: Add support for runtime PM 
Registers for some clocks might be located in the SOC area, which are under the
power domain. To enable access to those registers respective domain has to be
turned on. Additionally, registers for such clocks will usually loose its
contents when power domain is turned off, so additional saving and restoring of
them might be needed in the clock controller driver.

This patch adds basic infrastructure in the clocks core to allow implementing
driver for such clocks under power domains. Clock provider can supply a
struct device pointer, which is the used by clock core for tracking and managing
clock's controller runtime pm state. Each clk_prepare() operation
will first call pm_runtime_get_sync() on the supplied device, while
clk_unprepare() will do pm_runtime_put_sync() at the end.

Additional calls to pm_runtime_get/put functions are required to ensure that any
register access (like calculating/changing clock rates and unpreparing/disabling
unused clocks on boot) will be done with clock controller in runtime resumend
state.

When one wants to register clock controller, which make use of this feature, he
has to:
1. Provide a struct device to the core when registering the provider.
2. Ensure to enable runtime PM for that device before registering clocks.
3. Make sure that the runtime PM status of the controller device reflects
   the HW state.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/1503302703-13801-2-git-send-email-m.szyprowski@samsung.com
2017-09-07 15:25:13 -07:00
..
at91 clk: at91: Add sama5d2 suspend/resume 2017-06-29 18:47:35 -07:00
axis clk: axis: Use new macro CLK_OF_DECLARE_DRIVER 2016-08-12 18:00:37 -07:00
axs10x clk/axs10x: Clear init field in driver probe 2017-01-09 16:06:40 -08:00
bcm clk: iproc: Remove __init marking on iproc_pll_clk_setup() 2017-06-21 09:12:57 -07:00
berlin clk: berlin: Pass correct type to hw provider registration 2016-11-16 11:04:17 -08:00
h8300 clk: h8300: Migrate to clk_hw based registration APIs 2016-08-24 17:37:10 -07:00
hisilicon clk: hisilicon: add usb2 clocks for hi3798cv200 SoC 2017-06-21 10:46:45 -07:00
imgtec clk: boston: Add a driver for MIPS Boston board clocks 2017-07-11 14:13:06 +02:00
imx clk: imx7d: create clocks behind rawnand clock gate 2017-06-19 19:02:41 -07:00
ingenic clk: ingenic: Allow divider value to be divided 2016-05-12 14:48:25 -07:00
keystone clk: keystone: TI_SCI_PROTOCOL is needed for clk driver 2017-06-22 17:39:25 -07:00
loongson1 CLK: Add Loongson1C clock support 2016-09-23 14:49:21 -07:00
mediatek clk: mediatek: export cpu multiplexer clock for MT8173 SoCs 2017-06-19 19:02:44 -07:00
meson * Expose more clock gate on meson8 (SAR ADC, RNG, USB, SDIO, ETH) 2017-06-16 15:01:46 -07:00
microchip clk: microchip: Initialize SOSC clock rate for PIC32MZDA. 2016-08-24 16:05:24 -07:00
mmp clk:mmp:clk-of-mmp2: Free memory and Unmap region obtained by kzalloc and of_iomap 2016-12-08 16:29:39 -08:00
mvebu clk: mvebu: cp110: Minor cleanups 2017-06-19 17:14:11 -07:00
mxs clk: mxs: Remove CLK_IS_ROOT 2016-03-02 17:44:59 -08:00
nxp clk: nxp: clk-lpc18xx-ccu: Unmap region obtained by of_iomap 2016-11-01 17:32:25 -07:00
pistachio
pxa ARM: SoC platform updates for v4.10 2016-12-15 15:39:02 -08:00
qcom clk: gcc-msm8916: add support to 9.6MHz codec clk 2017-06-19 17:43:49 -07:00
renesas clk: renesas: cpg-mssr: Use of_device_get_match_data() helper 2017-06-19 19:02:43 -07:00
rockchip clk: rockchip: mark some special clk as critical on rk3368 2017-06-02 15:57:32 +02:00
samsung clk: samsung: audss: Fix silent hang on Exynos4412 due to disabled EPLL 2017-06-22 14:55:35 -07:00
sirf clk: sirf: Remove CLK_IS_ROOT 2016-04-15 16:50:04 -07:00
socfpga clk: socfpga: Fix the smplsel on Arria10 and Stratix10 2017-06-19 17:01:55 -07:00
spear clk: spear: fix ADC clock definition on SPEAr600 2017-04-19 09:27:52 -07:00
st clk: st: clk-flexgen: Unmap region obtained by of_iomap 2016-12-08 16:35:22 -08:00
sunxi Allwinner clock changes for 4.10 2016-11-16 11:19:20 -08:00
sunxi-ng clk: sunxi-ng: Staticize ccu_mux_helper_unapply_prediv() 2017-06-16 14:51:36 -07:00
tegra clk: tegra: Don't reset PLL-CX if it is already enabled 2017-04-04 16:06:05 +02:00
ti clk: ti: omap4: add clkctrl clock data 2017-06-15 10:48:08 +03:00
uniphier clk: uniphier: provide NAND controller clock rate 2017-06-21 10:47:27 -07:00
ux500 clk: ux500: Convert ABx500 clocks to use OF probing 2017-01-26 16:10:02 -08:00
versatile clk: versatile: delete old RealView clock implementation 2017-06-02 16:27:17 -07:00
x86 clk: x86: pmc-atom: Checking for IS_ERR() instead of NULL 2017-05-01 11:13:25 -07:00
zte clk: zx296718: export I2S mux clocks 2017-06-19 19:02:42 -07:00
zynq clk: zynq: Remove CLK_IS_ROOT 2016-03-02 17:48:26 -08:00
clk-asm9260.c clk: asm9260: Migrate to clk_hw based registration and OF APIs 2016-08-24 16:08:33 -07:00
clk-axi-clkgen.c clk: axi-clkgen: Migrate to clk_hw based OF and registration APIs 2016-08-24 16:10:31 -07:00
clk-axm5516.c clk: axm5516: Migrate to clk_hw based OF and registration APIs 2016-08-24 16:11:07 -07:00
clk-bulk.c clk: add clk_bulk_get accessories 2017-06-02 15:37:45 -07:00
clk-cdce706.c clk: cdce: Migrate to clk_hw based OF and registration APIs 2016-08-24 16:12:38 -07:00
clk-cdce925.c clk: cdce925: add support for CDCE913, CDCE937, and CDCE949 2017-01-09 16:38:30 -08:00
clk-clps711x.c clk: clps711x: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:19:26 -07:00
clk-composite.c Merge branch 'clk-hw-register' (early part) into clk-next 2016-04-21 14:47:18 -07:00
clk-conf.c clk: Fix __set_clk_rates error print-string 2017-06-01 02:13:44 -07:00
clk-cs2000-cp.c clk: cs2000: select 12.20 High Accuracy on LFRatioCfg 2017-04-19 10:18:55 -07:00
clk-devres.c clk: add managed version of clk_bulk_get 2017-06-02 15:37:49 -07:00
clk-divider.c clk: divider: Make divider_round_rate take the parent clock 2017-06-07 15:32:12 +02:00
clk-efm32gg.c clk: efm32gg: Pass correct type to hw provider registration 2016-11-16 11:08:55 -08:00
clk-fixed-factor.c clk: fixed-factor: Remove export symbol on setup function 2016-08-15 15:08:03 -07:00
clk-fixed-rate.c clk: fixed-rate: Remove export symbol on setup function 2016-08-15 15:08:06 -07:00
clk-fractional-divider.c clk: fractional-divider: Add hw based registration APIs 2016-04-19 16:56:28 -07:00
clk-gate.c clk: gate: fix coding style 2016-11-09 12:05:50 -08:00
clk-gemini.c clk: gemini: Read status before using the value 2017-06-29 18:47:35 -07:00
clk-gpio.c clk: gpio: Add hw based registration APIs 2016-04-19 16:56:28 -07:00
clk-hi655x.c clk: hi6220: Add the hi655x's pmic clock 2017-04-21 19:18:53 -07:00
clk-highbank.c clk: highbank: Migrate to clk_hw based registration and OF APIs 2016-06-30 12:25:28 -07:00
clk-max77686.c clk: max77686: fix number of clocks setup for clk_hw based registration 2016-10-17 15:31:59 -07:00
clk-mb86s7x.c clk: mb86s7x: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:23:01 -07:00
clk-moxart.c clk: moxart: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:23:20 -07:00
clk-multiplier.c clk: multiplier: Prevent the multiplier from under / over flowing 2016-06-20 13:00:00 -07:00
clk-mux.c clk: mux: Add hw based registration APIs 2016-04-19 16:55:01 -07:00
clk-nomadik.c clk: nomadik: Delete error messages for a failed memory allocation in two functions 2017-04-21 19:47:14 -07:00
clk-nspire.c clk: nspire: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:23:21 -07:00
clk-oxnas.c clk: oxnas: Add OX820 Gate clocks 2016-10-23 10:18:45 -07:00
clk-palmas.c clk: palmas: undo preparation of a clock source. 2017-06-02 10:51:34 -07:00
clk-pwm.c clk: pwm: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:23:27 -07:00
clk-qoriq.c clk: qoriq: Separate root input clock for core PLLs on ls1012a 2017-06-01 01:24:13 -07:00
clk-rk808.c clk: rk808: Pass the right pointer as the get_hw context 2016-09-09 11:07:07 -07:00
clk-s2mps11.c clk: s2mps11: Migrate to clk_hw based OF and registration APIs 2016-06-30 12:29:14 -07:00
clk-scpi.c clk: scpi: error when clock fails to register 2017-06-29 18:47:35 -07:00
clk-si514.c clk: si514: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:29:59 -07:00
clk-si570.c clk: si570: Migrate to clk_hw based OF and registration APIs 2016-08-24 17:30:01 -07:00
clk-si5351.c clk: si5351: Delete an error message for a failed memory allocation in si5351_i2c_probe() 2017-04-21 19:44:54 -07:00
clk-si5351.h
clk-stm32f4.c clk: stm32f4: fix timeout management for pll and ready gate 2017-04-12 18:50:56 +02:00
clk-tango4.c clk: tango4: improve clkgen driver 2016-04-15 17:16:06 -07:00
clk-twl6040.c clk: twl6040: Migrate to clk_hw based registration APIs 2016-08-24 17:34:11 -07:00
clk-u300.c clk: u300: Migrate to clk_hw based registration APIs 2016-06-30 12:26:18 -07:00
clk-versaclock5.c clk: vc5: Add support for IDT VersaClock 5P49V5935 2017-04-19 09:08:59 -07:00
clk-vt8500.c clk: vt8500: Migrate to clk_hw based registration APIs 2016-08-24 17:35:48 -07:00
clk-wm831x.c clk: wm831x: fix usleep_range with bad range 2017-01-09 16:06:41 -08:00
clk-xgene.c clk: xgene: Don't call __pa on ioremaped address 2016-10-28 11:03:47 -07:00
clk.c clk: Add support for runtime PM 2017-09-07 15:25:13 -07:00
clk.h
clkdev.c ARM: 8631/1: clkdev: Detect errors in clk_hw_register_clkdev() for mass registration 2016-11-22 11:45:28 +00:00
Kconfig Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-07-15 10:59:54 -07:00
Makefile Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-07-15 10:59:54 -07:00