kernel.git/include/linux/clk.h, branch linux-4.19.y

clk: Provide new devm_clk helpers for prepared and enabled clocks

2024-11-08T15:19:18Z

[ Upstream commit 7ef9651e9792b08eb310c6beb202cbc947f43cab ] When a driver keeps a clock prepared (or enabled) during the whole lifetime of the driver, these helpers allow to simplify the drivers. Reviewed-by: Jonathan Cameron Reviewed-by: Alexandru Ardelean Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20220520075737.758761-4-u.kleine-koenig@pengutronix.de Signed-off-by: Stephen Boyd Stable-dep-of: a6191a3d1811 ("gpio: aspeed: Use devm_clk api to manage clock source") Signed-off-by: Sasha Levin

clk: Add (devm_)clk_get_optional() functions

2024-11-08T15:19:18Z

[ Upstream commit 60b8f0ddf1a927ef02141a6610fd52575134f821 ] This adds clk_get_optional() and devm_clk_get_optional() functions to get optional clocks. They behave the same as (devm_)clk_get() except where there is no clock producer. In this case, instead of returning -ENOENT, the function returns NULL. This makes error checking simpler and allows clk_prepare_enable, etc to be called on the returned reference without additional checks. Signed-off-by: Phil Edworthy Reviewed-by: Andy Shevchenko Cc: Russell King [sboyd@kernel.org: Document in devres.txt] Signed-off-by: Stephen Boyd Stable-dep-of: a6191a3d1811 ("gpio: aspeed: Use devm_clk api to manage clock source") Signed-off-by: Sasha Levin

clk: Fix undefined reference to `clk_rate_exclusive_{get,put}'

2023-08-30T14:31:56Z

[ Upstream commit 2746f13f6f1df7999001d6595b16f789ecc28ad1 ] The COMMON_CLK config is not enabled in some of the architectures. This causes below build issues: pwm-rz-mtu3.c:(.text+0x114): undefined reference to `clk_rate_exclusive_put' pwm-rz-mtu3.c:(.text+0x32c): undefined reference to `clk_rate_exclusive_get' Fix these issues by moving clk_rate_exclusive_{get,put} inside COMMON_CLK code block, as clk.c is enabled by COMMON_CLK. Fixes: 55e9b8b7b806 ("clk: add clk_rate_exclusive api") Reported-by: kernel test robot Closes: https://lore.kernel.org/all/202307251752.vLfmmhYm-lkp@intel.com/ Signed-off-by: Biju Das Link: https://lore.kernel.org/r/20230725175140.361479-1-biju.das.jz@bp.renesas.com Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin

clk: add duty cycle support

2018-06-19T17:06:29Z

Add the possibility to apply and query the clock signal duty cycle ratio. This is useful when the duty cycle of the clock signal depends on some other parameters controlled by the clock framework. For example, the duty cycle of a divider may depends on the raw divider setting (ratio = N / div) , which is controlled by the CCF. In such case, going through the pwm framework to control the duty cycle ratio of this clock would be a burden. A clock provider is not required to implement the operation to set and get the duty cycle. If it does not implement .get_duty_cycle(), the ratio is assumed to be 50%. This change also adds a new flag, CLK_DUTY_CYCLE_PARENT. This flag should be used to indicate that a clock, such as gates and muxes, may inherit the duty cycle ratio of its parent clock. If a clock does not provide a get_duty_cycle() callback and has CLK_DUTY_CYCLE_PARENT, then the call will be directly forwarded to its parent clock, if any. For set_duty_cycle(), the clock should also have CLK_SET_RATE_PARENT for the call to be forwarded Signed-off-by: Jerome Brunet Signed-off-by: Michael Turquette Link: lkml.kernel.org/r/20180619144141.8506-1-jbrunet@baylibre.com

clk: add more __must_check for bulk APIs

2018-03-16T22:45:51Z

we need it even when !CONFIG_HAVE_CLK because it allows us to catch missing checking return values in the non-clk compile configurations too. More test coverage. Cc: Stephen Boyd Suggested-by: Stephen Boyd Signed-off-by: Dong Aisheng Signed-off-by: Stephen Boyd

clk: add clk_rate_exclusive api

2017-12-20T00:35:34Z

Using clock rate protection, we can now provide a way for clock consumer to claim exclusive control over the rate of a producer So far, rate change operations have been a "last write wins" affair. This changes allows drivers to explicitly protect against this behavior, if required. Of course, if exclusivity over a producer is claimed more than once, the rate is effectively locked as exclusivity cannot be preempted Tested-by: Maxime Ripard Acked-by: Michael Turquette Signed-off-by: Jerome Brunet Signed-off-by: Michael Turquette Link: lkml.kernel.org/r/20171201215200.23523-10-jbrunet@baylibre.com

Merge tag 'clk-bulk-get-prep-enable' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

2017-07-14T19:37:41Z

Pull clk api update from Stephen Boyd: "Small patch to add the clk_bulk_prepare_enable() and clk_bulk_disable_unprepare() API to the newly introduced clk bulk APIs. It would be good to get this into the -rc1 so that other driver trees can use it for code targeted for the next merge window" * tag 'clk-bulk-get-prep-enable' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: clk: Provide bulk prepare_enable disable_unprepare variants

clk: Provide bulk prepare_enable disable_unprepare variants

2017-07-13T06:50:53Z

This extends the existing set of bulk helpers with prepare_enable and disable_unprepare variants. Cc: Russell King , Cc: Dong Aisheng Signed-off-by: Bjorn Andersson Signed-off-by: Stephen Boyd

Merge branch 'clk-bulk-get' into clk-next

2017-06-02T22:39:32Z

* clk-bulk-get: clk: add managed version of clk_bulk_get clk: add clk_bulk_get accessories

clk: add managed version of clk_bulk_get

2017-06-02T22:37:49Z

This patch introduces the managed version of clk_bulk_get. Cc: Michael Turquette Cc: Stephen Boyd Cc: Russell King Cc: Geert Uytterhoeven Cc: "Rafael J. Wysocki" Cc: Viresh Kumar Cc: Mark Brown Cc: Shawn Guo Cc: Fabio Estevam Cc: Sascha Hauer Cc: Anson Huang Cc: Robin Gong Cc: Bai Ping Cc: Leonard Crestez Cc: Octavian Purdila Signed-off-by: Dong Aisheng Signed-off-by: Stephen Boyd