linux-dev/drivers/clk/at91/clk-system.c, branch linus/master

clk: at91: re-factor clocks suspend/resume

2021-10-27T01:27:41Z

SAMA5D2 and SAMA7G5 have a special power saving mode (backup mode) where most of the SoC's components are powered off (including PMC). Resuming from this mode is done with the help of bootloader. Peripherals are not aware of the power saving mode thus most of them are disabling clocks in proper suspend API and re-enable them in resume API without taking into account the previously setup rate. Moreover some of the peripherals are acting as wakeup sources and are not disabling the clocks in this scenario, when suspending. Since backup mode cuts the power for peripherals, in resume part these clocks needs to be re-configured. The initial PMC suspend/resume code was designed only for SAMA5D2's PMC (as it was the only one supporting backup mode). SAMA7G supports also backup mode and its PMC is different (few new functionalities, different registers offsets, different offsets in registers for each functionalities). To address both SAMA5D2 and SAMA7G5 PMC add .save_context()/.resume_context() support to each clocks driver and call this from PMC driver. Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/20211011112719.3951784-2-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre Signed-off-by: Stephen Boyd

clk: at91: replace conditional operator with double logical not

2020-07-24T09:19:08Z

Replace conditional operator with double logical not as code may be simpler to read. Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/1595403506-8209-10-git-send-email-claudiu.beznea@microchip.com Signed-off-by: Stephen Boyd

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

clk: at91: move DT compatibility code to its own file

2018-10-17T17:45:39Z

Move all the DT backward compatibility code to its own file so it can be deleted later. Signed-off-by: Alexandre Belloni Signed-off-by: Stephen Boyd

clk: at91: allow clock registration from C code

2018-10-17T17:44:25Z

Remove static keyword to allow functions to be used from other units. Also move some struct and function declarations to pmc.h Signed-off-by: Alexandre Belloni [sboyd@kernel.org: Include pmc.h] Signed-off-by: Stephen Boyd

clk: at91: Migrate to clk_hw based registration and OF APIs

2016-09-15T00:40:31Z

Now that we have clk_hw based provider APIs to register clks, we can get rid of struct clk pointers in this driver, allowing us to move closer to a clear split of consumer and provider clk APIs. Signed-off-by: Stephen Boyd Acked-by: Alexandre Belloni Tested-by: Alexandre Belloni Acked-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: remove IRQ handling and use polling

2016-02-17T16:52:59Z

The AT91 clock drivers make use of IRQs to avoid polling when waiting for some clocks to be enabled. Unfortunately, this leads to a crash when those IRQs are threaded (which happens when using preempt-rt) because they are registered before thread creation is possible. Use polling on those clocks instead to avoid the problem. Acked-by: Stephen Boyd Signed-off-by: Alexandre Belloni

clk: at91: make use of syscon/regmap internally

2016-02-17T16:52:58Z

Use the regmap coming from syscon to access the registers instead of using pmc_read/pmc_write. This allows to avoid passing the at91_pmc structure to the child nodes of the PMC. The final benefit is to have each clock register itself instead of having to iterate over the children. Signed-off-by: Boris Brezillon Acked-by: Stephen Boyd Signed-off-by: Alexandre Belloni

clk: at91: system: don't try to free_irq when there is no IRQ

2015-09-16T22:22:22Z

In the error path of at91_clk_register_system(), sys->irq is freed unconditionally but it may not exist or be request at all. Signed-off-by: Alexandre Belloni Acked-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: do not leak resources

2015-07-02T16:51:50Z

Do not leak memory and free irqs in case of an error. Acked-by: Boris Brezillon Signed-off-by: David Dueck Signed-off-by: Stephen Boyd