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

clk: at91: pmc: add sama7g5 to the list of available pmcs

2021-10-27T01:27:42Z

Add SAMA7G5 to the list of available PMCs such that the suspend/resume code for clocks to be used on backup mode. Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/20211011112719.3951784-7-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre Signed-off-by: Stephen Boyd

clk: at91: pmc: execute suspend/resume only for backup mode

2021-10-27T01:27:42Z

Before going to backup mode architecture specific PM code sets the first word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()). Thus take this into account when suspending/resuming clocks. This will avoid executing unnecessary instructions when suspending to non backup modes. Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/20211011112719.3951784-3-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre Signed-off-by: Stephen Boyd

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: check pmc node status before registering syscore ops

2021-10-08T03:47:47Z

Currently, at91 pmc driver always register the syscore_ops whatever the status of the pmc node that has been found. When set as secure and disabled, the pmc should not be accessed or this will generate abort exceptions. To avoid this, add a check on node availability before registering the syscore operations. Signed-off-by: Clément Léger Link: https://lore.kernel.org/r/20210913082633.110168-1-clement.leger@bootlin.com Acked-by: Nicolas Ferre Reviewed-by: Claudiu Beznea Fixes: b3b02eac33ed ("clk: at91: Add sama5d2 suspend/resume") Signed-off-by: Stephen Boyd

clk: at91: allow setting PCKx parent via DT

2020-05-27T03:22:43Z

This exposes PROGx clocks for use in assigned-clocks DeviceTree property for selecting PCKx parent clock. Signed-off-by: Michał Mirosław Link: https://lkml.kernel.org/r/0054532c00163ddf405dad658b32f0d7d97fcc8e.1588630999.git.mirq-linux@rere.qmqm.pl Acked-by: Alexandre Belloni Signed-off-by: Stephen Boyd

clk: at91: optimize pmc data allocation

2020-05-27T03:22:34Z

Alloc whole data structure in one block. This makes the code shorter, more efficient and easier to extend in following patch. Signed-off-by: Michał Mirosław Link: https://lkml.kernel.org/r/fc6f6d67b8cee0beace4a9d9cca7431e5efa769d.1588630999.git.mirq-linux@rere.qmqm.pl Acked-by: Alexandre Belloni Signed-off-by: Stephen Boyd

clk: at91: pmc: decrement node's refcount

2020-05-27T03:22:02Z

of_find_matching_node() increment node's refcount. Call of_node_put() to decrement it after it was used. Signed-off-by: Claudiu Beznea Link: https://lkml.kernel.org/r/1588508289-10140-2-git-send-email-claudiu.beznea@microchip.com Signed-off-by: Stephen Boyd

clk: at91: pmc: do not continue if compatible not located

2020-05-27T03:22:02Z

pmc_register_ops() is called for all AT91 devices. Return -ENODEV in case of_find_matching_node() returns NULL. Signed-off-by: Claudiu Beznea Link: https://lkml.kernel.org/r/1588508289-10140-1-git-send-email-claudiu.beznea@microchip.com Signed-off-by: Stephen Boyd

clk: at91: fix possible deadlock

2019-12-16T17:56:18Z

Lockdep warns about a possible circular locking dependency because using syscon_node_to_regmap() will make the created regmap get and enable the first clock it can parse from the device tree. This clock is not needed to access the registers and should not be enabled at that time. Use the recently introduced device_node_to_regmap to solve that as it looks up the regmap in the same list but doesn't care about the clocks. Reported-by: Michał Mirosław Signed-off-by: Alexandre Belloni Link: https://lkml.kernel.org/r/20191128102531.817549-1-alexandre.belloni@bootlin.com Tested-by: Michał Mirosław 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