linux-dev/drivers/clk/at91/clk-programmable.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: clk-programmable: add mux_table option

2020-07-24T09:19:08Z

Add mux table option. This is necessary for IP versions that has gaps in the range of available clock sources (e.g. SAMA7G5). Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/1595403506-8209-15-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: fix programmable clock for sama5d2

2019-03-18T19:50:31Z

The prescaler formula of the programmable clock has changed for sama5d2. Update the driver accordingly. Fixes: a2038077de9a ("clk: at91: add sama5d2 PMC driver") Cc: # v4.20+ Signed-off-by: Nicolas Ferre [nicolas.ferre@microchip.com: adapt the prescaler range, fix clk_programmable_recalc_rate, split patch] Signed-off-by: Matthias Wieloch Signed-off-by: Alexandre Belloni Signed-off-by: Stephen Boyd

clk: at91: programmable: remove unneeded register read

2019-02-25T17:23:45Z

This register read is a leftover of a previous read/modify/write. We now use regmap_update_bits(), so we don't need it anymore. Signed-off-by: Nicolas Ferre Signed-off-by: Alexandre Belloni Signed-off-by: Stephen Boyd

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: pmc: Support backup for programmable clocks

2017-12-22T00:34:06Z

When an AT91 programmable clock is declared in the device tree, register it into the Power Management Controller driver. On entering suspend mode, the driver saves and restores the Programmable Clock registers to support the backup mode for these clocks. Signed-off-by: Romain Izard Acked-by: Nicolas Ferre Acked-by: Alexandre Belloni Signed-off-by: Stephen Boyd

clk: at91: Fix a return value in case of error

2016-10-20T23:37:56Z

If 'clk_hw_register()' fails, it is likely that we expect to return an error instead of a valid pointer (which would mean success). Fix commit f5644f10dcfb ("clk: at91: Migrate to clk_hw based registration and OF APIs") Signed-off-by: Christophe JAILLET 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