linux-kernel - [PATCH v2 0/2] Add regmap support to exynos-pmu for protected PMU regs

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Date: Mon, 29 Jan 2024 21:19:10 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: arnd@...db.de,
	krzysztof.kozlowski@...aro.org,
	linux@...ck-us.net,
	wim@...ux-watchdog.org,
	alim.akhtar@...sung.com,
	jaewon02.kim@...sung.com,
	semen.protsenko@...aro.org
Cc: kernel-team@...roid.com,
	peter.griffin@...aro.org,
	tudor.ambarus@...aro.org,
	andre.draszik@...aro.org,
	saravanak@...gle.com,
	willmcvicker@...gle.com,
	linux-fsd@...la.com,
	linux-watchdog@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Subject: [PATCH v2 0/2]  Add regmap support to exynos-pmu for protected PMU regs

Hi folks,

This is a v2 of the series to add support for protected PMU registers found
on gs101 and derivative SoCs. In v2 it has been re-worked to be based on a
regmap abstraction that I think leads to a much neater overall solution.
The advantage of the regmap abstraction is that most leaf drivers that
read/write PMU registers need minimal changes.

Example of Exynos drivers that require PMU register access are:
* watchdog
* usb phy
* mipi phy
* ufs phy

This series has been tested on Pixel 6 / gs101. If the various maintainers/
contributors of other Exynos SoCs like exynos850, exynosautov9 etc can test
these patches on your respective systems that would be most appreciated!

The expectation is this series would be merged via Krzysztofs Samsung Exynos
tree.

regards,

Peter

Changes since v1:
 - Refactor to use custom regmap to abstract SMC register access (Sam / Guenter)
 - Add deferred probing support (Saravana / Krzysztof)

v1 lore: https://lore.kernel.org/all/20240122225710.1952066-1-peter.griffin@linaro.org/

Peter Griffin (2):
  soc: samsung: exynos-pmu: Add regmap support for SoCs that protect PMU
    regs
  watchdog: s3c2410_wdt: use exynos_get_pmu_regmap_by_phandle() for PMU
    regs

 drivers/soc/samsung/exynos-pmu.c       | 227 ++++++++++++++++++++++++-
 drivers/watchdog/Kconfig               |   1 -
 drivers/watchdog/s3c2410_wdt.c         |   9 +-
 include/linux/soc/samsung/exynos-pmu.h |  10 ++
 4 files changed, 241 insertions(+), 6 deletions(-)

-- 
2.43.0.429.g432eaa2c6b-goog