[PATCH v4 0/2] Add regmap support to exynos-pmu for protected PMU regs

From: Peter Griffin
Date: Thu Feb 08 2024 - 11:21:39 EST

Hi folks,

This is a v4 of the series to add support for protected PMU registers found
on gs101 and derivative SoCs. In v2 and later it was re-worked to be based
on a regmap abstraction that I think leads to a much neater overall

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, exynos5422
etc can test these patches on your respective systems that would be most

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



Changes since v3:
- Add TENSOR_ prefix
- clear SET_BITS bits on each loop iteration
- change set_bit to set_bits func name
- Fix some alignment
- Add missing return on dev_err_probe
- Reduce indentation in loop

Changes since v2
- Add select REGMAP to Kconfig
- Add constant for SET/CLEAR bits
- Replace kerneldoc with one line comment
- Fix kerneldoc for EXPORT_SYMBOL_GPL funcs
- remove superfluous extern keyword
- dev_err_probe() on probe error
- shorten regmcfg name
- no compatibles inside probe, use match data
- don't mix declarations with/without initializations
- tensor_sec_reg_read() use mmio to avoid access restrictions
- Collect up Reviewed-by
- const for regmap_config structs

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

v3 lore: https://lore.kernel.org/linux-arm-kernel/20240202145731.4082033-1-peter.griffin@xxxxxxxxxx/
v2 lore: https://lore.kernel.org/lkml/20240129211912.3068411-1-peter.griffin@xxxxxxxxxx/
v1 lore: https://lore.kernel.org/all/20240122225710.1952066-1-peter.griffin@xxxxxxxxxx/

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

drivers/soc/samsung/Kconfig | 1 +
drivers/soc/samsung/exynos-pmu.c | 235 ++++++++++++++++++++++++-
drivers/soc/samsung/exynos-pmu.h | 1 +
drivers/watchdog/Kconfig | 1 -
drivers/watchdog/s3c2410_wdt.c | 8 +-
include/linux/soc/samsung/exynos-pmu.h | 11 +-
6 files changed, 247 insertions(+), 10 deletions(-)