[v3,0/2] Add regmap support to exynos-pmu for protected PMU regs

Message

Peter Griffin Feb. 2, 2024, 2:57 p.m. UTC

Hi folks,

This is a v3 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 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, exynos5422
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 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 superflous 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)

v2 lore: https://lore.kernel.org/lkml/[e-mail]/
v1 lore: https://lore.kernel.org/all/[e-mail]/

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/Kconfig            |   1 +
 drivers/soc/samsung/exynos-pmu.c       | 233 ++++++++++++++++++++++++-
 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, 245 insertions(+), 10 deletions(-)