[v5,0/2] Add regmap support to exynos-pmu for protected PMU regs

Message

Peter Griffin Feb. 19, 2024, 8:42 p.m. UTC

Hi folks,

This is a v5 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 Oriole / gs101 (by me), exynos850
(by Sam) and odroid xu3 (exynos 5422) by Alexey. That confirms that both
the regmap mmio parts and regmap SMC parts are working correctly.

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

regards,

Peter

Changes since v4:
 - Use same argument names as in struct regmap_config
 - Remove inline keyword and rely on compiler
 - Update kerneldoc wording
 - property -> propname argument rename
 - reverse Xmas tree
 - Only call of_node_put() when of_parse_phandle() is called
 - Collect tags

Changes since v3:
 - Fix PMUALIVE_MASK
 - 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 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)

v4 lore: https://lore.kernel.org/all/[e-mail]/
v3 lore: https://lore.kernel.org/all/[e-mail]/
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       | 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, 249 insertions(+), 8 deletions(-)