clk: samsung: gs101: add support for cmu_peric1

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CMU_PERIC1 is the clock management unit used for the peric1 block which
is used for additional USI, I3C and PWM interfaces/busses. Add support
for muxes, dividers and gates of cmu_peric1, except for
CLK_GOUT_PERIC1_IP which isn't well described in the datasheet and
which downstream also ignores (similar to cmu_peric0).

Two clocks have been marked as CLK_IS_CRITICAL for the following
reason:
    * disabling them makes it impossible to access any peric1
      registers, (including those two registers).
    * disabling gout_peric1_lhm_axi_p_peric1_i_clk sometimes has the
      additional effect of making the whole system unresponsive.

One clock marked as CLK_IGNORE_UNUSED needs to be kept on until we have
updated the respective driver for the following reason:
    * gout_peric1_gpio_peric1_pclk is required by the pinctrl
      configuration. With this clock disabled, reconfiguring the pins
      (for USI/I2C, USI/UART) will hang during register access.
      Since pinctrl-samsung doesn't support a clock at the moment, we
      just keep the kernel from disabling it at boot, until we have an
      update for pinctrl-samsung, at which point we'll drop the flag.

Signed-off-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20240201161258.1013664-4-andre.draszik@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

...

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André Draszik 2024-02-01 16:11:39 +00:00 • committed by Krzysztof Kozlowski

parent 3ab1d817c3

commit 2999e786d7

1 changed files with 346 additions and 0 deletions

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drivers/clk/samsung/clk-gs101.c

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