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| /linux/drivers/clk/samsung/ |
| H A D | clk-gs101.c | diff 2999e786d7e9596a0057d70098e339d59d7e72f9 Thu Feb 01 17:11:39 CET 2024 André Draszik <andre.draszik@linaro.org> clk: samsung: gs101: add support for cmu_peric1
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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