arm64: dts: qcom: sa8540p-ride: enable rtc

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SA8540P-ride is one of the Qualcomm platforms that does not have access
to UEFI runtime services and on which the RTC registers are read-only,
as described in:
https://lore.kernel.org/all/20230202155448.6715-1-johan+linaro@kernel.org/

Reserve four bytes in one of the PMIC registers to hold the RTC offset
the same way as it was done for sc8280xp-crd which has similar
limitations:
    commit e67b45582c ("arm64: dts: qcom: sc8280xp-crd: enable rtc")

On SA8540P-ride, the register bank SDAM6 of the first PMIC is not
writable. Following recommendations provided during the review, use
SDAM2 from the second PMIC at offset 0xa0 instead.

Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Eric Chanudet <echanude@redhat.com>
Link: https://lore.kernel.org/r/20230809203506.1833205-1-echanude@redhat.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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This commit is contained in:

Eric Chanudet 2023-08-09 16:32:33 -04:00 • committed by Bjorn Andersson

parent 605a981e53

commit e85cbb34f3

2 changed files with 25 additions and 1 deletions

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11

arch/arm64/boot/dts/qcom/sa8540p-pmics.dtsi

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15

arch/arm64/boot/dts/qcom/sa8540p-ride.dts

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