arm64: dts: qcom: sa8775p-ride: move the reset-gpios property of the PHY

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Device-tree bindings for MDIO define per-PHY reset-gpios as well as a
global reset-gpios property at the MDIO node level which controls all
devices on the bus. The latter is most likely a workaround for the
chicken-and-egg problem where we cannot read the ID of the PHY before
bringing it out of reset but we cannot bring it out of reset until we've
read its ID.

I have proposed a comprehensive solution for this problem in 2020 but it
never got upstream. We do however have workaround in place which allows
us to hard-code the PHY id in the compatible property, thus skipping the
ID scanning.

Let's make the device-tree for sa8775p-ride slightly more correct by
moving the reset-gpios property to the PHY node with its ID put into the
PHY node's compatible.

Link: https://lore.kernel.org/all/20200622093744.13685-1-brgl@bgdev.pl/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230810080909.6259-5-brgl@bgdev.pl
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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Bartosz Golaszewski 2023-08-10 10:09:04 +02:00 • committed by Bjorn Andersson

parent 6ca89cc680

commit 5255901fb2

1 changed files with 4 additions and 4 deletions

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arch/arm64/boot/dts/qcom/sa8775p-ride.dts

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