arm64: dts: rockchip: use BCLK to GPIO switch on rk3399

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We discoverd that the state of BCLK on, LRCLK off and SD_MODE on
may cause the speaker melting issue. Removing LRCLK while BCLK
is present can cause unexpected output behavior including a large
DC output voltage as described in the Max98357a datasheet.

In order to:
  1. prevent BCLK from turning on by other component.
  2. keep BCLK and LRCLK being present at the same time

This patch adjusts the device tree to allow BCLK to switch
to GPIO func before LRCLK output, and switch back during
LRCLK is output.

Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Link: https://lore.kernel.org/r/20220708080726.4170711-1-judyhsiao@chromium.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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This commit is contained in:

Judy Hsiao 2022-07-08 08:07:26 +00:00 • committed by Heiko Stuebner

parent 03d86fb5a5

commit 91419ae042

2 changed files with 34 additions and 1 deletions

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arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet.dtsi

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arch/arm64/boot/dts/rockchip/rk3399.dtsi

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