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Subject[PATCH] arm64: dts: rockchip: fix input enable pinconf on rk3399
Date
When the input enable pinconf was introduced, a default drive-strength
value of 2 was set for the pull up/down configs. However, this parameter
is unneeded when configuring the pin as input, and having a single
hardcoded value here is actually harmful: GPIOs on the RK3399 have
various same drive-strength capabilities depending on the bank and port
they belong to.

As an example, trying to configure the GPIO4_PD3 pin as an input with
pull-up enabled fails with the following output:

[ 10.706542] rockchip-pinctrl pinctrl: unsupported driver strength 2
[ 10.713661] rockchip-pinctrl pinctrl: pin_config_set op failed for pin 155

(acceptable drive-strength values for this pin being 3, 6, 9 and 12)

Let's drop the drive-strength property from all input pinconfs in order
to solve this issue.

Fixes: ec48c3e82ca3 ("arm64: dts: rockchip: add an input enable pinconf to rk3399")
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
---
arch/arm64/boot/dts/rockchip/rk3399.dtsi | 2 --
1 file changed, 2 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index 92c2207e686c..59858f2dc8b9 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -2221,13 +2221,11 @@ pcfg_input_enable: pcfg-input-enable {
pcfg_input_pull_up: pcfg-input-pull-up {
input-enable;
bias-pull-up;
- drive-strength = <2>;
};

pcfg_input_pull_down: pcfg-input-pull-down {
input-enable;
bias-pull-down;
- drive-strength = <2>;
};

clock {
--
2.35.1
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