RE: [PATCH v3 3/4] arm64: dts: fix UART drive strength values as per FSD HW UM

[Alim Akhtar]

>-----Original Message-----
>From: Padmanabhan Rajanbabu [mailto:p.rajanbabu@xxxxxxxxxxx]
>Sent: Thursday, October 13, 2022 4:10 PM
>To: robh+dt@xxxxxxxxxx; krzysztof.kozlowski+dt@xxxxxxxxxx;
>alim.akhtar@xxxxxxxxxxx; chanho61.park@xxxxxxxxxxx;
>linus.walleij@xxxxxxxxxx; pankaj.dubey@xxxxxxxxxxx
>Cc: devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-
>samsung-soc@xxxxxxxxxxxxxxx; Padmanabhan Rajanbabu
><p.rajanbabu@xxxxxxxxxxx>
>Subject: [PATCH v3 3/4] arm64: dts: fix UART drive strength values as per FSD
>HW UM
>
>Drive strength values used for UART is not reflecting the default values
>recommended by FSD HW UM.
>
>Fix the drive strength values for UART, thereby ensuring that the existing
>device tree file is using default drive strength values recommended by UM for
>FSD SoC.
>
>Fixes: 684dac402f21 ("arm64: dts: fsd: Add initial pinctrl support")
>Signed-off-by: Padmanabhan Rajanbabu <p.rajanbabu@xxxxxxxxxxx>
>---

Reviewed-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>

> arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>b/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>index 09a492b1fd6e..a2634e70925a 100644
>--- a/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>+++ b/arch/arm64/boot/dts/tesla/fsd-pinctrl.dtsi
>@@ -309,14 +309,14 @@
> 		samsung,pins = "gpb7-0", "gpb7-1";
> 		samsung,pin-function = <FSD_PIN_FUNC_2>;
> 		samsung,pin-pud = <FSD_PIN_PULL_NONE>;
>-		samsung,pin-drv = <FSD_PIN_DRV_LV1>;
>+		samsung,pin-drv = <FSD_PIN_DRV_LV4>;
> 	};
>
> 	uart1_data: uart1-data-pins {
> 		samsung,pins = "gpb7-4", "gpb7-5";
> 		samsung,pin-function = <FSD_PIN_FUNC_2>;
> 		samsung,pin-pud = <FSD_PIN_PULL_NONE>;
>-		samsung,pin-drv = <FSD_PIN_DRV_LV1>;
>+		samsung,pin-drv = <FSD_PIN_DRV_LV4>;
> 	};
>
> 	spi0_bus: spi0-bus-pins {
>--
>2.17.1