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

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Date:   Fri, 14 Oct 2022 07:11:11 +0530
From:   "Alim Akhtar" <alim.akhtar@...sung.com>
To:     "'Padmanabhan Rajanbabu'" <p.rajanbabu@...sung.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <chanho61.park@...sung.com>, <linus.walleij@...aro.org>,
        <pankaj.dubey@...sung.com>
Cc:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-samsung-soc@...r.kernel.org>
Subject: RE: [PATCH v3 3/4] arm64: dts: fix UART drive strength values as
 per FSD HW UM



>-----Original Message-----
>From: Padmanabhan Rajanbabu [mailto:p.rajanbabu@...sung.com]
>Sent: Thursday, October 13, 2022 4:10 PM
>To: robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
>alim.akhtar@...sung.com; chanho61.park@...sung.com;
>linus.walleij@...aro.org; pankaj.dubey@...sung.com
>Cc: devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
>samsung-soc@...r.kernel.org; Padmanabhan Rajanbabu
><p.rajanbabu@...sung.com>
>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@...sung.com>
>---

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

> 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