linux-kernel - Re: [PATCH 05/15] arm64: dts: imx8mp-evk: enable uart1/3 ports

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Date:   Thu, 20 Oct 2022 13:07:23 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de,
        devicetree@...r.kernel.org, Peng Fan <peng.fan@....com>,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 05/15] arm64: dts: imx8mp-evk: enable uart1/3 ports

Hi Peng,

On 22-10-20, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Enable uart1/3 ports for evk board.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 36 ++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> index 2e29bb3c041c..366f709f8790 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> @@ -428,6 +428,15 @@ &snvs_pwrkey {
>  	status = "okay";
>  };
>  
> +&uart1 { /* BT */
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_uart1>;
> +	assigned-clocks = <&clk IMX8MP_CLK_UART1>;
> +	assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_80M>;

I'm curious, what is the default parent and why is this wrong? For the
already exisiting uart2 we don't do that. Same applies for uart3.

Regards,
  Marco


> +	fsl,uart-has-rtscts;
> +	status = "okay";
> +};
> +
>  &uart2 {
>  	/* console */
>  	pinctrl-names = "default";
> @@ -450,6 +459,15 @@ &usb_dwc3_1 {
>  	status = "okay";
>  };
>  
> +&uart3 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_uart3>;
> +	assigned-clocks = <&clk IMX8MP_CLK_UART3>;
> +	assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_80M>;
> +	fsl,uart-has-rtscts;
> +	status = "okay";
> +};
> +
>  &usdhc2 {
>  	assigned-clocks = <&clk IMX8MP_CLK_USDHC2>;
>  	assigned-clock-rates = <400000000>;
> @@ -625,6 +643,15 @@ MX8MP_IOMUXC_SD2_RESET_B__GPIO2_IO19	0x40
>  		>;
>  	};
>  
> +	pinctrl_uart1: uart1grp {
> +		fsl,pins = <
> +			MX8MP_IOMUXC_UART1_RXD__UART1_DCE_RX	0x140
> +			MX8MP_IOMUXC_UART1_TXD__UART1_DCE_TX	0x140
> +			MX8MP_IOMUXC_UART3_RXD__UART1_DCE_CTS	0x140
> +			MX8MP_IOMUXC_UART3_TXD__UART1_DCE_RTS	0x140
> +		>;
> +	};
> +
>  	pinctrl_uart2: uart2grp {
>  		fsl,pins = <
>  			MX8MP_IOMUXC_UART2_RXD__UART2_DCE_RX	0x140
> @@ -638,6 +665,15 @@ MX8MP_IOMUXC_GPIO1_IO14__USB2_OTG_PWR	0x10
>  		>;
>  	};
>  
> +	pinctrl_uart3: uart3grp {
> +		fsl,pins = <
> +			MX8MP_IOMUXC_ECSPI1_SCLK__UART3_DCE_RX		0x140
> +			MX8MP_IOMUXC_ECSPI1_MOSI__UART3_DCE_TX		0x140
> +			MX8MP_IOMUXC_ECSPI1_SS0__UART3_DCE_RTS		0x140
> +			MX8MP_IOMUXC_ECSPI1_MISO__UART3_DCE_CTS		0x140
> +		>;
> +	};
> +
>  	pinctrl_usdhc2: usdhc2grp {
>  		fsl,pins = <
>  			MX8MP_IOMUXC_SD2_CLK__USDHC2_CLK	0x190
> -- 
> 2.37.1
> 
> 
>