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Message-ID: <20200104213332.GA19211@bogus>
Date:   Sat, 4 Jan 2020 14:33:32 -0700
From:   Rob Herring <robh@...nel.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     aisheng.dong@....com, festevam@...il.com, shawnguo@...nel.org,
        stefan@...er.ch, kernel@...gutronix.de, linus.walleij@...aro.org,
        mark.rutland@....com, s.hauer@...gutronix.de,
        catalin.marinas@....com, will@...nel.org,
        bjorn.andersson@...aro.org, olof@...om.net, maxime@...no.tech,
        leonard.crestez@....com, dinguyen@...nel.org,
        marcin.juszkiewicz@...aro.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH V2 1/3] dt-bindings: imx: Add pinctrl binding doc for
 i.MX8MP

On Thu, Dec 26, 2019 at 02:45:41PM +0800, Anson Huang wrote:
> Add binding doc for i.MX8MP pinctrl driver.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> No changes.
> ---
>  .../bindings/pinctrl/fsl,imx8mp-pinctrl.txt        |  38 +

Please make this a DT schema.

>  arch/arm64/boot/dts/freescale/imx8mp-pinfunc.h     | 931 +++++++++++++++++++++
>  2 files changed, 969 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/fsl,imx8mp-pinctrl.txt
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-pinfunc.h
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/fsl,imx8mp-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/fsl,imx8mp-pinctrl.txt
> new file mode 100644
> index 0000000..619104b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/fsl,imx8mp-pinctrl.txt
> @@ -0,0 +1,38 @@
> +* Freescale IMX8MP IOMUX Controller
> +
> +Please refer to fsl,imx-pinctrl.txt and pinctrl-bindings.txt in this directory
> +for common binding part and usage.
> +
> +Required properties:
> +- compatible: "fsl,imx8mp-iomuxc"
> +- reg: should contain the base physical address and size of the iomuxc
> +  registers.
> +
> +Required properties in sub-nodes:
> +- fsl,pins: each entry consists of 6 integers and represents the mux and config
> +  setting for one pin.  The first 5 integers <mux_reg conf_reg input_reg mux_val
> +  input_val> are specified using a PIN_FUNC_ID macro, which can be found in
> +  <arch/arm64/boot/dts/freescale/imx8mp-pinfunc.h>. The last integer CONFIG is
> +  the pad setting value like pull-up on this pin. Please refer to i.MX8M Plus
> +  Reference Manual for detailed CONFIG settings.
> +
> +Examples:
> +
> +&uart1 {
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&pinctrl_uart1>;
> +};
> +
> +iomuxc: pinctrl@...30000 {
> +        compatible = "fsl,imx8mp-iomuxc";
> +        reg = <0x30330000 0x10000>;
> +
> +	pinctrl_uart1: uart1grp {

In particular, define some node naming pattern that you can match on. 
Perhaps "grp$" works.

> +		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
> +		>;
> +	};
> +};

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