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Date:   Fri, 25 Oct 2019 20:45:45 +0200
From:   Marco Felsch <m.felsch@pengutronix.de>
To:     Joris Offouga <offougajoris@gmail.com>
Cc:     linux-arm-kernel@lists.infradead.org,
        Mark Rutland <mark.rutland@arm.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Otavio Salvador <otavio@ossystems.com.br>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        open list <linux-kernel@vger.kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        NXP Linux Team <linux-imx@nxp.com>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>
Subject: Re: [PATCH] ARM: dts: imx7d-pico: Add LCD support
Message-ID: <20191025184544.7gwwbsrketjtwrwi@pengutronix.de>
References: <20191025082247.3371-1-offougajoris@gmail.com>
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Hi Joris,

On 19-10-25 10:22, Joris Offouga wrote:
> Add support for the VXT VL050-8048NT-C01 panel connected through
> the 24 bit parallel LCDIF interface.
> 
> Signed-off-by: Joris Offouga <offougajoris@gmail.com>
> Signed-off-by: Fabio Estevam <festevam@gmail.com>
> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
> ---
>  arch/arm/boot/dts/imx7d-pico.dtsi | 84 +++++++++++++++++++++++++++++++
>  1 file changed, 84 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx7d-pico.dtsi b/arch/arm/boot/dts/imx7d-pico.dtsi
> index 6f50ebf31a0a..9042b1e6f1db 100644
> --- a/arch/arm/boot/dts/imx7d-pico.dtsi
> +++ b/arch/arm/boot/dts/imx7d-pico.dtsi
> @@ -69,6 +69,37 @@
>  		clocks = <&clks IMX7D_CLKO2_ROOT_DIV>;
>  		clock-names = "ext_clock";
>  	};
> +
> +	backlight: backlight {
> +		compatible = "pwm-backlight";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_backlight>;
> +		pwms = <&pwm4 0 50000 0>;
                                      ^
     If not inverted please drop the this flag.
Also you need to add

&pwm4 {
	status = "okay";
};

And so you can do the pwm pinctrl within that node, see below.

> +		brightness-levels = <0 36 72 108 144 180 216 255>;
> +		default-brightness-level = <6>;
> +		status = "okay";

status can be dropped too.

> +	};
> +
> +	reg_lcd_3v3: regulator-lcd-3v3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "lcd-3v3";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		gpio = <&gpio1 6 GPIO_ACTIVE_HIGH>;

Missing the muxing?

> +		enable-active-high;
> +	};
> +
> +	panel {
> +		compatible = "vxt,vl050-8048nt-c01";
> +		backlight = <&backlight>;
> +		power-supply = <&reg_lcd_3v3>;
> +
> +		port {
> +			panel_in: endpoint {
> +				remote-endpoint = <&display_out>;
> +			};
> +		};
> +	};

Please sort the nodes alphabetical.

>  };
>  
>  &clks {
> @@ -230,6 +261,18 @@
>  	};
>  };
>  
> +&lcdif {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_lcdif>;
> +	status = "okay";
> +
> +	port {
> +		display_out: endpoint {
> +			remote-endpoint = <&panel_in>;
> +		};
> +	};
> +};
> +
>  &sai1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_sai1>;
> @@ -349,6 +392,13 @@
>  };
>  
>  &iomuxc {
> +
> +	pinctrl_backlight: backlight {
                                    ^
                        please add 'grp'
> +		fsl,pins = <
> +			MX7D_PAD_GPIO1_IO11__PWM4_OUT		0x0
> +		>;
> +	};

IMHO the muxing is part of the pwm4 node. So rename it to
'pinctrl_pwm4: pwm4grp'.

Regards,
  Marco

> +
>  	pinctrl_ecspi3: ecspi3grp {
>  		fsl,pins = <
>  			MX7D_PAD_I2C1_SCL__ECSPI3_MISO		0x2
> @@ -413,6 +463,40 @@
>  		>;
>  	};
>  
> +	pinctrl_lcdif: lcdifgrp {
> +		fsl,pins = <
> +			MX7D_PAD_LCD_DATA00__LCD_DATA0		0x79
> +			MX7D_PAD_LCD_DATA01__LCD_DATA1		0x79
> +			MX7D_PAD_LCD_DATA02__LCD_DATA2		0x79
> +			MX7D_PAD_LCD_DATA03__LCD_DATA3		0x79
> +			MX7D_PAD_LCD_DATA04__LCD_DATA4		0x79
> +			MX7D_PAD_LCD_DATA05__LCD_DATA5		0x79
> +			MX7D_PAD_LCD_DATA06__LCD_DATA6		0x79
> +			MX7D_PAD_LCD_DATA07__LCD_DATA7		0x79
> +			MX7D_PAD_LCD_DATA08__LCD_DATA8		0x79
> +			MX7D_PAD_LCD_DATA09__LCD_DATA9		0x79
> +			MX7D_PAD_LCD_DATA10__LCD_DATA10		0x79
> +			MX7D_PAD_LCD_DATA11__LCD_DATA11		0x79
> +			MX7D_PAD_LCD_DATA12__LCD_DATA12		0x79
> +			MX7D_PAD_LCD_DATA13__LCD_DATA13		0x79
> +			MX7D_PAD_LCD_DATA14__LCD_DATA14		0x79
> +			MX7D_PAD_LCD_DATA15__LCD_DATA15		0x79
> +			MX7D_PAD_LCD_DATA16__LCD_DATA16		0x79
> +			MX7D_PAD_LCD_DATA17__LCD_DATA17		0x79
> +			MX7D_PAD_LCD_DATA18__LCD_DATA18		0x79
> +			MX7D_PAD_LCD_DATA19__LCD_DATA19		0x79
> +			MX7D_PAD_LCD_DATA20__LCD_DATA20		0x79
> +			MX7D_PAD_LCD_DATA21__LCD_DATA21		0x79
> +			MX7D_PAD_LCD_DATA22__LCD_DATA22		0x79
> +			MX7D_PAD_LCD_DATA23__LCD_DATA23		0x79
> +			MX7D_PAD_LCD_CLK__LCD_CLK		0x79
> +			MX7D_PAD_LCD_ENABLE__LCD_ENABLE		0x78
> +			MX7D_PAD_LCD_VSYNC__LCD_VSYNC		0x78
> +			MX7D_PAD_LCD_HSYNC__LCD_HSYNC		0x78
> +			MX7D_PAD_LCD_RESET__GPIO3_IO4		0x14
> +		>;
> +	};
> +
>  	pinctrl_pwm1: pwm1 {
>  		fsl,pins = <
>  			MX7D_PAD_GPIO1_IO08__PWM1_OUT   0x7f
> -- 
> 2.17.1
> 
> 
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