linux-kernel - Re: [PATCH v8 6/8] MIPS: DTS: CI20: Add DT nodes for HDMI setup

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Date:   Tue, 23 Nov 2021 20:10:00 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Harry Wentland <harry.wentland@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime@...no.tech>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Paul Boddie <paul@...die.org.uk>, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        letux-kernel@...nphoenux.org, Jonas Karlman <jonas@...boo.se>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v8 6/8] MIPS: DTS: CI20: Add DT nodes for HDMI setup

Hi Nikolaus,

Le mar., nov. 23 2021 at 19:13:59 +0100, H. Nikolaus Schaller 
<hns@...delico.com> a écrit :
> From: Paul Boddie <paul@...die.org.uk>
> 
> We need to hook up
> * HDMI connector
> * HDMI power regulator
> * JZ4780_CLK_HDMI @ 27 MHz
> * DDC pinmux
> * HDMI and LCDC endpoint connections
> 
> Signed-off-by: Paul Boddie <paul@...die.org.uk>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  arch/mips/boot/dts/ingenic/ci20.dts | 83 
> +++++++++++++++++++++++++++--
>  1 file changed, 80 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/mips/boot/dts/ingenic/ci20.dts 
> b/arch/mips/boot/dts/ingenic/ci20.dts
> index b249a4f0f6b62..15cf03670693f 100644
> --- a/arch/mips/boot/dts/ingenic/ci20.dts
> +++ b/arch/mips/boot/dts/ingenic/ci20.dts
> @@ -78,6 +78,18 @@ eth0_power: fixedregulator@0 {
>  		enable-active-high;
>  	};
> 
> +	hdmi_out: connector {
> +		compatible = "hdmi-connector";
> +		label = "HDMI OUT";
> +		type = "a";
> +
> +		port {
> +			hdmi_con: endpoint {
> +				remote-endpoint = <&dw_hdmi_out>;
> +			};
> +		};
> +	};
> +
>  	ir: ir {
>  		compatible = "gpio-ir-receiver";
>  		gpios = <&gpe 3 GPIO_ACTIVE_LOW>;
> @@ -102,6 +114,17 @@ otg_power: fixedregulator@2 {
>  		gpio = <&gpf 14 GPIO_ACTIVE_LOW>;
>  		enable-active-high;
>  	};
> +
> +	hdmi_power: fixedregulator@3 {
> +		compatible = "regulator-fixed";
> +
> +		regulator-name = "hdmi_power";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +
> +		gpio = <&gpa 25 0>;
> +		enable-active-high;
> +	};
>  };
> 
>  &ext {
> @@ -114,11 +137,13 @@ &cgu {
>  	 * precision.
>  	 */
>  	assigned-clocks = <&cgu JZ4780_CLK_OTGPHY>, <&cgu JZ4780_CLK_RTC>,
> -			  <&cgu JZ4780_CLK_SSIPLL>, <&cgu JZ4780_CLK_SSI>;
> +			  <&cgu JZ4780_CLK_SSIPLL>, <&cgu JZ4780_CLK_SSI>,
> +			  <&cgu JZ4780_CLK_HDMI>;
>  	assigned-clock-parents = <0>, <&cgu JZ4780_CLK_RTCLK>,
>  				 <&cgu JZ4780_CLK_MPLL>,
> -				 <&cgu JZ4780_CLK_SSIPLL>;
> -	assigned-clock-rates = <48000000>, <0>, <54000000>;
> +				 <&cgu JZ4780_CLK_SSIPLL>,
> +				 <0>;

Nit - you can remove the last <0>, it will be the default.

> +	assigned-clock-rates = <48000000>, <0>, <54000000>, <0>, <27000000>;
>  };
> 
>  &tcu {
> @@ -509,6 +534,19 @@ pins_i2c4: i2c4 {
>  		bias-disable;
>  	};
> 
> +	pins_hdmi_ddc: hdmi_ddc {
> +		function = "hdmi-ddc";
> +		groups = "hdmi-ddc";
> +		bias-disable;
> +	};
> +
> +	/* switch to PF25 as gpio driving DDC_SDA low */
> +	pins_hdmi_ddc_unwedge: hdmi_ddc {
> +		function = "hdmi-ddc";
> +		groups = "hdmi-ddc";
> +		bias-disable;
> +	};

Your pins_hdmi_ddc and pins_hdmi_ddc_unwedge are the exact same? You 
could just use the former and pass it to both pinctrl-0 and pinctrl-1.

Cheers,
-Paul

> +
>  	pins_nemc: nemc {
>  		function = "nemc";
>  		groups = "nemc-data", "nemc-cle-ale", "nemc-rd-we", "nemc-frd-fwe";
> @@ -539,3 +577,42 @@ pins_mmc1: mmc1 {
>  		bias-disable;
>  	};
>  };
> +
> +&hdmi {
> +	status = "okay";
> +
> +	pinctrl-names = "default", "unwedge";
> +	pinctrl-0 = <&pins_hdmi_ddc>;
> +	pinctrl-1 = <&pins_hdmi_ddc_unwedge>;
> +
> +	hdmi-5v-supply = <&hdmi_power>;
> +
> +	ports {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		port@0 {
> +			reg = <0>;
> +			dw_hdmi_in: endpoint {
> +				remote-endpoint = <&lcd_out>;
> +			};
> +		};
> +
> +		port@1 {
> +			reg = <1>;
> +			dw_hdmi_out: endpoint {
> +				remote-endpoint = <&hdmi_con>;
> +			};
> +		};
> +	};
> +};
> +
> +&lcdc0 {
> +	status = "okay";
> +
> +	port {
> +		lcd_out: endpoint {
> +			remote-endpoint = <&dw_hdmi_in>;
> +		};
> +	};
> +};
> --
> 2.33.0
>