linux-kernel - Re: [PATCH 2/3] dt-bindings: display/bridge: Add binding for IMX NWL mipi dsi host controller

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Message-ID: <20190727015716.GA4902@pendragon.ideasonboard.com>
Date:   Sat, 27 Jul 2019 04:57:16 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Guido Günther <agx@...xcpu.org>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Lee Jones <lee.jones@...aro.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Robert Chiras <robert.chiras@....com>
Subject: Re: [PATCH 2/3] dt-bindings: display/bridge: Add binding for IMX NWL
 mipi dsi host controller

Hi Guido,

Thank you for the patch.

On Wed, Jul 24, 2019 at 05:52:25PM +0200, Guido Günther wrote:
> The Northwest Logic MIPI DSI IP core can be found in NXPs i.MX8 SoCs.
> 
> Signed-off-by: Guido Günther <agx@...xcpu.org>
> ---
>  .../bindings/display/bridge/imx-nwl-dsi.txt   | 89 +++++++++++++++++++
>  1 file changed, 89 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt b/Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt
> new file mode 100644
> index 000000000000..288fdb726d5a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt
> @@ -0,0 +1,89 @@
> +Northwest Logic MIPI-DSI on imx SoCs
> +=====================================

There's one too many =.

> +
> +NWL MIPI-DSI host controller found on i.MX8 platforms. This is a
> +dsi bridge for the for the NWL MIPI-DSI host.

s/dsi/DSI/
s/for the for the /for the /

> +
> +Required properties:
> +- compatible: 		"fsl,<chip>-nwl-dsi"
> +	The following strings are expected:
> +			"fsl,imx8mq-nwl-dsi"
> +- reg: 			the register range of the MIPI-DSI controller
> +- interrupts: 		the interrupt number for this module

It's not just a number but a specifier (with flags).

> +- clock, clock-names: 	phandles to the MIPI-DSI clocks

That should be phandles and names.

> +	The following clocks are expected on all platforms:

Expected or required ?

s/ on all platforms// as you only support a single platform.

> +		"core"    - DSI core clock
> +		"tx_esc"  - TX_ESC clock (used in escape mode)
> +		"rx_esc"  - RX_ESC clock (used in escape mode)
> +		"phy_ref" - PHY_REF clock. Clock is managed by the phy. Only
> +                            used to read the clock rate.
> +- assigned-clocks:	phandles to clocks that require initial configuration
> +- assigned-clock-rates:	rates of the clocks that require initial configuration
> +	The following clocks need to have an initial configuration:
> +	"tx_esc" (20 MHz) and "rx_esc" (80 Mhz).

I think those two properties are out of scope for these bindings.

> +- phys: 		phandle to the phy module representing the DPHY
> +			inside the MIPI-DSI IP block
> +- phy-names: 		should be "dphy"
> +
> +Optional properties:
> +- power-domains 	phandle to the power domain
> +- src			phandle to the system reset controller (required on
> +			i.MX8MQ)

Should this use the standard resets property ?

> +- mux-sel		phandle to the MUX register set (required on i.MX8MQ)
> +- assigned-clock-parents phandles to parent clocks that needs to be assigned as
> +			parents to clocks defined in assigned-clocks

This property is also out of scope.

> +
> +Example:
> +	mipi_dsi: mipi_dsi@...00000 {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		compatible = "fsl,imx8mq-nwl-dsi";
> +		reg = <0x30A00000 0x300>;
> +		clocks = <&clk IMX8MQ_CLK_DSI_CORE>,
> +			 <&clk IMX8MQ_CLK_DSI_AHB>,
> +			 <&clk IMX8MQ_CLK_DSI_IPG_DIV>,
> +			 <&clk IMX8MQ_CLK_DSI_PHY_REF>;
> +		clock-names = "core", "rx_esc", "tx_esc", "phy_ref";
> +		assigned-clocks = <&clk IMX8MQ_CLK_DSI_AHB>,
> +				  <&clk IMX8MQ_CLK_DSI_CORE>,
> +				  <&clk IMX8MQ_CLK_DSI_IPG_DIV>;
> +		assigned-clock-parents = <&clk IMX8MQ_SYS1_PLL_80M>,
> +					 <&clk IMX8MQ_SYS1_PLL_266M>;
> +		assigned-clock-rates = <80000000>,
> +				       <266000000>,
> +				       <20000000>;
> +		interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
> +		power-domains = <&pgc_mipi>;
> +		src = <&src>;
> +		mux-sel = <&iomuxc_gpr>;
> +		phys = <&dphy>;
> +		phy-names = "dphy";
> +		status = "okay";
> +
> +		panel@0 {
> +			compatible = "...";
> +			port {
> +			     panel_in: endpoint {
> +				       remote-endpoint = <&mipi_dsi_out>;
> +			     };
> +			};
> +		};
> +
> +		ports {
> +		      #address-cells = <1>;
> +		      #size-cells = <0>;
> +
> +		      port@0 {
> +			     reg = <0>;
> +			     mipi_dsi_in: endpoint {
> +					  remote-endpoint = <&dcss_disp0_mipi_dsi>;
> +			     };
> +		      };
> +		      port@1 {
> +			     reg = <1>;
> +			     mipi_dsi_out: endpoint {
> +					   remote-endpoint = <&panel_in>;
> +			     };
> +		      };
> +		};

The ports should be documented too. There are multiple example bindings
available.

> +	};

-- 
Regards,

Laurent Pinchart