Devicetree

* Re: [PATCH 2/3] dt-bindings: display/bridge: Add binding for IMX NWL mipi dsi host controller
From: Guido Günther @ 2019-07-31 14:37 UTC (permalink / raw)
  To: Laurent Pinchart
  Cc: David Airlie, Daniel Vetter, Rob Herring, Mark Rutland, Shawn Guo,
	Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam,
	NXP Linux Team, Andrzej Hajda, Neil Armstrong, Jonas Karlman,
	Jernej Skrabec, Lee Jones, dri-devel, devicetree,
	linux-arm-kernel, linux-kernel, Robert Chiras
In-Reply-To: <20190727015716.GA4902@pendragon.ideasonboard.com>

Hi Laurent,

thanks for having a look.

On Sat, Jul 27, 2019 at 04:57:16AM +0300, Laurent Pinchart wrote:
> 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@sigxcpu.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@30a00000 {
> > +		#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.

I've followed you suggestions while moving the whole thing to YAML
syntax for an upcoming v2.

Thanks for having a look,
Cheers,
 -- Guido

> > +	};
> 
> -- 
> Regards,
> 
> Laurent Pinchart
> 

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