Re: [PATCH v5 06/12] media: dt-bindings: add bindings for i.MX7 media driver

[Rob Herring <robh@kernel.org>]

On Fri, May 18, 2018 at 10:28:00AM +0100, Rui Miguel Silva wrote:
> Add bindings documentation for i.MX7 media drivers.
> 
> Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
> ---
>  .../devicetree/bindings/media/imx7.txt        | 125 ++++++++++++++++++
>  1 file changed, 125 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/imx7.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/imx7.txt b/Documentation/devicetree/bindings/media/imx7.txt
> new file mode 100644
> index 000000000000..a26372630377
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/imx7.txt
> @@ -0,0 +1,125 @@
> +Freescale i.MX7 Media Video Device
> +==================================
> +
> +mipi_csi2 node
> +--------------
> +
> +This is the device node for the MIPI CSI-2 receiver core in i.MX7 SoC. It is
> +compatible with previous version of Samsung D-phy.
> +
> +Required properties:
> +
> +- compatible    : "fsl,imx7-mipi-csi2";
> +- reg           : base address and length of the register set for the device;
> +- interrupts    : should contain MIPI CSIS interrupt;
> +- clocks        : list of clock specifiers, see
> +        Documentation/devicetree/bindings/clock/clock-bindings.txt for details;
> +- clock-names   : must contain "pclk", "wrap" and "phy" entries, matching
> +                  entries in the clock property;
> +- power-domains : a phandle to the power domain, see
> +          Documentation/devicetree/bindings/power/power_domain.txt for details.
> +- reset-names   : should include following entry "mrst";
> +- resets        : a list of phandle, should contain reset entry of
> +                  reset-names;
> +- phy-supply    : from the generic phy bindings, a phandle to a regulator that
> +	          provides power to MIPI CSIS core;
> +- bus-width     : maximum number of data lanes supported (SoC specific);

This property is for parallel buses. Either just rely on data-lanes in 
the graph or this should be implied by the compatible.

> +
> +Optional properties:
> +
> +- clock-frequency : The IP's main (system bus) clock frequency in Hz, default
> +		    value when this property is not specified is 166 MHz;
> +
> +port node
> +---------
> +
> +- reg		  : (required) can take the values 0 or 1, where 0 is the
> +                     related sink port and port 1 should be the source one;
> +
> +endpoint node
> +-------------
> +
> +- data-lanes    : (required) an array specifying active physical MIPI-CSI2
> +		    data input lanes and their mapping to logical lanes; the
> +		    array's content is unused, only its length is meaningful;
> +
> +- fsl,csis-hs-settle : (optional) differential receiver (HS-RX) settle time;

units and unit-suffix?

> +
> +example:
> +
> +        mipi_csi: mipi-csi@30750000 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                compatible = "fsl,imx7-mipi-csi2";
> +                reg = <0x30750000 0x10000>;
> +                interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +                clocks = <&clks IMX7D_IPG_ROOT_CLK>,
> +                                <&clks IMX7D_MIPI_CSI_ROOT_CLK>,
> +                                <&clks IMX7D_MIPI_DPHY_ROOT_CLK>;

> +                clock-names = "pclk", "wrap", "phy";
> +                clock-names = "mipi", "phy";

Err...

> +                clock-frequency = <166000000>;
> +                power-domains = <&pgc_mipi_phy>;
> +                phy-supply = <&reg_1p0d>;
> +                resets = <&src IMX7_RESET_MIPI_PHY_MRST>;
> +                reset-names = "mrst";
> +                bus-width = <4>;
> +                fsl,csis-hs-settle = <3>;
> +                fsl,csis-clk-settle = <0>;

Not documented.

> +
> +                port@0 {
> +                        reg = <0>;
> +
> +                        mipi_from_sensor: endpoint {
> +                                remote-endpoint = <&ov2680_to_mipi>;
> +                                data-lanes = <1>;
> +                        };
> +                };
> +
> +                port@1 {
> +                        reg = <1>;
> +
> +                        mipi_vc0_to_csi_mux: endpoint {
> +                                remote-endpoint = <&csi_mux_from_mipi_vc0>;
> +                        };
> +                };
> +        };
> +
> +
> +csi node
> +--------

I'd prefer these split into 2 files.

> +
> +This is device node for the CMOS Sensor Interface (CSI) which enables the chip
> +to connect directly to external CMOS image sensors.
> +
> +Required properties:
> +
> +- compatible    : "fsl,imx7-csi";
> +- reg           : base address and length of the register set for the device;
> +- interrupts    : should contain CSI interrupt;
> +- clocks        : list of clock specifiers, see
> +        Documentation/devicetree/bindings/clock/clock-bindings.txt for details;
> +- clock-names   : must contain "axi", "mclk" and "dcic" entries, matching
> +                 entries in the clock property;

Need the OF graph details.

> +
> +example:
> +
> +                csi: csi@30710000 {
> +                        #address-cells = <1>;
> +                        #size-cells = <0>;
> +
> +                        compatible = "fsl,imx7-csi";
> +                        reg = <0x30710000 0x10000>;
> +                        interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
> +                        clocks = <&clks IMX7D_CLK_DUMMY>,
> +                                        <&clks IMX7D_CSI_MCLK_ROOT_CLK>,
> +                                        <&clks IMX7D_CLK_DUMMY>;
> +                        clock-names = "axi", "mclk", "dcic";
> +
> +                        port {
> +                                csi_from_csi_mux: endpoint {
> +                                        remote-endpoint = <&csi_mux_to_csi>;
> +                                };
> +                        };
> +                };
> -- 
> 2.17.0
>