Re: [PATCH v12 09/11] media: staging: dt-bindings: add Rockchip MIPI RX D-PHY yaml bindings

[Ezequiel Garcia]

Hi Laurent,

Thanks a lot for reviewing this.

On Tue, 2020-01-07 at 02:10 +0200, Laurent Pinchart wrote:
> Hi Helen,
> 
> Thank you for the patch.
> 
> On Fri, Dec 27, 2019 at 05:01:14PM -0300, Helen Koike wrote:
> > Add yaml DT bindings for Rockchip MIPI D-PHY RX
> > 
> > This was tested and verified with:
> > mv drivers/staging/media/phy-rockchip-dphy/Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml  Documentation/devicetree/bindings/phy/
> > make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml
> > make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml
> > 
> > Signed-off-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>
> > 
> > ---
> > 
> > Changes in v12:
> > - The commit replaces the following commit in previous series named
> > media: staging: dt-bindings: Document the Rockchip MIPI RX D-PHY bindings
> > This new patch adds yaml binding and was verified with
> > make dtbs_check and make dt_binding_check
> > 
> > Changes in v11: None
> > Changes in v10:
> > - unsquash
> > 
> > Changes in v9:
> > - fix title division style
> > - squash
> > - move to staging
> > 
> > Changes in v8: None
> > Changes in v7:
> > - updated doc with new design and tested example
> > 
> >  .../bindings/phy/rockchip-mipi-dphy.yaml      | 75 +++++++++++++++++++
> >  1 file changed, 75 insertions(+)
> >  create mode 100644 drivers/staging/media/phy-rockchip-dphy/Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml
> > 
> > diff --git a/drivers/staging/media/phy-rockchip-dphy/Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml b/drivers/staging/media/phy-
> > rockchip-dphy/Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml
> > new file mode 100644
> > index 000000000000..af97f1b3e005
> > --- /dev/null
> > +++ b/drivers/staging/media/phy-rockchip-dphy/Documentation/devicetree/bindings/phy/rockchip-mipi-dphy.yaml
> > @@ -0,0 +1,75 @@
> > +# SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/phy/rockchip-mipi-dphy.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Rockchip SoC MIPI RX0 D-PHY Device Tree Bindings
> 
> Should this be s/RX0/RX/ ? Or do you expect different bindings for RX1 ?

The driver currently only supports RX0, but I think you are right,
it should say RX here. This binding could be extended for RX1.

> Looking at the PHY driver, it seems to handle all PHYs with a single
> struct device. Should we thus use #phy-cells = <1> to select the PHY ?
> 

I am not following this. The driver handles just one PHY. Each PHY
should have its own node.

> > +
> > +maintainers:
> > +  - Helen Koike <helen.koike@xxxxxxxxxxxxx>
> > +  - Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> > +
> > +description: |
> > +  The Rockchip SoC has a MIPI D-PHY bus with an RX0 entry which connects to
> > +  the ISP1 (Image Signal Processing unit v1.0) for CSI cameras.
> > +
> > +properties:
> > +  compatible:
> > +    const: rockchip,rk3399-mipi-dphy
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: Mipi d-phy ref clock
> > +      - description: Mipi d-phy rx0 cfg clock
> 
> s/Mipi d-phy/MIPI D-PHY/
> 

Yep.

> > +      - description: Video in/out general register file clock
> > +
> > +  clock-names:
> > +    items:
> > +      - const: dphy-ref
> > +      - const: dphy-cfg
> > +      - const: grf
> > +
> > +  '#phy-cells':
> > +    const: 0
> > +
> > +  power-domains:
> > +    description: Video in/out power domain.
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - clocks
> > +  - clock-names
> > +  - '#phy-cells'
> > +  - power-domains
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +
> > +    /*
> > +     * MIPI RX D-PHY use registers in "general register files", it
> > +     * should be a child of the GRF.
> > +     *
> > +     * grf: syscon@ff770000 {
> > +     *  compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
> > +     *  ...
> 
> missing
> 
> 	* };
> 

OK.

> > +     */
> > +
> > +    #include <dt-bindings/clock/rk3399-cru.h>
> > +    #include <dt-bindings/power/rk3399-power.h>
> > +
> > +    dphy: mipi-dphy {
> > +        compatible = "rockchip,rk3399-mipi-dphy";
> > +        clocks = <&cru SCLK_MIPIDPHY_REF>,
> > +                 <&cru SCLK_DPHY_RX0_CFG>,
> > +                 <&cru PCLK_VIO_GRF>;
> > +        clock-names = "dphy-ref", "dphy-cfg", "grf";
> > +        power-domains = <&power RK3399_PD_VIO>;
> > +        #phy-cells = <0>;
> > +    };