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Date:   Tue, 7 Jan 2020 18:19:32 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Ezequiel Garcia <ezequiel@collabora.com>
Cc:     Helen Koike <helen.koike@collabora.com>,
        linux-rockchip@lists.infradead.org, mark.rutland@arm.com,
        devicetree@vger.kernel.org, eddie.cai.linux@gmail.com,
        mchehab@kernel.org, heiko@sntech.de, gregkh@linuxfoundation.org,
        andrey.konovalov@linaro.org, linux-kernel@vger.kernel.org,
        tfiga@chromium.org, robh+dt@kernel.org, hans.verkuil@cisco.com,
        sakari.ailus@linux.intel.com, joacim.zetterling@gmail.com,
        kernel@collabora.com, linux-media@vger.kernel.org,
        jacob-chen@iotwrt.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v12 08/11] media: staging: dt-bindings: add Rockchip ISP1
 yaml bindings
Message-ID: <20200107161932.GJ4871@pendragon.ideasonboard.com>
References: <20191227200116.2612137-1-helen.koike@collabora.com>
 <20191227200116.2612137-9-helen.koike@collabora.com>
 <20200106235957.GA28230@pendragon.ideasonboard.com>
 <a465c895f944b5cb0b63bfab2f8642fc81f1576e.camel@collabora.com>
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Hi Ezequiel,

On Tue, Jan 07, 2020 at 10:45:15AM -0300, Ezequiel Garcia wrote:
> On Tue, 2020-01-07 at 01:59 +0200, Laurent Pinchart wrote:
> > On Fri, Dec 27, 2019 at 05:01:13PM -0300, Helen Koike wrote:
> > > Add yaml DT bindings for Rockchip ISP1.
> > > 
> > > This was tested and verified with:
> > > mv drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml Documentation/devicetree/bindings/media/
> > > make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> > > make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> > > 
> > > Signed-off-by: Helen Koike <helen.koike@collabora.com>
> > > 
> > > ---
> > > 
> > > Changes in v12:
> > > - The commit replaces the following commit in previous series named
> > > media: staging: dt-bindings: Document the Rockchip ISP1 bindings
> > > This new patch adds yaml binding and was verified with
> > > make dtbs_check and make dt_binding_check
> > > 
> > > Changes in v11:
> > > - add clock-names values
> > > 
> > > Changes in v10:
> > > - unsquash
> > > 
> > > Changes in v9:
> > > - squash
> > > - move to staging
> > > 
> > > Changes in v8:
> > > - fix title division style
> > > 
> > > Changes in v7:
> > > - update document with new design and tested example
> > > 
> > >  .../bindings/media/rockchip-isp1.yaml         | 193 ++++++++++++++++++
> > >  1 file changed, 193 insertions(+)
> > >  create mode 100644 drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> > > 
> > > diff --git a/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> > > b/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> > > new file mode 100644
> > > index 000000000000..4d1b2c67a4cd
> > > --- /dev/null
> > > +++ b/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> > > @@ -0,0 +1,193 @@
> > > +# SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/media/rockchip-isp1.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Rockchip SoC Image Signal Processing unit v1
> > > +
> > > +maintainers:
> > > +  - Helen Koike <helen.koike@collabora.com>
> > > +
> > > +description: |
> > > +  Rockchip ISP1 is the Camera interface for the Rockchip series of SoCs
> > > +  which contains image processing, scaling, and compression funcitons.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: rockchip,rk3399-cif-isp
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  iommus:
> > > +    maxItems: 1
> > > +
> > > +  power-domains:
> > > +    maxItems: 1
> > > +
> > > +  phys:
> > > +    maxItems: 1
> > > +    description: phandle for the PHY port
> > 
> > According to http://opensource.rock-chips.com/wiki_Camera_driver, RK3388
> > can route either of DPHY RX0 or DPHY RX1 to the single ISP instance,
> > while RK3399 has one PHY per ISP instance, with DPHY RX1 being shared
> > with the display. Have you given any thought on how we will support this
> > in a backward-compatible way in the DT bindings ?
> 
> As discussed on IRC, we could have multiple PHYs specifiers
> in the phy property. The ISP would have multiple ports,
> with one PHY per port.
> 
> > > +
> > > +  phy-names:
> > > +    const: dphy
> > > +
> > > +  clocks:
> > > +    items:
> > > +      - description: ISP clock
> > > +      - description: ISP aclk clock
> > > +      - description: ISP aclk wrapper clock
> > > +      - description: ISP hclk clock
> > > +      - description: ISP hclk wrapper clock
> > 
> > I wonder what aclk and hclk stand far. In any case those names match the
> > CRU documentation, so that seems fine.
> 
> IIRC, traditionally, Rockchip calls aclk to the AXI clock,
> and hclk to the AHB. We'll improve this description.
> 
> > > +
> > > +  clock-names:
> > > +    items:
> > > +      - const: clk_isp
> > > +      - const: aclk_isp
> > > +      - const: aclk_isp_wrap
> > > +      - const: hclk_isp
> > > +      - const: hclk_isp_wrap
> > > +
> 
> I wonder if we should better amend the names as well.

We could, but they match the names in the CRU documentation, so I think
they're fine.

> > > +  # See ./video-interfaces.txt for details
> > > +  ports:
> > > +    type: object
> > > +    additionalProperties: false
> > > +
> > > +    properties:
> > > +      "#address-cells":
> > > +        const: 1
> > > +
> > > +      "#size-cells":
> > > +        const: 0
> > > +
> > > +      port@0:
> > > +        type: object
> > > +        additionalProperties: false
> > 
> > I think this should have a description to tell what this port
> > corresponds to.
> 
> OK.
> 
> > > +
> > > +        properties:
> > > +          "#address-cells":
> > > +            const: 1
> > > +
> > > +          "#size-cells":
> > > +            const: 0
> > > +
> > > +          reg:
> > > +            const: 0
> > > +            description: port identifier.
> > 
> > Here and for the endpoint below the description is probably not needed.
> 
> OK.
> 
> > > +
> > > +        patternProperties:
> > > +          endpoint:
> > > +            type: object
> > > +            additionalProperties: false
> > > +
> > > +            properties:
> > > +              reg:
> > > +                maxItems: 1
> > > +                description: endpoint identifier.
> > > +
> > > +              data-lanes:
> > > +                minItems: 1
> > > +                maxItems: 4
> > > +
> > > +              remote-endpoint: true
> > > +
> > > +    required:
> > > +      - port@0
> > > +
> > > +required:
> > > +  - compatible
> > > +  - interrupts
> > > +  - clocks
> > > +  - clock-names
> > > +  - power-domains
> > > +  - iommus
> > > +  - phys
> > > +  - phy-names
> > > +  - ports
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > +  - |
> > > +
> > > +    #include <dt-bindings/clock/rk3399-cru.h>
> > > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > > +    #include <dt-bindings/power/rk3399-power.h>
> > > +
> > > +    parent0: parent@0 {
> > > +        #address-cells = <2>;
> > > +        #size-cells = <2>;
> > > +
> > > +        isp0: isp0@ff910000 {
> > > +            compatible = "rockchip,rk3399-cif-isp";
> > > +            reg = <0x0 0xff910000 0x0 0x4000>;
> > > +            interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH 0>;
> > > +            clocks = <&cru SCLK_ISP0>,
> > > +                     <&cru ACLK_ISP0>, <&cru ACLK_ISP0_WRAPPER>,
> > > +                     <&cru HCLK_ISP0>, <&cru HCLK_ISP0_WRAPPER>;
> > > +            clock-names = "clk_isp",
> > > +                          "aclk_isp", "aclk_isp_wrap",
> > > +                          "hclk_isp", "hclk_isp_wrap";
> > > +            power-domains = <&power RK3399_PD_ISP0>;
> > > +            iommus = <&isp0_mmu>;
> > > +            phys = <&dphy>;
> > > +            phy-names = "dphy";
> > > +
> > > +            ports {
> > > +                #address-cells = <1>;
> > > +                #size-cells = <0>;
> > > +
> > > +                port@0 {
> > > +                    #address-cells = <1>;
> > > +                    #size-cells = <0>;
> > > +                    reg = <0>;
> > > +
> > > +                    mipi_in_wcam: endpoint@0 {
> > > +                        reg = <0>;
> > > +                        remote-endpoint = <&wcam_out>;
> > > +                        data-lanes = <1 2>;
> > > +                    };
> > > +
> > > +                    mipi_in_ucam: endpoint@1 {
> > > +                        reg = <1>;
> > > +                        remote-endpoint = <&ucam_out>;
> > > +                        data-lanes = <1>;
> > > +                    };
> > 
> > Are those two cameras connected to the same CSI-2 lines with at most one
> > sensor out of reset ?
> 
> Indeed, these are two cameras connected to the same DPHY,
> and only one can work at a time.
> 
> > With the above small issues addressed,
> > 
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

-- 
Regards,

Laurent Pinchart