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Message-ID: <eae3abb65452a09f822088eab10b26a5d35273ea.camel@puri.sm>
Subject: Re: [PATCH v6 1/3] dt-bindings: media: document the
 nxp,imx8mq-mipi-csi2 receiver phy and controller
From:   Martin Kepplinger <martin.kepplinger@puri.sm>
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc:     festevam@gmail.com, krzk@kernel.org, devicetree@vger.kernel.org,
        kernel@pengutronix.de, kernel@puri.sm,
        linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
        linux-staging@lists.linux.dev, m.felsch@pengutronix.de,
        mchehab@kernel.org, phone-devel@vger.kernel.org, robh@kernel.org,
        shawnguo@kernel.org, slongerbeam@gmail.com
Date:   Wed, 14 Jul 2021 20:07:44 +0200
In-Reply-To: <YO8kgHoV/PVlF3oV@pendragon.ideasonboard.com>
References: <20210714111931.324485-1-martin.kepplinger@puri.sm>
         <20210714111931.324485-2-martin.kepplinger@puri.sm>
         <YO8kgHoV/PVlF3oV@pendragon.ideasonboard.com>
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Am Mittwoch, dem 14.07.2021 um 20:53 +0300 schrieb Laurent Pinchart:
> Hi Martin,
> 
> Thank you for the patch.
> 
> On Wed, Jul 14, 2021 at 01:19:29PM +0200, Martin Kepplinger wrote:
> > The i.MX8MQ SoC integrates a different MIPI CSI receiver as the
> > i.MX8MM so
> > describe the DT bindings for it.
> > 
> > Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
> > Reviewed-by: Rob Herring <robh@kernel.org>
> > ---
> >  .../bindings/media/nxp,imx8mq-mipi-csi2.yaml  | 173
> > ++++++++++++++++++
> >  1 file changed, 173 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/media/nxp,imx8mq-
> > mipi-csi2.yaml
> > b/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml
> > new file mode 100644
> > index 000000000000..97222485f223
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-
> > csi2.yaml
> > @@ -0,0 +1,173 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: 
> > http://devicetree.org/schemas/media/nxp,imx8mq-mipi-csi2.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: NXP i.MX8MQ MIPI CSI-2 receiver
> > +
> > +maintainers:
> > +  - Martin Kepplinger <martin.kepplinger@puri.sm>
> > +
> > +description: |-
> > +  This binding covers the CSI-2 RX PHY and host controller
> > included in the
> > +  NXP i.MX8MQ SoC. It handles the sensor/image input and process
> > for all the
> > +  input imaging devices.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - fsl,imx8mq-mipi-csi2
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: core is the RX Controller Core Clock input.
> > This clock
> > +                     must be exactly equal to or faster than the
> > receive
> > +                     byteclock from the RX DPHY.
> > +      - description: esc is the Rx Escape Clock. This must be the
> > same escape
> > +                     clock that the RX DPHY receives.
> > +      - description: ui is the pixel clock (phy_ref up to 333Mhz).
> 
> Where did you get the 333MHz limit from ? The information I've
> received
> indicate a limit of 125MHz for the UI clock (and 266 and 133 MHz for
> the
> core and esc clocks respectively).

The latest ref.manual revison has this corrected to 333Mhz. Look at the
"changelog" they have in the RM, to find it quickly.

> 
> With this addressed,
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> > +                     See the reference manual for details.
> > +
> > +  clock-names:
> > +    items:
> > +      - const: core
> > +      - const: esc
> > +      - const: ui
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +  resets:
> > +    items:
> > +      - description: CORE_RESET reset register bit definition
> > +      - description: PHY_REF_RESET reset register bit definition
> > +      - description: ESC_RESET reset register bit definition
> > +
> > +  fsl,mipi-phy-gpr:
> > +    description: |
> > +      The phandle to the imx8mq syscon iomux-gpr with the register
> > +      for setting RX_ENABLE for the mipi receiver.
> > +
> > +      The format should be as follows:
> > +      <gpr req_gpr>
> > +      gpr is the phandle to general purpose register node.
> > +      req_gpr is the gpr register offset of RX_ENABLE for the mipi
> > phy.
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    items:
> > +      items:
> > +        - description: The 'gpr' is the phandle to general purpose
> > register node.
> > +        - description: The 'req_gpr' is the gpr register offset
> > containing
> > +                       CSI2_1_RX_ENABLE or CSI2_2_RX_ENABLE
> > respectively.
> > +          maximum: 0xff
> > +
> > +  interconnects:
> > +    maxItems: 1
> > +
> > +  interconnect-names:
> > +    const: dram
> > +
> > +  ports:
> > +    $ref: /schemas/graph.yaml#/properties/ports
> > +
> > +    properties:
> > +      port@0:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description:
> > +          Input port node, single endpoint describing the CSI-2
> > transmitter.
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: video-interfaces.yaml#
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              data-lanes:
> > +                items:
> > +                  minItems: 1
> > +                  maxItems: 4
> > +                  items:
> > +                    - const: 1
> > +                    - const: 2
> > +                    - const: 3
> > +                    - const: 4
> > +
> > +            required:
> > +              - data-lanes
> > +
> > +      port@1:
> > +        $ref: /schemas/graph.yaml#/properties/port
> > +        description:
> > +          Output port node
> > +
> > +    required:
> > +      - port@0
> > +      - port@1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - power-domains
> > +  - resets
> > +  - fsl,mipi-phy-gpr
> > +  - ports
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/imx8mq-clock.h>
> > +    #include <dt-bindings/interconnect/imx8mq.h>
> > +
> > +    csi@30a70000 {
> > +        compatible = "fsl,imx8mq-mipi-csi2";
> > +        reg = <0x30a70000 0x1000>;
> > +        clocks = <&clk IMX8MQ_CLK_CSI1_CORE>,
> > +                 <&clk IMX8MQ_CLK_CSI1_ESC>,
> > +                 <&clk IMX8MQ_CLK_CSI1_PHY_REF>;
> > +        clock-names = "core", "esc", "ui";
> > +        assigned-clocks = <&clk IMX8MQ_CLK_CSI1_CORE>,
> > +                          <&clk IMX8MQ_CLK_CSI1_PHY_REF>,
> > +                          <&clk IMX8MQ_CLK_CSI1_ESC>;
> > +        assigned-clock-rates = <266000000>, <200000000>,
> > <66000000>;
> > +        assigned-clock-parents = <&clk IMX8MQ_SYS1_PLL_266M>,
> > +                                 <&clk IMX8MQ_SYS2_PLL_1000M>,
> > +                                 <&clk IMX8MQ_SYS1_PLL_800M>;
> > +        power-domains = <&pgc_mipi_csi1>;
> > +        resets = <&src IMX8MQ_RESET_MIPI_CSI1_CORE_RESET>,
> > +                 <&src IMX8MQ_RESET_MIPI_CSI1_PHY_REF_RESET>,
> > +                 <&src IMX8MQ_RESET_MIPI_CSI1_ESC_RESET>;
> > +        fsl,mipi-phy-gpr = <&iomuxc_gpr 0x88>;
> > +        interconnects = <&noc IMX8MQ_ICM_CSI1 &noc
> > IMX8MQ_ICS_DRAM>;
> > +        interconnect-names = "dram";
> > +
> > +        ports {
> > +            #address-cells = <1>;
> > +            #size-cells = <0>;
> > +
> > +            port@0 {
> > +                reg = <0>;
> > +
> > +                imx8mm_mipi_csi_in: endpoint {
> > +                    remote-endpoint = <&imx477_out>;
> > +                    data-lanes = <1 2 3 4>;
> > +                };
> > +            };
> > +
> > +            port@1 {
> > +                reg = <1>;
> > +
> > +                imx8mm_mipi_csi_out: endpoint {
> > +                    remote-endpoint = <&csi_in>;
> > +                };
> > +            };
> > +        };
> > +    };
> > +
> > +...
>