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Message-ID: <YMfU9jjGU49IKe3Y@pendragon.ideasonboard.com>
Date: Tue, 15 Jun 2021 01:15:18 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Martin Kepplinger <martin.kepplinger@...i.sm>
Cc: devicetree@...r.kernel.org, festevam@...il.com,
kernel@...gutronix.de, kernel@...i.sm, krzk@...nel.org,
linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
linux-staging@...ts.linux.dev, mchehab@...nel.org,
phone-devel@...r.kernel.org, robh@...nel.org, shawnguo@...nel.org,
slongerbeam@...il.com, m.felsch@...gutronix.de
Subject: Re: [PATCH v4 1/3] dt-bindings: media: document the
nxp,imx8mq-mipi-csi2 receiver phy and controller
Hi Martin,
Thank you for the patch.
On Mon, Jun 14, 2021 at 02:15:20PM +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@...i.sm>
> ---
> .../bindings/media/nxp,imx8mq-mipi-csi2.yaml | 171 ++++++++++++++++++
> 1 file changed, 171 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..4fed224ebfdd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml
> @@ -0,0 +1,171 @@
> +# 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@...i.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: pxl is the pixel clock (phy_ref up to 333Mhz).
> + - description: clko2 is the CLKO2 clock root.
> + See the reference manual for details.
Copying comments from 4/4:
I can't figure out what the clko2 clock is used for based on the
datasheet. It seems to be a clock output by the SoC on GPIO1_IO15, and
doesn't seem to belong here.
Regarding core, esc and pix, do these clock correspond to the clk,
clk_esc and clk_ui listed in table 13-36 (section 13.8.3.3.1 "RX Local
Interface Description") of the TRM ? If so, should they be renamed
accordingly, to either "clk", "clk_esc" and "clk_ui", or, if we want to
drop the prefixes, "core", "esc" and "ui" ?
> +
> + clock-names:
> + items:
> + - const: core
> + - const: esc
> + - const: pxl
> + - const: clko2
> +
> + power-domains:
> + maxItems: 1
> +
> + resets:
> + maxItems: 1
> +
> + 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
I'll let Rob comment on this one :-)
> +
> + 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@...70000 {
> + 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>,
> + <&clk IMX8MQ_CLK_CLKO2>;
> + clock-names = "core", "esc", "pxl", "clko2";
> + 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>;
> + 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>;
> + };
> + };
> + };
> + };
> +
> +...
--
Regards,
Laurent Pinchart
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