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Date: Tue, 27 Nov 2018 15:46:38 +0200
From: Sakari Ailus <sakari.ailus@....fi>
To: Wen Nuan <leo.wen@...k-chips.com>
Cc: mchehab@...nel.org, davem@...emloft.net,
gregkh@...uxfoundation.org, linus.walleij@...aro.org,
rdunlap@...radead.org, jacob2.chen@...k-chips.com,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
eddie.cai@...k-chips.com
Subject: Re: [PATCH v4 2/2] dt-bindings: Document the Rockchip RK1608 bindings
Hi Leo,
I found this, and thought of replying. It's an old patch. Feel free to ping
if you don't get replies.
On Thu, Mar 08, 2018 at 02:38:42PM +0800, Wen Nuan wrote:
> From: Leo Wen <leo.wen@...k-chips.com>
>
> Add DT bindings documentation for Rockchip RK1608.
>
> Changes V4:
> - Revise the comment of node.
> - Revise the comment of 'endpoint@1'.
>
> Signed-off-by: Leo Wen <leo.wen@...k-chips.com>
> ---
> Documentation/devicetree/bindings/media/rk1608.txt | 95 ++++++++++++++++++++++
> MAINTAINERS | 1 +
> 2 files changed, 96 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/rk1608.txt
>
> diff --git a/Documentation/devicetree/bindings/media/rk1608.txt b/Documentation/devicetree/bindings/media/rk1608.txt
> new file mode 100644
> index 0000000..ea23d2d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/rk1608.txt
> @@ -0,0 +1,95 @@
> +Rockchip RK1608 as a PreISP to link on Soc
> +------------------------------------------
> +
> +Required properties:
> +
> +- compatible : "rockchip,rk1608";
> +- reg : SPI slave address of the rk1608;
> +- clocks : Must contain an entry for each entry in clock-names;
> +- clock-names : Must contain "mclk" for the device's master clock;
> +- reset-gpios : GPIO connected to reset pin;
> +- irq-gpios : GPIO connected to irq pin;
> +- sleepst-gpios : GPIO connected to sleepst pin;
There are quite a few sleep-gpios in the current bindings. How about
aligning the naming?
> +- wakeup-gpios : GPIO connected to wakeup pin;
> +- powerdown-gpios : GPIO connected to powerdown pin;
> +- pinctrl-names : Should contain only one value - "default";
> +- pinctrl-0 : Pin control group to be used for this controller;
> +
> +Optional properties:
> +
> +- spi-max-frequency : Maximum SPI clocking speed of the device;
> +
> +The device node should contain one or two port child nodes with child
> +'endpoint' node. There are two ports then port@0 must
> +describe the output and port@1 input channels. Please refer to the
> +bindings defined in
> +Documentation/devicetree/bindings/media/video-interfaces.txt.
I think that to be meaningful, you actually need two port nodes. Must ->
shall.
> +
> +endpoint node
> +-------------
> +
> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
> + video-interfaces.txt. If present it should be <1> - the device
> + supports only one data lane without re-mapping.
You still have four lanes in the example below.
> +
> +Note1: Since no data is generated in RK1608，so this is meaningful that you need
> +a extra sensor (such as a camera) mounted on RK1608. You need to use endpoint@x
> +to match these sensors.
> +
> +Note2:You must set the current value of the spi pins to be 8mA, if they are not.
> +
> +Example:
> +&spi0 {
> + status = "okay";
> + spi_rk1608@00 {
> + compatible = "rockchip,rk1608";
> + status = "okay";
> + reg = <0>;
> + spi-max-frequency = <24000000>;
> + link-freqs = /bits/ 64 <LINK_FREQ>;
> + clocks = <&cru SCLK_SPI0>, <&cru SCLK_VIP_OUT>,
> + <&cru DCLK_VOP0>, <&cru ACLK_VIP>, <&cru HCLK_VIP>,
> + <&cru PCLK_ISP_IN>, <&cru PCLK_ISP_IN>,
> + <&cru PCLK_ISP_IN>, <&cru SCLK_MIPIDSI_24M>,
> + <&cru PCLK_MIPI_CSI>;
> + clock-names = "mclk", "mipi_clk", "pd_cif", "aclk_cif",
> + "hclk_cif", "cif0_in", "g_pclkin_cif",
> + "cif0_out", "clk_mipi_24m", "hclk_mipiphy";
> + reset-gpios = <&gpio6 0 GPIO_ACTIVE_HIGH>;
> + irq-gpios = <&gpio6 2 GPIO_ACTIVE_HIGH>;
> + sleepst-gpios = <&gpio6 1 GPIO_ACTIVE_HIGH>;
> + wakeup-gpios = <&gpio6 4 GPIO_ACTIVE_HIGH>;
> + powerdown-gpios = <&gpio8 0 GPIO_ACTIVE_HIGH>;
> +
> + pinctrl-names = "default";
> + pinctrl-0 = <&rk1608_irq_gpios &rk1608_wake_gpios
> + &rk1608_sleep_gpios>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + port@0 {
reg missing here and the port below.
> + mipi_dphy_out0: endpoint@0 {
No need for "@0" as you only have a single endpoint.
> + remote-endpoint = <&mipi_dphy_in0>;
> + clock-lanes = <0>;
> + data-lanes = <1 2 3 4>;
> + clock-noncontinuous;
> + link-frequencies =
> + /bits/ 64 <LINK_FREQ>;
> + };
> + };
> +
> + port@1 {
> + sensor_in0: endpoint@0 {
reg missing here and below.
> + remote-endpoint = <&sensor_out0>;
> + };
> + /* If you have a second sensor,
> + * add the 'endpoint@1' node here.
> + */
> + sensor_in1: endpoint@1 {
> + remote-endpoint = <&sensor_out1>;
> + };
> + };
> + };
> + };
> +};
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b2a98e3..04d227b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -141,6 +141,7 @@ M: Leo Wen <leo.wen@...k-chips.com>
> S: Maintained
> F: drivers/media/spi/rk1608.c
> F: drivers/media/spi/rk1608.h
> +F: Documentation/devicetree/bindings/media/rk1608.txt
>
> 3C59X NETWORK DRIVER
> M: Steffen Klassert <klassert@...hematik.tu-chemnitz.de>
--
Regards,
Sakari Ailus
e-mail: sakari.ailus@....fi
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