Hi Laurent, On Wed, May 31, 2023 at 02:06:00PM +0300, Laurent Pinchart wrote: > Hi Tommaso, > > On Wed, May 31, 2023 at 12:20:47PM +0200, Tommaso Merciai wrote: > > On Mon, May 29, 2023 at 09:43:26AM +0300, Laurent Pinchart wrote: > > > On Mon, May 29, 2023 at 09:39:13AM +0300, Laurent Pinchart wrote: > > > > On Sun, May 28, 2023 at 09:16:05PM +0000, Sakari Ailus wrote: > > > > > On Fri, May 26, 2023 at 07:39:43PM +0200, Tommaso Merciai wrote: > > > > > > Add documentation of device tree in YAML schema for the ALVIUM > > > > > > Camera from Allied Vision Inc. > > > > > > > > > > > > References: > > > > > > - https://www.alliedvision.com/en/products/embedded-vision-solutions > > > > > > > > > > > > Signed-off-by: Tommaso Merciai <tomm.merciai@xxxxxxxxx> > > > > > > --- > > > > > > Changes since v1: > > > > > > - Fixed build error as suggested by RHerring bot > > > > > > > > > > > > .../media/i2c/alliedvision,alvium.yaml | 115 ++++++++++++++++++ > > > > > > 1 file changed, 115 insertions(+) > > > > > > create mode 100644 Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml > > > > > > > > > > > > diff --git a/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml > > > > > > new file mode 100644 > > > > > > index 000000000000..81e9e560c99d > > > > > > --- /dev/null > > > > > > +++ b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml > > > > > > @@ -0,0 +1,115 @@ > > > > > > +# SPDX-License-Identifier: GPL-2.0 > > > > > > +%YAML 1.2 > > > > > > +--- > > > > > > +$id: http://devicetree.org/schemas/media/i2c/alliedvision,alvium.yaml# > > > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > > > > + > > > > > > +title: Alliedvision Alvium Camera > > > > > > > > s/Alliedvision/Allied Vision/ > > > > > > > > > > + > > > > > > +maintainers: > > > > > > + - Tommaso Merciai <tomm.merciai@xxxxxxxxx> > > > > > > + - Martin Hecht <martin.hecht@xxxxxxxx> > > > > > > + > > > > > > +allOf: > > > > > > + - $ref: /schemas/media/video-interface-devices.yaml# > > > > > > + > > > > > > +properties: > > > > > > + compatible: > > > > > > + const: alliedvision,alvium > > > > > > > > The name is very generic. There are Alvium camera modules that have a > > > > GMSL or FPD-Link interface, and I'm pretty sure those will require a > > > > different driver. I would add module-specific compatible strings (e.g. > > > > "alliedvision,alvium-1500c", ...) here, with a generic fallback. > > > > "alliedvision,alvium" isn't good as it won't cover GMSL or FPD-Link, > > > > maybe "alliedvision,alvium-csi2" would be an option. > > > > > > Actually, "alvium-1500c" as a specific compatible string won't do. You > > > need the exact model in the compatible string, otherwise it won't be > > > possible for the driver to handle device-specific configuration (for > > > instance accessing registers of the camera sensor for fine-grained > > > configuration). I would thus recommend using "alliedvision,alvium-1500c" > > > and "alliedvision,alvium-1800c" as generic fallbacks, along compatible > > > strings that include the exact device model. > > > > Agree with alliedvision,alvium-csi2 and thanks for your suggestion. > > In my opinion we don’t need names for 1500c and > > others because the same driver can drive all the alvium models. > > Alvium is taking care of different sensor abstractions. > > > > I test with this driver with the following models: > > > > - 1800 C-1240c > > - 1800 C-040c > > - 1500 C-500 > > > > What do you think about? > > As far as I understand, the camera modules allow accessing sensors > registers from the host (through the ISP) for fine-grained > configuration. Even if that's not implemented in the driver at the > moment, I think it's an important feature to eventually support, and it > will require a way for the system to identify the camera module > precisely, to know which sensor the module uses. That's why I would like > that information to be available in DT, in the form of a compatible > string. For instance, > > compatible = "alliedvision,alvium-1500c-1240c", > "alliedvision,alvium-1500c"; > > The driver will only need DT match entries for > "alliedvision,alvium-1500c" and "alliedvision,alvium-1800c". Thanks for your feedback. Some clarification: The Alvium doesn't allow direct access on the sensor. Alvium hides the particular sensor totally. For this reason I would prefer to keep generic "alvium-csi2" name. What do you think? Thanks, Tommaso > > > > > > > + > > > > > > + reg: > > > > > > + maxItems: 1 > > > > > > + > > > > > > + clocks: > > > > > > + description: XCLK Input Clock > > > > > > + > > > > > > + clock-names: > > > > > > + const: xclk > > > > > > > > > > I'd also drop this as you have a single clock only: it's redundant. > > > > > > > > > > > + > > > > > > + powerdown-gpios: > > > > > > + maxItems: 1 > > > > > > + description: > > > > > > > + Reference to the GPIO connected to the powerdown pin, if any. > > > > > > + > > > > > > + reset-gpios: > > > > > > + maxItems: 1 > > > > > > + description: > > > > > > > + Reference to the GPIO connected to the reset pin, if any. > > > > > > > > Reading the Alvium CSI-2 Cameras User Guide, I don't see any powerdown > > > > or reset pin on the 22-pin connector. Am I missing something ? There are > > > > however two GPIOs (in addition to the I2C signals that are also > > > > documented as GPIOs), do you plan to support those ? > > > > > > > > > > + > > > > > > + streamon-delay: > > > > > > + maxItems: 1 > > > > > > + description: > > > > > > > + Delay before camera start capturing frames in us. > > > > > > > > Add "-us" to the property name to indicate the unit. > > > > > > > > This is a vendor-specific property, and should thus have a vendor > > > > prefix. > > > > > > > > A longer description is needed, from that single line I have no idea > > > > what the property does exactly. > > > > > > > > > > + > > > > > > + rotation: > > > > > > + enum: > > > > > > + - 0 > > > > > > + - 180 > > > > > > > > Why is the rotation restricted to 0 or 180 ? Someone could mount the > > > > module with 90 degrees rotation, shouldn't the DT bindings allow > > > > describing that ? > > > > > > > > You need a property for the vcc-ext-in supply. > > > > > > > > > > + > > > > > > + port: > > > > > > + description: Digital Output Port > > > > > > + $ref: /schemas/graph.yaml#/$defs/port-base > > > > > > + additionalProperties: false > > > > > > + > > > > > > + properties: > > > > > > + endpoint: > > > > > > + $ref: /schemas/media/video-interfaces.yaml# > > > > > > + unevaluatedProperties: false > > > > > > + > > > > > > + properties: > > > > > > + clock-lanes: > > > > > > + const: 0 > > > > > > > > > > The driver can know this, no need to have it in DT, i.e. please drop it. > > > > > > > > > > > + data-lanes: > > > > > > + minItems: 1 > > > > > > + maxItems: 4 > > > > > > + link-frequencies: true > > > > > > + > > > > > > + required: > > > > > > + - data-lanes > > > > > > + - link-frequencies > > > > > > + > > > > > > +required: > > > > > > + - compatible > > > > > > + - reg > > > > > > + - clocks > > > > > > + - clock-names > > > > > > + - port > > > > > > + > > > > > > +additionalProperties: false > > > > > > + > > > > > > +examples: > > > > > > + - | > > > > > > + #include <dt-bindings/gpio/gpio.h> > > > > > > + #include <dt-bindings/clock/imx8mp-clock.h> > > > > > > + > > > > > > + i2c { > > > > > > + #address-cells = <1>; > > > > > > + #size-cells = <0>; > > > > > > + > > > > > > + camera: alvium@3c { > > > > > > + compatible = "alliedvision,alvium"; > > > > > > > > The "alliedvision" prefix is missing from > > > > Documentation/devicetree/bindings/vendor-prefixes.yaml. > > > > > > > > > > + pinctrl-names = "default"; > > > > > > + pinctrl-0 = <&pinctrl_csi0_pwn>, <&pinctrl_csi0_rst>, <&pinctrl_csi_mclk>; > > > > > > > > I'd drop pinctrl, it makes the example longer without adding much value. > > > > > > > > > > + reg = <0x3c>; > > > > > > + clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>; > > > > > > + clock-names = "xclk"; > > > > > > + assigned-clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>; > > > > > > + assigned-clock-parents = <&clk IMX8MP_CLK_24M>; > > > > > > + assigned-clock-rates = <24000000>; > > > > > > + streamon-delay = <20>; > > > > > > + powerdown-gpios = <&gpio2 11 GPIO_ACTIVE_HIGH>; > > > > > > + reset-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>; > > > > > > + status = "okay"; > > > > > > + > > > > > > + port { > > > > > > + alvium_out: endpoint { > > > > > > + remote-endpoint = <&mipi_csi_0_in>; > > > > > > + data-lanes = <1 2 3 4>; > > > > > > + link-frequencies = /bits/ 64 <681250000>; > > > > > > + clock-lanes = <0>; > > > > > > + }; > > > > > > + }; > > > > > > + }; > > > > > > + }; > > > > > > + > > > > > > +... > > -- > Regards, > > Laurent Pinchart
