Hi Laurent, On 22-09-05, Laurent Pinchart wrote: > Hi Marco, > > Thank you for the patch. > > On Thu, Aug 18, 2022 at 04:33:06PM +0200, Marco Felsch wrote: > > Add the bindings for the Toshiba TC358746 Parallel <-> MIPI-CSI bridge > > driver. > > > > Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx> > > --- > > .../bindings/media/i2c/toshiba,tc358746.yaml | 157 ++++++++++++++++++ > > 1 file changed, 157 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/media/i2c/toshiba,tc358746.yaml > > > > diff --git a/Documentation/devicetree/bindings/media/i2c/toshiba,tc358746.yaml b/Documentation/devicetree/bindings/media/i2c/toshiba,tc358746.yaml > > new file mode 100644 > > index 000000000000..9783cca363c6 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/media/i2c/toshiba,tc358746.yaml > > @@ -0,0 +1,157 @@ > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/media/i2c/toshiba,tc358746.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: Toshiba TC358746 Parallel to MIPI CSI2 Bridge > > + > > +maintainers: > > + - Marco Felsch <kernel@xxxxxxxxxxxxxx> > > + > > +description: |- > > + The Toshiba TC358746 converts a parallel video stream into a MIPI CSI-2 > > + stream. The direction can be either parallel-in -> csi-out or csi-in -> > > + parallel-out The chip is programmable trough I2C and SPI but the SPI > > + interface is only supported in parallel-in -> csi-out mode. > > + > > + Note that the current device tree bindings only support the > > + parallel-in -> csi-out path. > > + > > +properties: > > + compatible: > > + const: toshiba,tc358746 > > + > > + reg: > > + maxItems: 1 > > + > > + clocks: > > + description: > > + The phandle to the reference clock source. This corresponds to the > > + hardware pin REFCLK. > > + maxItems: 1 > > + > > + clock-names: > > + const: refclk > > As there's a single clock, should we omit the clock name ? Don't know, I would rather keep it to make it explicite. Many other go that way too. > > +# The bridge can act as clock provider for the sensor. To enable this support > > +# #clock-cells must be specified. Attention if this feature is used than the > > s/than/then/ Sure, thanks. > > > +# mclk rate must be at least: (2 * link-frequency) / 8 > > +# `------------------´ ^ > > +# internal PLL rate smallest possible mclk-div > > Could this be captured in the description of the property instead of a > comment ? Hm.. a few (1,2) bindings using comments like this but I'm not against it. If it belongs to the description, which property should I use? Since there is no: clock-controller property like gpio-controller or interrupt-controller. The clock provider will be activated based on the #clock-cells property. But this property has nothing to with the description since this property specifies the cell size. > > + "#clock-cells": > > + const: 0 > > + > > + clock-output-names: > > + description: > > + The clock name of the MCLK output, the default name is tc358746-mclk. > > + maxItems: 1 > > + > > + vddc-supply: > > + description: Digital core voltage supply, 1.2 volts > > + > > + vddio-supply: > > + description: Digital I/O voltage supply, 1.8 volts > > + > > + vddmipi-supply: > > + description: MIPI CSI phy voltage supply, 1.2 volts > > + > > + reset-gpios: > > + description: > > + The phandle and specifier for the GPIO that controls the chip reset. > > + This corresponds to the hardware pin RESX which is physically active low. > > + maxItems: 1 > > + > > + ports: > > + $ref: /schemas/graph.yaml#/properties/ports > > + properties: > > + port@0: > > + $ref: /schemas/graph.yaml#/properties/port > > + description: Input port > > Are the H/V sync signal polarities fixed, or should they be specified > here ? At the moment they are fixed. I can describe it if you want. > Does the chip support external sync only, or also BT.656 ? In the > latter case this needs a bus-type. Yes, the chip also supports BT.656 but the driver doesn't support it yet. You're right, that we should make it explicite albeit it would a bit overhead yet since the only mode is: parallel-in with externa syncs. > > + > > + port@1: > > + $ref: /schemas/graph.yaml#/$defs/port-base > > + description: Output port > > + > > + properties: > > + endpoint: > > + $ref: /schemas/media/video-interfaces.yaml# > > + unevaluatedProperties: false > > + > > + properties: > > + data-lanes: > > + minItems: 1 > > + maxItems: 4 > > + > > + clock-noncontinuous: true > > + link-frequencies: true > > + > > + required: > > + - data-lanes > > + - link-frequencies > > + > > + required: > > + - port@0 > > + - port@1 > > + > > +required: > > + - compatible > > + - reg > > + - clocks > > + - clock-names > > + - vddc-supply > > + - vddio-supply > > + - vddmipi-supply > > + - ports > > + > > +additionalProperties: false > > + > > +examples: > > + - | > > + #include <dt-bindings/gpio/gpio.h> > > + > > + i2c { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + > > + csi-bridge@e { > > + compatible = "toshiba,tc358746"; > > + reg = <0xe>; > > + > > + clocks = <&refclk>; > > + clock-names = "refclk"; > > + > > + reset-gpios = <&gpio 2 GPIO_ACTIVE_LOW>; > > + > > + vddc-supply = <&v1_2d>; > > + vddio-supply = <&v1_8d>; > > + vddmipi-supply = <&v1_2d>; > > + > > + /* sensor mclk provider */ > > + #clock-cells = <0>; > > + > > + ports { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + > > + /* Input */ > > + port@0 { > > + reg = <0>; > > + tc358746_in: endpoint { > > + remote-endpoint = <&sensor_out>; > > + }; > > Wrong indentation here. Yes, thanks. Regards, Marco > > + }; > > + > > + /* Output */ > > + port@1 { > > + reg = <1>; > > + tc358746_out: endpoint { > > + remote-endpoint = <&mipi_csi2_in>; > > + data-lanes = <1 2>; > > + clock-noncontinuous; > > + link-frequencies = /bits/ 64 <216000000>; > > + }; > > + }; > > + }; > > + }; > > + }; > > -- > Regards, > > Laurent Pinchart >
