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    Subject[RFC,v2 4/6] media: dt-bindings: add DS90UB953-Q1 video serializer
    Date
    Describe the Texas Instruments DS90UB953-Q1, a video serializer with remote
    access to I2C and GPIOs.

    Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>

    ---

    Changes RFCv1 -> RFCv2: none, this patch is new in RFCv2
    ---
    .../bindings/media/i2c/ti,ds90ub953-q1.txt | 42 +++++++++++++++++++
    include/dt-bindings/media/ds90ub953.h | 16 +++++++
    2 files changed, 58 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/media/i2c/ti,ds90ub953-q1.txt
    create mode 100644 include/dt-bindings/media/ds90ub953.h

    diff --git a/Documentation/devicetree/bindings/media/i2c/ti,ds90ub953-q1.txt b/Documentation/devicetree/bindings/media/i2c/ti,ds90ub953-q1.txt
    new file mode 100644
    index 000000000000..ba24f887b607
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/media/i2c/ti,ds90ub953-q1.txt
    @@ -0,0 +1,42 @@
    +Texas Instruments DS90UB953-Q1 video serializer
    +===============================================
    +
    +The TI DS90UB953-Q1 is a MIPI CSI-2 video serializer that forwards a MIPI
    +CSI-2 input video stream over an FPD Link 3 connection to a remote
    +deserializer. It also allows access to I2C and GPIO from the deserializer.
    +
    +The DT definitions can be found in include/dt-bindings/media/ds90ub953.h
    +
    +When used as a the remote counterpart of a deserializer (e.g. the
    +DS90UB954-Q1), the serializer is described in the
    +"deserializer/ports/port@<N>/endpoint/remote-chip" node.
    +
    +Required properties:
    +
    + - compatible: must be "ti,ds90ub953-q1"
    +
    +Optional properties:
    +
    + - gpio-functions: a list of 4 values defining how the 4 GPIO pins are
    + connected in hardware; possible values are:
    + - DS90_GPIO_FUNC_UNUSED (0): the GPIO is not connected
    + - DS90_GPIO_FUNC_INPUT (1): the GPIO is an input to the ds90ub953
    + - DS90_GPIO_FUNC_OUTPUT_REMOTE (2): the GPIO is an output from the
    + ds90ub953, to be driven from the remote chip (deserializer)
    +
    + - ti,ds90ub953-q1-clk-inv-pol-quirk: the MIPI CSI-2 input clock lane has
    + inverted polarity
    +
    +
    +Device node example
    +-------------------
    +
    +&ds90ub954_fpd3_in0 {
    + remote-chip {
    + compatible = "ti,ds90ub953-q1";
    + gpio-functions = <DS90_GPIO_FUNC_OUTPUT_REMOTE
    + DS90_GPIO_FUNC_OUTPUT_REMOTE
    + DS90_GPIO_FUNC_UNUSED
    + DS90_GPIO_FUNC_UNUSED>;
    + };
    +};
    diff --git a/include/dt-bindings/media/ds90ub953.h b/include/dt-bindings/media/ds90ub953.h
    new file mode 100644
    index 000000000000..5359432968e9
    --- /dev/null
    +++ b/include/dt-bindings/media/ds90ub953.h
    @@ -0,0 +1,16 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +/**
    + * Definitions for the Texas Instruments DS90UB953-Q1 video serializer
    + *
    + * Copyright (c) 2019 Luca Ceresoli <luca@lucaceresoli.net>
    + */
    +
    +#ifndef _DS90UB953_H
    +#define _DS90UB953_H
    +
    +#define DS90_GPIO_FUNC_UNUSED 0
    +#define DS90_GPIO_FUNC_INPUT 1
    +#define DS90_GPIO_FUNC_OUTPUT_REMOTE 2
    +#define DS90_GPIO_N_FUNCS 3
    +
    +#endif /* _DS90UB953_H */
    --
    2.17.1
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