linux-kernel - Re: [PATCH v3 1/5] dt-bindings: media: adv7604: Add support for i2c_new_secondary

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Date:   Tue, 13 Feb 2018 14:06:51 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Kieran Bingham <kbingham@...nel.org>
Cc:     linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] dt-bindings: media: adv7604: Add support for i2c_new_secondary_device

Hi Kieran,

Thank you for the patch.

On Tuesday, 13 February 2018 00:07:49 EET Kieran Bingham wrote:
> From: Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
> 
> The ADV7604 has thirteen 256-byte maps that can be accessed via the main
> I²C ports. Each map has it own I²C address and acts as a standard slave
> device on the I²C bus.
> 
> Extend the device tree node bindings to be able to override the default
> addresses so that address conflicts with other devices on the same bus
> may be resolved at the board description level.
> 
> Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
> [Kieran: Re-adapted for mainline]
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Reviewed-by: Rob Herring <robh@...nel.org>

Nitpicking, I might not mention i2c_new_secondary_device in the subject, as 
this is a DT bindings change. I don't mind too much though, as long as the 
bindings themselves don't contain Linux-specific information, and they don't, 
so

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> Based upon the original posting :
>   https://lkml.org/lkml/2014/10/22/469
> 
> v2:
>  - DT Binding update separated from code change
>  - Minor reword to commit message to account for DT only change.
>  - Collected Rob's RB tag.
> 
> v3:
>  - Split map register addresses into individual declarations.
> 
>  .../devicetree/bindings/media/i2c/adv7604.txt          | 18
> ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/adv7604.txt
> b/Documentation/devicetree/bindings/media/i2c/adv7604.txt index
> 9cbd92eb5d05..ebb5f070c05b 100644
> --- a/Documentation/devicetree/bindings/media/i2c/adv7604.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/adv7604.txt
> @@ -13,7 +13,11 @@ Required Properties:
>      - "adi,adv7611" for the ADV7611
>      - "adi,adv7612" for the ADV7612
> 
> -  - reg: I2C slave address
> +  - reg: I2C slave addresses
> +    The ADV76xx has up to thirteen 256-byte maps that can be accessed via
> the +    main I²C ports. Each map has it own I²C address and acts as a
> standard +    slave device on the I²C bus. The main address is mandatory,
> others are +    optional and revert to defaults if not specified.
> 
>    - hpd-gpios: References to the GPIOs that control the HDMI hot-plug
>      detection pins, one per HDMI input. The active flag indicates the GPIO
> @@ -35,6 +39,11 @@ Optional Properties:
> 
>    - reset-gpios: Reference to the GPIO connected to the device's reset pin.
> - default-input: Select which input is selected after reset.
> +  - reg-names : Names of maps with programmable addresses.
> +		It can contain any map needing a non-default address.
> +		Possible maps names are :
> +		  "main", "avlink", "cec", "infoframe", "esdp", "dpp", "afe",
> +		  "rep", "edid", "hdmi", "test", "cp", "vdp"
> 
>  Optional Endpoint Properties:
> 
> @@ -52,7 +61,12 @@ Example:
> 
>  	hdmi_receiver@4c {
>  		compatible = "adi,adv7611";
> -		reg = <0x4c>;
> +		/*
> +		 * The edid page will be accessible @ 0x66 on the i2c bus. All
> +		 * other maps will retain their default addresses.
> +		 */
> +		reg = <0x4c>, <0x66>;
> +		reg-names "main", "edid";
> 
>  		reset-gpios = <&ioexp 0 GPIO_ACTIVE_LOW>;
>  		hpd-gpios = <&ioexp 2 GPIO_ACTIVE_HIGH>;


-- 
Regards,

Laurent Pinchart