linux-kernel - Re: [PATCH v4 2/5] dt-bindings: adv7511: Extend bindings to allow specifying slave map addresses

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Message-ID: <aeef36f9-cd59-2b83-829e-8b0c3127b838@codeaurora.org>
Date:   Wed, 25 Apr 2018 12:46:04 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Kieran Bingham <kbingham@...nel.org>, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-renesas-soc@...r.kernel.org
Cc:     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>
Subject: Re: [PATCH v4 2/5] dt-bindings: adv7511: Extend bindings to allow
 specifying slave map addresses



On Tuesday 13 February 2018 11:18 PM, Kieran Bingham wrote:
> From: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> 
> The ADV7511 has four 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.
> 

Queued to drm-misc-next

> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
> v2:
>   - Fixed up reg: property description to account for multiple optional
>     addresses.
>   - Minor reword to commit message to account for DT only change
>   - Collected Robs RB tag
> 
> v3:
>   - Split map register addresses into individual declarations.
> 
> v4:
>   - Update commit title
>   - Collect Laurent's RB tag
>   - Fix nitpickings
>   - Normalise I2C usage (I²C is harder to grep for)
> 
>   .../devicetree/bindings/display/bridge/adi,adv7511.txt | 18 ++++++++++++++++--
>   1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> index 0047b1394c70..2c887536258c 100644
> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> @@ -14,7 +14,13 @@ Required properties:
>   		"adi,adv7513"
>   		"adi,adv7533"
>   
> -- reg: I2C slave address
> +- reg: I2C slave addresses
> +  The ADV7511 internal registers are split into four pages exposed through
> +  different I2C addresses, creating four register maps. 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.
> +
>   
>   The ADV7511 supports a large number of input data formats that differ by their
>   color depth, color format, clock mode, bit justification and random
> @@ -70,6 +76,9 @@ Optional properties:
>     rather than generate its own timings for HDMI output.
>   - clocks: from common clock binding: reference to the CEC clock.
>   - clock-names: from common clock binding: must be "cec".
> +- reg-names : Names of maps with programmable addresses.
> +	It can contain any map needing a non-default address.
> +	Possible maps names are : "main", "edid", "cec", "packet"
>   
>   Required nodes:
>   
> @@ -88,7 +97,12 @@ Example
>   
>   	adv7511w: hdmi@39 {
>   		compatible = "adi,adv7511w";
> -		reg = <39>;
> +		/*
> +		 * The EDID page will be accessible on address 0x66 on the I2C
> +		 * bus. All other maps continue to use their default addresses.
> +		 */
> +		reg = <0x39>, <0x66>;
> +		reg-names = "main", "edid";
>   		interrupt-parent = <&gpio3>;
>   		interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
>   		clocks = <&cec_clock>;
>