linux-kernel - Re: [PATCH] ASoC: tda998x: Fix lack of required reg in DT documentation

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Date:	Thu, 20 Mar 2014 13:32:24 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Jean-Francois Moine <moinejf@...e.fr>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	devicetree@...r.kernel.org
CC:	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: tda998x: Fix lack of required reg in DT documentation

On 03/20/2014 09:58 AM, Jean-Francois Moine wrote:
> The I2C address (reg) is required for the TDA998x driver to be loaded
> and initialized.
>
> Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
> ---
> This patch applies to linux-next.
> ---
>   Documentation/devicetree/bindings/drm/i2c/tda998x.txt | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
> index d7df01c..fc7effa 100644
> --- a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
> +++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
> @@ -3,6 +3,8 @@ Device-Tree bindings for the NXP TDA998x HDMI transmitter
>   Required properties;
>     - compatible: must be "nxp,tda998x"
>
> +  - reg: I2C address - must be <0x70>

TDA9983b datasheet says:

"Bits A0 and A1 of the I2C-bus device address are externally selected
by pins A0 and A1."

Therefore, 0x70, 0x71, 0x72, and 0x73 are valid i2c addresses.

Sebastian

>   Optional properties:
>     - interrupts: interrupt number and trigger type
>   	default: polling
>

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