linux-kernel - Re: [PATCH 3/3] ARM: shmobile: r8a7790: rework dts to use i2c demuxer

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Message-ID: <5696870C.102@cogentembedded.com>
Date:	Wed, 13 Jan 2016 20:19:08 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org
Cc:	devicetree@...r.kernel.org, linux-sh@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Jan Luebbe <jlu@...gutronix.de>
Subject: Re: [PATCH 3/3] ARM: shmobile: r8a7790: rework dts to use i2c demuxer

On 01/13/2016 05:29 PM, Wolfram Sang wrote:

> From: Wolfram Sang <wsa+renesas@...g-engineering.com>
>
> Create a seperate bus for HDMI related I2C slaves and assign it

    Separate.

> to a i2c-gpio master. It can be switched to the i2c-rcar or
> i2c-sh_mobile core at runtime.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
>
> After the technical details of the underlying driver seem to be more or less
> sorted out, I would appreciate some discussion here about changing the Lager
> DTS e.g. if we really want GPIO to be the default?
>
>   arch/arm/boot/dts/r8a7790-lager.dts | 141 ++++++++++++++++++++++--------------
>   1 file changed, 88 insertions(+), 53 deletions(-)
>
> diff --git a/arch/arm/boot/dts/r8a7790-lager.dts b/arch/arm/boot/dts/r8a7790-lager.dts
> index c553abd711eeb3..d8f0ca8e094dad 100644
> --- a/arch/arm/boot/dts/r8a7790-lager.dts
> +++ b/arch/arm/boot/dts/r8a7790-lager.dts
[...]
> @@ -252,6 +254,79 @@
>   		#clock-cells = <0>;
>   		clock-frequency = <148500000>;
>   	};
> +
> +
> +	gpioi2c: i2c@9 {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		compatible = "i2c-gpio";

    I think this prop should go first.

> +		status = "disabled";

    In a board file? When do you intend to enable it?

> +		gpios = <&gpio5 6 GPIO_ACTIVE_HIGH /* sda */
> +			 &gpio5 5 GPIO_ACTIVE_HIGH /* scl */
> +			>;
> +		i2c-gpio,delay-us = <5>;
> +	};
[...]

MBR, Sergei