[PATCH] i2c-qoriq: modified compatibility for correct prescaler

[Scott Wood]

On Fri, 2014-10-17 at 11:27 +0200, Valentin Longchamp wrote:
> With "fsl-i2c" compatibility the i2c frequency is not set
> correctly, because it sets no prescaler. According to the AN2919 from
> Freescale and the QorIQ (P2041) documentation, the source clock is 1/2
> the platform clock. This implies that a prescaler of 2 must be used.
> 
> This changes the compatibility of the qoriq-i2c .dtsi files to pick the
> mpc8543, which uses the same driver but sets the correct prescaler.
> 
> Signed-off-by: Rainer Boschung <rainer.boschung at keymile.com>
> Signed-off-by: Valentin Longchamp <valentin.longchamp at keymile.com>
> ---
> 
>  arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi | 4 ++--
>  arch/powerpc/boot/dts/fsl/qoriq-i2c-1.dtsi | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi b/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi
> index 5f9bf7d..aa6c366 100644
> --- a/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi
> +++ b/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi
> @@ -36,7 +36,7 @@ i2c at 118000 {
>  	#address-cells = <1>;
>  	#size-cells = <0>;
>  	cell-index = <0>;
> -	compatible = "fsl-i2c";
> +	compatible = "fsl,mpc8543-i2c", "fsl-i2c";
>  	reg = <0x118000 0x100>;
>  	interrupts = <38 2 0 0>;
>  	dfsrr;
> @@ -46,7 +46,7 @@ i2c at 118100 {
>  	#address-cells = <1>;
>  	#size-cells = <0>;
>  	cell-index = <1>;
> -	compatible = "fsl-i2c";
> +	compatible = "fsl,mpc8543-i2c", "fsl-i2c";
>  	reg = <0x118100 0x100>;
>  	interrupts = <38 2 0 0>;
>  	dfsrr;

Are all chips that use this dtsi 100% compatible with mpc8543's i2c, or
just in ways the Linux driver cares about?

What about fsl,mpc8544-i2c, which has additional special handling in the
driver, but is only used in socrates.dts (not mpc8544ds.dts)?

What about pq3-i2c-*.dtsi?

-Scott