[PATCH 1/2] arm/mx5: parse iomuxc pad configuratoin from device tree

[s.hauer@pengutronix.de (Sascha Hauer)]

On Mon, Jul 25, 2011 at 11:07:46PM +0800, Shawn Guo wrote:
> It adds function mxc_iomuxc_dt_init() to parse iomuxc pad configuration
> from device tree.
> 
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> Cc: Grant Likely <grant.likely@secretlab.ca>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  .../devicetree/bindings/arm/fsl/iomuxc.txt         |   47 +++++++++++++
>  arch/arm/mach-mx5/Makefile                         |    2 +
>  arch/arm/mach-mx5/iomuxc-dt.c                      |   72 ++++++++++++++++++++
>  arch/arm/plat-mxc/include/mach/common.h            |    3 +
>  4 files changed, 124 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/fsl/iomuxc.txt
>  create mode 100644 arch/arm/mach-mx5/iomuxc-dt.c
> 
> diff --git a/Documentation/devicetree/bindings/arm/fsl/iomuxc.txt b/Documentation/devicetree/bindings/arm/fsl/iomuxc.txt
> new file mode 100644
> index 0000000..ae9292b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/fsl/iomuxc.txt
> @@ -0,0 +1,47 @@
> +* Freescale i.MX IOMUX Controller (IOMUXC)
> +
> +Required properties:
> +- compatible : "fsl,<soc>-iomuxc";
> +
> +Sub-nodes present individual PAD configuration, and node name is the
> +PAD name given by hardware document.
> +
> +Required properties:
> +- reg : Should contain the offset of registers
> +  IOMUXC_SW_MUX_CTL_PAD_<pad-name> and IOMUXC_SW_PAD_CTL_PAD_<pad-name>.
> +- fsl,iomuxc-mux-mode : Should specify the MUX_MODE setting of register
> +  IOMUXC_SW_MUX_CTL_PAD_<pad-name>.
> +
> +Optional properties:
> +- fsl,iomuxc-sion : Indicates that bit SION of register
> +  IOMUXC_SW_MUX_CTL_PAD_<pad-name> needs to be set for given MUX_MODE
> +  setting of the PAD.
> +- fsl,iomuxc-select-input : Specify the offset of register
> +  IOMUXC_<...>_SELECT_INPUT and the value of bit-field DAISY for given
> +  MUX_MODE setting of the PAD.
> +
> +Examples:
> +
> +iomuxc at 53fa8000 {
> +	#address-cells = <2>;
> +	#size-cells = <0>;
> +	compatible = "fsl,imx53-iomuxc";
> +	reg = <0x53fa8000 0x4000>;
> +
> +	/*
> +	 * I2C2
> +	 */
> +	key-col3 { /* I2C2_SCL */
> +		reg = <0x3c 0x364>;
> +		fsl,iomuxc-mux-mode = <4>;
> +		fsl,iomuxc-sion;
> +		fsl,iomuxc-select-input = <0x81c 0x0>;
> +	};
> +
> +	key-row3 { /* I2C2_SDA */
> +		reg = <0x40 0x368>;
> +		fsl,iomuxc-mux-mode = <4>;
> +		fsl,iomuxc-sion;
> +		fsl,iomuxc-select-input = <0x820 0x0>;
> +	};
> +};

If we want to move the iomux setting to the device tree, wouldn't it be
necessary to find some format which can be shared across different
platforms? At least all i.MXs should be covered.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |