[PATCH] MXS: Add DT binding support into stmp3xxx-rtc

[Shawn Guo]

On Sun, May 27, 2012 at 04:11:29AM +0200, Marek Vasut wrote:
> Add simple binding for the stmp3xxx-rtc.
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Alessandro Zummo <a.zummo at towertech.it>
> Cc: devicetree-discuss at lists.ozlabs.org
> Cc: Grant Likely <grant.likely at secretlab.ca>
> Cc: Rob Herring <rob.herring at calxeda.com>
> Cc: rtc-linux at googlegroups.com
> Cc: Shawn Guo <shawn.guo at linaro.org>
> ---
>  .../devicetree/bindings/rtc/stmp3xxx-rtc.txt       |   20 ++++++++++++++++++++
>  arch/arm/boot/dts/imx28.dtsi                       |    1 +
>  drivers/rtc/rtc-stmp3xxx.c                         |    8 ++++++++
>  3 files changed, 29 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt
> 
> diff --git a/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt
> new file mode 100644
> index 0000000..a49dd52
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt
> @@ -0,0 +1,20 @@
> +* STMP3xxx/i.MX28 Time Clock controller
> +
> +Required properties:
> +- compatible: should be one of the following.
> +    * "fsl,stmp3xxx-rtc"
> +    * "fsl,imx28-rtc"
> +- reg: physical base address of the controller and length of memory mapped
> +  region.
> +- interrupts: Two interrupt numbers to the cpu should be specified. First
> +  interrupt number is the rtc rick interupt and second interrupt number

s/rick/tick?

> +  is the rtc alarm interrupt. The number of cells representing a interrupt
> +  depends on the parent interrupt controller.
> +
> +Example:
> +
> +	rtc at 80056000 {
> +		compatible = "fsl,imx28-rtc";
> +		reg = <0x80056000 2000>;
> +		interrupts = <28 29>;
> +	};
> diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
> index d470276..119f183 100644
> --- a/arch/arm/boot/dts/imx28.dtsi
> +++ b/arch/arm/boot/dts/imx28.dtsi
> @@ -370,6 +370,7 @@
>  			};
>  
>  			rtc at 80056000 {
> +				compatible = "fsl,imx28-rtc";
>  				reg = <0x80056000 2000>;
>  				interrupts = <28 29>;
>  				status = "disabled";
> diff --git a/drivers/rtc/rtc-stmp3xxx.c b/drivers/rtc/rtc-stmp3xxx.c
> index 1028786..dea9764 100644
> --- a/drivers/rtc/rtc-stmp3xxx.c
> +++ b/drivers/rtc/rtc-stmp3xxx.c
> @@ -25,6 +25,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/rtc.h>
>  #include <linux/slab.h>
> +#include <linux/of_device.h>
>  
>  #include <mach/common.h>
>  
> @@ -265,6 +266,12 @@ static int stmp3xxx_rtc_resume(struct platform_device *dev)
>  #define stmp3xxx_rtc_resume	NULL
>  #endif
>  
> +static const struct of_device_id rtc_dt_ids[] = {
> +	{ .compatible = "fsl,stmp3xxx-rtc", },
> +	{ .compatible = "fsl,imx28-rtc", },

If we do not have any tweaking in the driver between stmp3xxx-rtc and
imx28-rtc, that means imx28-rtc is compatible with stmp3xxx-rtc.  That
said, we only need stmp3xxx-rtc in this of_device_id table, and having
the following line in imx28 dts will just work for imx28.

	compatible = "fsl,imx28-rtc", "stmp3xxx-rtc";

Regards,
Shawn

> +	{ /* sentinel */ }
> +};
> +
>  static struct platform_driver stmp3xxx_rtcdrv = {
>  	.probe		= stmp3xxx_rtc_probe,
>  	.remove		= stmp3xxx_rtc_remove,
> @@ -273,6 +280,7 @@ static struct platform_driver stmp3xxx_rtcdrv = {
>  	.driver		= {
>  		.name	= "stmp3xxx-rtc",
>  		.owner	= THIS_MODULE,
> +		.of_match_table = rtc_dt_ids,
>  	},
>  };
>  
> -- 
> 1.7.10
>