linux-kernel - Re: [PATCH v4 3/5] rtc: omap: dt support

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Message-ID: <5084523F.2070800@gmail.com>
Date:	Sun, 21 Oct 2012 21:51:27 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Afzal Mohammed <afzal@...com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>, Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...com>,
	Russell King <linux@....linux.org.uk>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	linux-arm-kernel@...ts.infradead.org, rtc-linux@...glegroups.com
Subject: Re: [PATCH v4 3/5] rtc: omap: dt support

On 19.10.2012 11:59, Afzal Mohammed wrote:
> enhance rtc-omap driver with DT capability
> 
> Signed-off-by: Afzal Mohammed <afzal@...com>
> Acked-by: Sekhar Nori <nsekhar@...com>
> ---
> 
> v4:
>  Proper devicetree documentation
> 
> v2:
>  Use compatible as ti,da830-rtc instead of ti,am1808-rtc
> 
>  Documentation/devicetree/bindings/rtc/rtc-omap.txt | 17 +++++++++++++++++
>  drivers/rtc/rtc-omap.c                             | 18 ++++++++++++++++++
>  2 files changed, 35 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/rtc-omap.txt
> 
> diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
> new file mode 100644
> index 0000000..b47aa41
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
> @@ -0,0 +1,17 @@
> +TI Real Time Clock
> +
> +Required properties:
> +- compatible: "ti,da830-rtc"
> +- reg: Address range of rtc register set
> +- interrupts: rtc timer, alarm interrupts in order
> +- interrupt-parent: phandle for the interrupt controller
> +
> +Example:
> +
> +rtc@...3000 {
> +	compatible = "ti,da830-rtc";
> +	reg = <0x23000 0x1000>;
> +	interrupts = <19
> +		      19>;
> +	interrupt-parent = <&intc>;
> +};
> diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
> index d948426..dff9ff4 100644
> --- a/drivers/rtc/rtc-omap.c
> +++ b/drivers/rtc/rtc-omap.c
> @@ -20,6 +20,8 @@
>  #include <linux/rtc.h>
>  #include <linux/bcd.h>
>  #include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>  
>  #include <asm/io.h>
>  
> @@ -298,6 +300,8 @@ static struct rtc_class_ops omap_rtc_ops = {
>  static int omap_rtc_alarm;
>  static int omap_rtc_timer;
>  
> +#define	OMAP_RTC_DATA_DA830_IDX	1
> +
>  static struct platform_device_id omap_rtc_devtype[] = {
>  	{
>  		.name	= DRIVER_NAME,
> @@ -309,12 +313,25 @@ static struct platform_device_id omap_rtc_devtype[] = {
>  };
>  MODULE_DEVICE_TABLE(platform, omap_rtc_devtype);
>  
> +static const struct of_device_id omap_rtc_of_match[] = {
> +	{	.compatible	= "ti,da830-rtc",
> +		.data		= &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],

Wouldn't it make sense to list all the compatible models here? The
advantage of a compatible list is that we can name the models
explicitly, or maybe at least "davinci-rtc". Is there any reason for
this particular name?



Daniel


> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
> +
>  static int __init omap_rtc_probe(struct platform_device *pdev)
>  {
>  	struct resource		*res, *mem;
>  	struct rtc_device	*rtc;
>  	u8			reg, new_ctrl;
>  	const struct platform_device_id *id_entry;
> +	const struct of_device_id *of_id;
> +
> +	of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
> +	if (of_id)
> +		pdev->id_entry = of_id->data;
>  
>  	omap_rtc_timer = platform_get_irq(pdev, 0);
>  	if (omap_rtc_timer <= 0) {
> @@ -510,6 +527,7 @@ static struct platform_driver omap_rtc_driver = {
>  	.driver		= {
>  		.name	= DRIVER_NAME,
>  		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(omap_rtc_of_match),
>  	},
>  	.id_table	= omap_rtc_devtype,
>  };
> 

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