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Date:	Wed, 30 Jul 2014 09:38:23 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	netdev@...r.kernel.org, wg@...ndegger.com,
	linux-can@...r.kernel.org, robh+dt@...nel.org,
	grant.likely@...aro.org, devicetree@...r.kernel.org
CC:	linux-sh@...r.kernel.org, vksavl@...il.com
Subject: Re: [PATCH v2 2/2] rcar_can: add device tree support

On 07/30/2014 12:53 AM, Sergei Shtylyov wrote:
> Add support of the device tree probing for the Renesas R-Car CAN controllers.
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
> 
> ---
> The patch is against the 'linux-can-next.git' repo plus the CAN clock handling
> patch I've just posted.
> 
> Changes in version 2:
> - split the device tree bindings document into a separate patch;
> - replaced 0 with CLKR_CLKP1 in the 'clock_select' variable intializer
> - reversed the condition in the *if* stetement handling the reading of the
>   CAN clock selector from the device tree or the paltfrom data;
> - renamed the "clock-select" property to "renesas,can-clock-select";
> - rebased the patch on top of the CAN clock handling fix.
> 
>  drivers/net/can/rcar_can.c |   33 +++++++++++++++++++++++++--------
>  1 file changed, 25 insertions(+), 8 deletions(-)
> 
> Index: linux-can-next/drivers/net/can/rcar_can.c
> ===================================================================
> --- linux-can-next.orig/drivers/net/can/rcar_can.c
> +++ linux-can-next/drivers/net/can/rcar_can.c
> @@ -20,6 +20,7 @@
>  #include <linux/can/dev.h>
>  #include <linux/clk.h>
>  #include <linux/can/platform/rcar_can.h>
> +#include <linux/of.h>
>  
>  #define RCAR_CAN_DRV_NAME	"rcar_can"
>  
> @@ -738,13 +739,20 @@ static int rcar_can_probe(struct platfor
>  	struct net_device *ndev;
>  	struct resource *mem;
>  	void __iomem *addr;
> +	u32 clock_select = CLKR_CLKP1;

If you introduce the variable clock_select in the patch "rcar_can:
support all input clocks", this diff would be smaller.

>  	int err = -ENODEV;
>  	int irq;
>  
> -	pdata = dev_get_platdata(&pdev->dev);
> -	if (!pdata) {
> -		dev_err(&pdev->dev, "No platform data provided!\n");
> -		goto fail;
> +	if (pdev->dev.of_node) {
> +		of_property_read_u32(pdev->dev.of_node,
> +				     "renesas,can-clock-select", &clock_select);
> +	} else {
> +		pdata = dev_get_platdata(&pdev->dev);
> +		if (!pdata) {
> +			dev_err(&pdev->dev, "No platform data provided!\n");
> +			goto fail;
> +		}
> +		clock_select = pdata->clock_select;
>  	}
>  
>  	irq = platform_get_irq(pdev, 0);
> @@ -776,13 +784,12 @@ static int rcar_can_probe(struct platfor
>  		goto fail_clk;
>  	}
>  
> -	if (pdata->clock_select > CLKR_CLKEXT) {
> +	if (clock_select > CLKR_CLKEXT) {
>  		err = -EINVAL;
>  		dev_err(&pdev->dev, "invalid CAN clock selected\n");
>  		goto fail_clk;
>  	}
> -	priv->can_clk = devm_clk_get(&pdev->dev,
> -				     clock_names[pdata->clock_select]);
> +	priv->can_clk = devm_clk_get(&pdev->dev, clock_names[clock_select]);
>  	if (IS_ERR(priv->can_clk)) {
>  		err = PTR_ERR(priv->can_clk);
>  		dev_err(&pdev->dev, "cannot get CAN clock: %d\n", err);
> @@ -794,7 +801,7 @@ static int rcar_can_probe(struct platfor
>  	ndev->flags |= IFF_ECHO;
>  	priv->ndev = ndev;
>  	priv->regs = addr;
> -	priv->clock_select = pdata->clock_select;
> +	priv->clock_select = clock_select;
>  	priv->can.clock.freq = clk_get_rate(priv->can_clk);
>  	priv->can.bittiming_const = &rcar_can_bittiming_const;
>  	priv->can.do_set_mode = rcar_can_do_set_mode;
> @@ -887,10 +894,20 @@ static int __maybe_unused rcar_can_resum
>  
>  static SIMPLE_DEV_PM_OPS(rcar_can_pm_ops, rcar_can_suspend, rcar_can_resume);
>  
> +static const struct of_device_id rcar_can_of_table[] __maybe_unused = {
> +	{ .compatible = "renesas,can-r8a7778" },
> +	{ .compatible = "renesas,can-r8a7779" },
> +	{ .compatible = "renesas,can-r8a7790" },
> +	{ .compatible = "renesas,can-r8a7791" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, rcar_can_of_table);
> +
>  static struct platform_driver rcar_can_driver = {
>  	.driver = {
>  		.name = RCAR_CAN_DRV_NAME,
>  		.owner = THIS_MODULE,
> +		.of_match_table = of_match_ptr(rcar_can_of_table),
>  		.pm = &rcar_can_pm_ops,
>  	},
>  	.probe = rcar_can_probe,
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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