On 08/20/2012 10:45 AM, AnilKumar Ch wrote: > Add Runtime PM support to C_CAN/D_CAN controller. The runtime PM > APIs control clocks for C_CAN/D_CAN IP and prevent access to the > register of C_CAN/D_CAN IP when clock is turned off. > > Signed-off-by: AnilKumar Ch <[email protected]> > --- > This patch has been tested on AM335X EVM. Due to lack of hardware > I am not able to test c_can functionality. I appreciate if anyone > can test c_can functionality with this patch. > > This patch is based on "can-next/master" > > Changes from v7: > - Incorporated Marc's commets on v7 > * changed device pointer to c_can_priv pointer
looks good.
[...]
> --- a/drivers/net/can/c_can/c_can_platform.c
> +++ b/drivers/net/can/c_can/c_can_platform.c
> @@ -32,6 +32,7 @@
> #include <linux/clk.h>
> #include <linux/of.h>
> #include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
>
> #include <linux/can/dev.h>
>
> @@ -177,8 +178,11 @@ static int __devinit c_can_plat_probe(struct
> platform_device *pdev)
> goto exit_free_device;
^^^^^^^^^^^^^^^^
> }
>
> + pm_runtime_enable(&pdev->dev);
> +
> dev->irq = irq;
> priv->base = addr;
> + priv->device = &pdev->dev;
> priv->can.clock.freq = clk_get_rate(clk);
> priv->priv = clk;
>
> @@ -198,6 +202,7 @@ static int __devinit c_can_plat_probe(struct
> platform_device *pdev)
>
> exit_free_device:
> platform_set_drvdata(pdev, NULL);
> + pm_runtime_disable(&pdev->dev);
I think this will end up in a NULL pointer deferf.
> free_c_can_dev(dev);
> exit_iounmap:
> iounmap(addr);
> @@ -226,6 +231,7 @@ static int __devexit c_can_plat_remove(struct
> platform_device *pdev)
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> release_mem_region(mem->start, resource_size(mem));
>
> + pm_runtime_disable(&pdev->dev);
> clk_put(priv->priv);
>
> return 0;
>
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
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