[PATCHv2 2/2] OMAP: add omap_device_reset()

[b-cousson@ti.com (Cousson, Benoit)]

Hi Tomi,

On 5/27/2011 9:38 AM, Valkeinen, Tomi wrote:
> Add omap_device_reset() function which can be used to reset the hwmods
> associated with the given platform device.

We've never exposed it because we are trying to avoid that any driver 
play with asynchronous HW reset. That can lead to undefined HW behavior :-(

Do you have some strong need for that?

Regards,
Benoit

>
> Signed-off-by: Tomi Valkeinen<tomi.valkeinen@ti.com>
> ---
>   arch/arm/plat-omap/include/plat/omap_device.h |    1 +
>   arch/arm/plat-omap/omap_device.c              |   23 +++++++++++++++++++++++
>   2 files changed, 24 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
> index 70d31d0..bcf1b35 100644
> --- a/arch/arm/plat-omap/include/plat/omap_device.h
> +++ b/arch/arm/plat-omap/include/plat/omap_device.h
> @@ -108,6 +108,7 @@ int omap_device_align_pm_lat(struct platform_device *pdev,
>   			     u32 new_wakeup_lat_limit);
>   struct powerdomain *omap_device_get_pwrdm(struct omap_device *od);
>   int omap_device_get_context_loss_count(struct platform_device *pdev);
> +int omap_device_reset(struct platform_device *pdev);
>
>   /* Other */
>
> diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
> index 9753f71..4e6fc1b 100644
> --- a/arch/arm/plat-omap/omap_device.c
> +++ b/arch/arm/plat-omap/omap_device.c
> @@ -324,6 +324,29 @@ int omap_device_get_context_loss_count(struct platform_device *pdev)
>   }
>
>   /**
> + * omap_device_reset - reset hwmods of given device
> + * @pdev: struct platform_device *
> + *
> + * Reset all hwmods associated with the given device. If a reset of a hwmod
> + * fails the rest of the hwmods are skipped and the error is returned.
> + */
> +int omap_device_reset(struct platform_device *pdev)
> +{
> +	struct omap_device *od;
> +	int i, r;
> +
> +	od = _find_by_pdev(pdev);
> +
> +	for (i = 0; i<  od->hwmods_cnt; i++) {
> +		r = omap_hwmod_reset(od->hwmods[i]);
> +		if (r)
> +			return r;
> +	}
> +
> +	return 0;
> +}
> +
> +/**
>    * omap_device_count_resources - count number of struct resource entries needed
>    * @od: struct omap_device *
>    *