Re: [PATCH 1/3] ARM: OMAP: omap_device: keep track of driver bound status

[Paul Walmsley <paul@xxxxxxxxx>]

Hi Kevin

a couple of minor comments

On Tue, 10 Jul 2012, Kevin Hilman wrote:

> Use the bus notifier to keep track of driver bound status by adding a
> new internal field to struct omap_device: _driver_staus.

"_driver_status"

> This will be useful for follow-up patches which need to know whether
> or not a driver is bound in order to make intelligent omap_device
> enable/idle decisions.
> 
> Cc: Paul Walmsley <paul@xxxxxxxxx>
> Signed-off-by: Kevin Hilman <khilman@xxxxxx>
> ---
>  arch/arm/plat-omap/include/plat/omap_device.h |    2 ++
>  arch/arm/plat-omap/omap_device.c              |   14 +++++++++-----
>  2 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
> index 4327b2c..e0486cb 100644
> --- a/arch/arm/plat-omap/include/plat/omap_device.h
> +++ b/arch/arm/plat-omap/include/plat/omap_device.h
> @@ -60,6 +60,7 @@ extern struct dev_pm_domain omap_device_pm_domain;
>   * @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
>   * @_state: one of OMAP_DEVICE_STATE_* (see above)
>   * @flags: device flags
> + * @_driver_status: one of BUS_NOTIFY_*_DRIVER from <linux/device.h>
>   *
>   * Integrates omap_hwmod data into Linux platform_device.
>   *
> @@ -78,6 +79,7 @@ struct omap_device {
>  	u8				hwmods_cnt;
>  	u8				_state;
>  	u8                              flags;
> +	u8				_driver_status;
>  };
>  
>  /* Device driver interface (call via platform_data fn ptrs) */
> diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
> index c490240..1d1b5ff 100644
> --- a/arch/arm/plat-omap/omap_device.c
> +++ b/arch/arm/plat-omap/omap_device.c
> @@ -385,17 +385,21 @@ static int _omap_device_notifier_call(struct notifier_block *nb,
>  				      unsigned long event, void *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
> +	struct omap_device *od;
>  
>  	switch (event) {
> -	case BUS_NOTIFY_ADD_DEVICE:
> -		if (pdev->dev.of_node)
> -			omap_device_build_from_dt(pdev);
> -		break;
> -
>  	case BUS_NOTIFY_DEL_DEVICE:
>  		if (pdev->archdata.od)
>  			omap_device_delete(pdev->archdata.od);
>  		break;
> +	case BUS_NOTIFY_ADD_DEVICE:
> +		if (pdev->dev.of_node)
> +			omap_device_build_from_dt(pdev);
> +		/* fall through */
> +	default:
> +		od = to_omap_device(pdev);
> +		if (od)
> +			od->_driver_status = event;

_driver_status is a u8, but event is an unsigned long.  Might be worth 
adding a WARN() to complain if event is greater than (2^8)-1.

>  	}
>  
>  	return NOTIFY_DONE;
> -- 
> 1.7.9.2
> 


- Paul
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