Subject: [PATCH] ARM: OMAP2+: gpmc-smsc911x: only register regulator for first instance

From: [email-masked] (Tony Lindgren)
Date: Tue, 6 Mar 2012 16:44:05 -0800

* Kevin Hilman <[email-masked]> [120306 16:07]:
> commit e4b0b2cbbb (ARM: OMAP2+: gpmc-smsc911x: add required smsc911x
> regulators) added regulators which are registered during
> gpmc_smsc911x_init().  However, some platforms (OMAP3/Overo) have more
> than one instance of the SMSC911x and result in attempting to register
> the same regulator more than once which causes a panic().
> 
> Fix this by only registering the regulator when the platform_data id
> field is zero, indicating its the first instance.
> 
> Cc: Matt Porter <[email-masked]>
> Signed-off-by: Kevin Hilman <[email-masked]>
> ---
> Fix needed for v3.3.
> Applies on top of Tony's fixes branch.
> 
>  arch/arm/mach-omap2/gpmc-smsc911x.c |   11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/gpmc-smsc911x.c b/arch/arm/mach-omap2/gpmc-smsc911x.c
> index bbb870c..4d6f1c6 100644
> --- a/arch/arm/mach-omap2/gpmc-smsc911x.c
> +++ b/arch/arm/mach-omap2/gpmc-smsc911x.c
> @@ -101,10 +101,13 @@ void __init gpmc_smsc911x_init(struct omap_smsc911x_platform_data *board_data)
>  
>  	gpmc_cfg = board_data;
>  
> -	ret = platform_device_register(&gpmc_smsc911x_regulator);
> -	if (ret < 0) {
> -		pr_err("Unable to register smsc911x regulators: %d\n", ret);
> -		return;
> +	if (!gpmc_cfg) {

Shouldn't this be !gpmc_cfg->id instead..

> +		ret = platform_device_register(&gpmc_smsc911x_regulator);
> +		if (ret < 0) {
> +			pr_err("Unable to register smsc911x regulators: %d\n",
> +			       ret);
> +			return;
> +		}
>  	}
>  
>  	if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {

..because we have gpmc_cfg always passed to gpmc_smsc911x_init().

Regards,

Tony