linux-kernel - Re: [PATCH 04/10] Staging: fbtft: Use a helper function to set write

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Date:	Tue, 14 Jul 2015 19:13:27 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Fabio Falzoi <fabio.falzoi84@...il.com>
Cc:	thomas.petazzoni@...e-electrons.com, noralf@...nnes.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/10] Staging: fbtft: Use a helper function to set
 write_register op

On Tue, Jun 30, 2015 at 08:43:11AM +0200, Fabio Falzoi wrote:
> Use a helper function to set the correct write_register function, based
> on the width of the registers.
> 
> Signed-off-by: Fabio Falzoi <fabio.falzoi84@...il.com>
> ---
>  drivers/staging/fbtft/flexfb.c | 36 ++++++++++++++++++++++--------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/staging/fbtft/flexfb.c b/drivers/staging/fbtft/flexfb.c
> index 25b394d..dae092a 100644
> --- a/drivers/staging/fbtft/flexfb.c
> +++ b/drivers/staging/fbtft/flexfb.c
> @@ -363,6 +363,25 @@ static int flexfb_chip_init(const struct device *dev)
>  	return -EINVAL;
>  }
>  
> +static int flexfb_set_regwrite_func(const struct device *dev,
> +				    struct fbtft_par *par)
> +{
> +	switch (regwidth) {
> +	case 8:
> +		par->fbtftops.write_register = fbtft_write_reg8_bus8;
> +		break;
> +	case 16:
> +		par->fbtftops.write_register = fbtft_write_reg16_bus8;
> +		break;
> +	default:
> +		dev_err(dev, "argument 'regwidth': %d is not supported.\n",
> +			regwidth);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static int flexfb_probe_common(struct spi_device *sdev,
>  			       struct platform_device *pdev)
>  {
> @@ -413,20 +432,9 @@ static int flexfb_probe_common(struct spi_device *sdev,
>  		par->init_sequence = initp;
>  	par->fbtftops.init_display = fbtft_init_display;
>  
> -	/* registerwrite functions */
> -	switch (regwidth) {
> -	case 8:
> -		par->fbtftops.write_register = fbtft_write_reg8_bus8;
> -		break;
> -	case 16:
> -		par->fbtftops.write_register = fbtft_write_reg16_bus8;
> -		break;
> -	default:
> -		dev_err(dev,
> -			"argument 'regwidth': %d is not supported.\n",
> -			regwidth);
> -		return -EINVAL;
> -	}
> +	ret = flexfb_set_regwrite_func(dev, par);
> +	if (ret)
> +		goto out_release;
>  
>  	/* bus functions */
>  	if (sdev) {

Why?  You aren't calling this function anywhere else, so why move it?

thanks,

greg k-h
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