[PATCH 4/4] MXS-MMC: Add wp-inverted property

[Marek Vasut]

Dear Lothar Waßmann,

> Hi,
> 
> Marek Vasut writes:
> > The write-protect GPIO is inverted on some boards. Handle such case.
> > 
> > Signed-off-by: Marek Vasut <marex at denx.de>
> > Cc: Shawn Guo <shawn.guo at linaro.org>
> > Cc: Fabio Estevam <fabio.estevam at freescale.com>
> > ---
> > 
> >  Documentation/devicetree/bindings/mmc/mxs-mmc.txt |    1 +
> >  drivers/mmc/host/mxs-mmc.c                        |   11 ++++++++++-
> >  2 files changed, 11 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
> > b/Documentation/devicetree/bindings/mmc/mxs-mmc.txt index
> > 14d870a..0a7d2cd 100644
> > --- a/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
> > +++ b/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
> > 
> > @@ -13,6 +13,7 @@ Required properties:
> >  Optional properties:
> >  - wp-gpios: Specify GPIOs for write protection
> > 
> > +- wp-inverted: Set if the write protection GPIO is inverted
> > 
> >  Examples:
> > diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
> > index 277161d..119beb9 100644
> > --- a/drivers/mmc/host/mxs-mmc.c
> > +++ b/drivers/mmc/host/mxs-mmc.c
> > @@ -164,16 +164,23 @@ struct mxs_mmc_host {
> > 
> >  	spinlock_t			lock;
> >  	int				sdio_irq_en;
> >  	int				wp_gpio;
> > 
> > +	int				wp_inverted:1;
> > 
> >  };
> >  
> >  static int mxs_mmc_get_ro(struct mmc_host *mmc)
> >  {
> >  
> >  	struct mxs_mmc_host *host = mmc_priv(mmc);
> > 
> > +	int ret;
> > 
> >  	if (!gpio_is_valid(host->wp_gpio))
> >  	
> >  		return -EINVAL;
> > 
> > -	return gpio_get_value(host->wp_gpio);
> > +	ret = gpio_get_value(host->wp_gpio);
> > +
> > +	if (host->wp_inverted)
> > +		ret = !ret;
> > +
> > +	return ret;
> > 
> >  }
> >  
> >  static int mxs_mmc_get_cd(struct mmc_host *mmc)
> > 
> > @@ -786,6 +793,8 @@ static int mxs_mmc_probe(struct platform_device
> > *pdev)
> > 
> >  		else if (bus_width == 8)
> >  		
> >  			mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
> >  		
> >  		host->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
> > 
> > +		if (of_find_property(np, "wp-inverted", NULL))
> > +			host->wp_inverted = 1;
> 
> Why not simply specify the GPIO in question as being active-low in the
> GPIO definition and use of_get_named_gpio_flags()?

Just followed the cd-inverted pattern. Thanks for the hint, will poke into it.

> 
> Lothar Waßmann

Best regards,
Marek Vasut