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Re: [PATCH v2 8/8] Input: olpc_apsp: allocate the GPIOs used




On Wed, Oct 10, 2018 at 10:10:13AM -0700, Dmitry Torokhov wrote:
> On Wed, Oct 10, 2018 at 04:25:04PM +0200, Lubomir Rintel wrote:
> > Take the GPIO lines are used by the SP. The driver doesn't touch the
> > lines -- this is done to disallow anything else from fiddling with
> > them because that would confuse the SP firmware.
> > 
> > Also, the lines are now nicely visible in /sys/kernel/debug/gpio.
> 
> Linus, is this something that should be handled by GPIO "hogs"?

Argh, meant to add Linus Walleij here.

> 
> > 
> > Signed-off-by: Lubomir Rintel <lkundrak@xxxxx>
> > ---
> >  drivers/input/serio/olpc_apsp.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> > 
> > diff --git a/drivers/input/serio/olpc_apsp.c b/drivers/input/serio/olpc_apsp.c
> > index fe9e19014e70..287759c5f36d 100644
> > --- a/drivers/input/serio/olpc_apsp.c
> > +++ b/drivers/input/serio/olpc_apsp.c
> > @@ -24,6 +24,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/delay.h>
> >  #include <linux/clk.h>
> > +#include <linux/gpio/consumer.h>
> >  
> >  /*
> >   * The OLPC XO-1.75 and XO-4 laptops do not have a hardware PS/2 controller.
> > @@ -76,6 +77,8 @@ struct olpc_apsp {
> >  	struct serio *padio;
> >  	void __iomem *base;
> >  	struct clk *clk;
> > +	struct gpio_desc *clk_gpio;
> > +	struct gpio_desc *data_gpio;
> >  	int open_count;
> >  	int irq;
> >  };
> > @@ -211,6 +214,16 @@ static int olpc_apsp_probe(struct platform_device *pdev)
> >  	if (IS_ERR(priv->clk))
> >  		return PTR_ERR(priv->clk);
> >  
> > +	priv->clk_gpio = devm_gpiod_get_optional(&pdev->dev, "clk",
> > +							GPIOD_ASIS);
> > +	if (IS_ERR(priv->clk_gpio))
> > +		return PTR_ERR(priv->clk_gpio);
> > +
> > +	priv->data_gpio = devm_gpiod_get_optional(&pdev->dev, "data",
> > +							GPIOD_ASIS);
> > +	if (IS_ERR(priv->data_gpio))
> > +		return PTR_ERR(priv->data_gpio);
> > +
> >  	/* KEYBOARD */
> >  	kb_serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
> >  	if (!kb_serio)
> > -- 
> > 2.19.0
> > 
> 
> -- 
> Dmitry

-- 
Dmitry