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SubjectRe: [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@v3.sk>
> > ---
> > 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

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