linux-kernel - Re: [PATCH v2 8/8] Input: olpc

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Date:   Wed, 10 Oct 2018 10:10:13 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        James Cameron <quozl@...top.org>, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 8/8] Input: olpc_apsp: allocate the GPIOs used

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"?

> 
> Signed-off-by: Lubomir Rintel <lkundrak@...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