linux-kernel - Re: [PATCH 1/2] i2c-mux-gpio: test if the gpio can sleep

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Date:	Thu, 10 Oct 2013 10:46:05 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Ionut Nicu <ioan.nicu.ext@....com>
Cc:	Peter Korsgaard <peter.korsgaard@...co.com>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: Re: [PATCH 1/2] i2c-mux-gpio: test if the gpio can sleep

On Thu, Oct 10, 2013 at 10:39:32AM +0200, Ionut Nicu wrote:
> Some gpio chips may have get/set operations that
> can sleep. For this type of chips we must use the
> _cansleep() version of gpio_set_value.
> 
> Signed-off-by: Ionut Nicu <ioan.nicu.ext@....com>
> ---
>  drivers/i2c/muxes/i2c-mux-gpio.c |   11 ++++++++---
>  1 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
> index a764da7..b5f17ef 100644
> --- a/drivers/i2c/muxes/i2c-mux-gpio.c
> +++ b/drivers/i2c/muxes/i2c-mux-gpio.c
> @@ -27,11 +27,16 @@ struct gpiomux {
>  
>  static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
>  {
> +	unsigned gpio;
>  	int i;
>  
> -	for (i = 0; i < mux->data.n_gpios; i++)
> -		gpio_set_value(mux->gpio_base + mux->data.gpios[i],
> -			       val & (1 << i));
> +	for (i = 0; i < mux->data.n_gpios; i++) {
> +		gpio = mux->gpio_base + mux->data.gpios[i];
> +		if (gpio_cansleep(gpio))
> +			gpio_set_value_cansleep(gpio, val & (1 << i));
> +		else
> +			gpio_set_value(gpio, val & (1 << i));
> +	}

There should be a wrapper for that in the gpio-subsystem IMO.
Adding linux-gpio to cc.


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