linux-kernel - Re: [PATCH 12/12] i2c: gpio: flag atomic capability if possible

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Date:   Mon, 15 Apr 2019 15:38:41 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-i2c <linux-i2c@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Peter Rosin <peda@...ntia.se>,
        Stefan Lengfeld <contact@...fanchrist.eu>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 12/12] i2c: gpio: flag atomic capability if possible

On Wed, Apr 3, 2019 at 3:42 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
> If switching GPIOs does not sleep, then we can support atomic transfers.
>

Reviewed-by Andy Shevchenko <andriy.shevchenko@...ux.intel.com>


> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
>  drivers/i2c/busses/i2c-gpio.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
> index bba5c4627de3..9684a0ac2a6d 100644
> --- a/drivers/i2c/busses/i2c-gpio.c
> +++ b/drivers/i2c/busses/i2c-gpio.c
> @@ -413,6 +413,8 @@ static int i2c_gpio_probe(struct platform_device *pdev)
>
>         if (gpiod_cansleep(priv->sda) || gpiod_cansleep(priv->scl))
>                 dev_warn(dev, "Slow GPIO pins might wreak havoc into I2C/SMBus bus timing");
> +       else
> +               bit_data->can_do_atomic = true;
>
>         bit_data->setsda = i2c_gpio_setsda_val;
>         bit_data->setscl = i2c_gpio_setscl_val;
> --
> 2.11.0
>


-- 
With Best Regards,
Andy Shevchenko