From: Ulrich Hecht <ulrich.hecht@gmail.com>
To: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: Linux I2C <linux-i2c@vger.kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
kernel@pengutronix.de, Wolfram Sang <wsa@the-dreams.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH/RFT 6/6] i2c: recovery: remove bogus check if SDA GPIO is set to output
Date: Mon, 16 Jul 2018 11:29:29 +0200 [thread overview]
Message-ID: <CAO3366ySBBKpz1fpZ8orLTVF-tU+Gw3A7CiqaJWtmyGiU6kdYA@mail.gmail.com> (raw)
In-Reply-To: <20180713210920.3648-7-wsa+renesas@sang-engineering.com>
On Fri, Jul 13, 2018 at 11:09 PM, Wolfram Sang
<wsa+renesas@sang-engineering.com> wrote:
> This check did not work as intended. I2C is open drain, so this function
> will likely always have presented the GPIO as input because
> gpiod_get_direction doesn't know about open drain states. Remove this
> check for now. We can add it again once we know how to get more precise
> information about the GPIO.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
> drivers/i2c/i2c-core-base.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 301285c54603..7c5f012f561c 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -261,9 +261,7 @@ static void i2c_init_recovery(struct i2c_adapter *adap)
> bri->set_scl = set_scl_gpio_value;
> if (bri->sda_gpiod) {
> bri->get_sda = get_sda_gpio_value;
> - /* FIXME: add proper flag instead of '0' once available */
> - if (gpiod_get_direction(bri->sda_gpiod) == 0)
> - bri->set_sda = set_sda_gpio_value;
> + bri->set_sda = set_sda_gpio_value;
> }
> return;
> }
> --
> 2.11.0
>
Reviewed-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
CU
Uli
prev parent reply other threads:[~2018-07-16 9:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-13 21:09 [PATCH/RFT 0/6] i2c: recovery: fix GPIO usage for recovery Wolfram Sang
2018-07-13 21:09 ` [PATCH/RFT 1/6] i2c: designware: use open drain for recovery GPIO Wolfram Sang
2018-07-16 0:47 ` Phil Reid
2018-07-17 9:09 ` Wolfram Sang
2018-07-17 9:27 ` Phil Reid
2018-07-24 7:26 ` Wolfram Sang
2018-07-25 3:26 ` Phil Reid
2018-07-13 21:09 ` [PATCH/RFT 2/6] i2c: imx: " Wolfram Sang
2018-07-23 12:47 ` Lucas Stach
2018-07-24 7:28 ` Wolfram Sang
2018-07-24 13:01 ` Wolfram Sang
2018-07-13 21:09 ` [PATCH/RFT 3/6] i2c: designware: set SDA as output for recovery Wolfram Sang
2018-07-13 21:09 ` [PATCH/RFT 4/6] i2c: davinci: " Wolfram Sang
2018-07-13 21:09 ` [PATCH/RFT 5/6] i2c: imx: " Wolfram Sang
2018-07-13 21:09 ` [PATCH/RFT 6/6] i2c: recovery: remove bogus check if SDA GPIO is set to output Wolfram Sang
2018-07-16 9:29 ` Ulrich Hecht [this message]
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