From: Lucas Stach <l.stach@pengutronix.de>
To: Wolfram Sang <wsa+renesas@sang-engineering.com>,
linux-i2c@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel@pengutronix.de
Subject: Re: [PATCH/RFT 2/6] i2c: imx: use open drain for recovery GPIO
Date: Mon, 23 Jul 2018 14:47:28 +0200 [thread overview]
Message-ID: <1532350048.3163.101.camel@pengutronix.de> (raw)
In-Reply-To: <20180713210920.3648-3-wsa+renesas@sang-engineering.com>
Am Freitag, den 13.07.2018, 23:09 +0200 schrieb Wolfram Sang:
> I2C is open drain, so set up the GPIO accordingly.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
I don't think this matters on any of the i.MX platforms, as the GPIO
pin configuration (including open-drain) is only taken from the DT
pinctrl, with the GPIO driver not being able to change any of those. On
the flipside this results in a near zero probability of regressions.
;)
As this is obviously right even if it doesn't have any effect on
current software:
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> ---
> drivers/i2c/busses/i2c-imx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 0207e194f84b..3e23ee26c55c 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -1010,7 +1010,7 @@ static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx,
> > i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl,
> > "gpio");
> > rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN);
> > - rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", GPIOD_OUT_HIGH);
> > + rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", GPIOD_OUT_HIGH_OPEN_DRAIN);
>
> > if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER ||
> > PTR_ERR(rinfo->scl_gpiod) == -EPROBE_DEFER) {
next prev parent reply other threads:[~2018-07-23 12:47 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 [this message]
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
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