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SubjectRe: [PATCH v2 2/4] video: ssd1307fb: Do not hard code active-low reset sequence
On 20/12/2018 12:13:55+0000, Vokáč Michal wrote:
> The SSD130x OLED display reset signal is active low. Now the reset
> sequence is implemented in such a way that users are forced to
> define reset-gpios as GPIO_ACTIVE_HIGH in DT to make the reset work.
>
> Do not hard code the active-low sequence into the driver but instead
> allow the user to specify the gpio as GPIO_ACTIVE_LOW to reflect
> the real world.
>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
> Changes from v1:
> - Add R-by from Rob
>
> drivers/video/fbdev/ssd1307fb.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
> index 4061a20..3b361bc 100644
> --- a/drivers/video/fbdev/ssd1307fb.c
> +++ b/drivers/video/fbdev/ssd1307fb.c
> @@ -667,10 +667,10 @@ static int ssd1307fb_probe(struct i2c_client *client,
>
> if (par->reset) {
> /* Reset the screen */
> - gpiod_set_value_cansleep(par->reset, 0);
> - udelay(4);
> gpiod_set_value_cansleep(par->reset, 1);
> udelay(4);
> + gpiod_set_value_cansleep(par->reset, 0);
> + udelay(4);
> }
>
> if (par->vbat_reg) {
> --
> 2.1.4
>

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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