On Wed, Jul 10, 2019 at 04:31:09PM +0800, Phil Reid wrote:
> G'day Nishad,
>
> I'm just wondering if the commit
> c440eee1a7a1d0f "Staging: fbtft: Switch to the gpio descriptor interface"
> was tested on anything.
>
> I've had to apply the following patch to get my display functioning again.
>
> in particular the devm_gpiod_get_index using dev->driver->name for the gpio
> lookup seems
> wrong.
>
> Also I've had to invert the polarity of the reset-gpios in the DT file for
> the display to function.
>
> this code:
> gpiod_set_value_cansleep(par->gpio.reset, 0);
> usleep_range(20, 40);
> gpiod_set_value_cansleep(par->gpio.reset, 1);
>
> could be read as deasserting the reset line and then asserting it.
> So I've had to specify and active high reset line in the DT.
>
> Regards
> Phil
>
Hello Phil,
This patch was only compiled successfully.
It hasn't been tested on any hardware.
Sorry for the mistake.
Thanks and regards,
Nishad
>
>
>
> diff --git a/drivers/staging/fbtft/fbtft-core.c
> b/drivers/staging/fbtft/fbtft-core.c
> index 9b07bad..6fe7cb5 100644
> --- a/drivers/staging/fbtft/fbtft-core.c
> +++ b/drivers/staging/fbtft/fbtft-core.c
> @@ -79,18 +79,16 @@ static int fbtft_request_one_gpio(struct fbtft_par *par,
> struct device_node *node = dev->of_node;
> int ret = 0;
>
> - if (of_find_property(node, name, NULL)) {
> - *gpiop = devm_gpiod_get_index(dev, dev->driver->name, index,
> - GPIOD_OUT_HIGH);
> - if (IS_ERR(*gpiop)) {
> - ret = PTR_ERR(*gpiop);
> - dev_err(dev,
> - "Failed to request %s GPIO:%d\n", name, ret);
> - return ret;
> - }
> - fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
> - __func__, name);
> + *gpiop = devm_gpiod_get_index_optional(dev, name, index,
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(*gpiop)) {
> + ret = PTR_ERR(*gpiop);
> + dev_err(dev,
> + "Failed to request %s GPIO: (%d)\n", name, ret);
> + return ret;
> }
> + fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
> + __func__, name);
>
> return ret;
> }
> @@ -103,34 +101,34 @@ static int fbtft_request_gpios_dt(struct fbtft_par *par)
> if (!par->info->device->of_node)
> return -EINVAL;
>
> - ret = fbtft_request_one_gpio(par, "reset-gpios", 0, &par->gpio.reset);
> + ret = fbtft_request_one_gpio(par, "reset", 0, &par->gpio.reset);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "dc-gpios", 0, &par->gpio.dc);
> + ret = fbtft_request_one_gpio(par, "dc", 0, &par->gpio.dc);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "rd-gpios", 0, &par->gpio.rd);
> + ret = fbtft_request_one_gpio(par, "rd", 0, &par->gpio.rd);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "wr-gpios", 0, &par->gpio.wr);
> + ret = fbtft_request_one_gpio(par, "wr", 0, &par->gpio.wr);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "cs-gpios", 0, &par->gpio.cs);
> + ret = fbtft_request_one_gpio(par, "cs", 0, &par->gpio.cs);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "latch-gpios", 0, &par->gpio.latch);
> + ret = fbtft_request_one_gpio(par, "latch", 0, &par->gpio.latch);
> if (ret)
> return ret;
> for (i = 0; i < 16; i++) {
> - ret = fbtft_request_one_gpio(par, "db-gpios", i,
> + ret = fbtft_request_one_gpio(par, "db", i,
> &par->gpio.db[i]);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "led-gpios", i,
> + ret = fbtft_request_one_gpio(par, "led", i,
> &par->gpio.led[i]);
> if (ret)
> return ret;
> - ret = fbtft_request_one_gpio(par, "aux-gpios", i,
> + ret = fbtft_request_one_gpio(par, "aux", i,
> &par->gpio.aux[i]);
> if (ret)
> return ret;
>
>
>
>
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