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drm/tilcdc: panel: make better use of gpiod API 

Since 39b2bbe3d7 (gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for output.

Furthermore there is devm_gpiod_get_optional which is designed to get
optional gpios.

Simplify driver accordingly.

Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This commit is contained in:
Uwe Kleine-König 2015-02-11 17:32:53 +01:00
parent 89ae3d3b9a
commit 26a5bd2649
1 changed files with 7 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/gpu/drm/tilcdc/tilcdc_panel.c
View File

@ -375,25 +375,17 @@ static int panel_probe(struct platform_device *pdev)
dev_info(&pdev->dev, "found backlight\n");
}
panel_mod->enable_gpio = devm_gpiod_get(&pdev->dev, "enable");
panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
GPIOD_OUT_LOW);
if (IS_ERR(panel_mod->enable_gpio)) {
ret = PTR_ERR(panel_mod->enable_gpio);
if (ret != -ENOENT) {
dev_err(&pdev->dev, "failed to request enable GPIO\n");
goto fail_backlight;
}
/* Optional GPIO is not here, continue silently. */
panel_mod->enable_gpio = NULL;
} else {
ret = gpiod_direction_output(panel_mod->enable_gpio, 0);
if (ret < 0) {
dev_err(&pdev->dev, "failed to setup GPIO\n");
goto fail_backlight;
}
dev_info(&pdev->dev, "found enable GPIO\n");
dev_err(&pdev->dev, "failed to request enable GPIO\n");
goto fail_backlight;
}
if (panel_mod->enable_gpio)
dev_info(&pdev->dev, "found enable GPIO\n");
mod = &panel_mod->base;
pdev->dev.platform_data = mod;