diff options
| author | Marek Vasut <marex@denx.de> | 2023-05-30 21:28:05 +0200 |
|---|---|---|
| committer | Robert Foss <rfoss@kernel.org> | 2023-06-01 14:49:04 +0200 |
| commit | 3355f4ee561da6065cc756bf54a3f8bb556889df (patch) | |
| tree | 8b91fea75ddd4d3197edb77b6bbddbbff66526bd /drivers/gpu/drm/bridge | |
| parent | e8001973bb4567e8dece6fdcbe4c72313df9945e (diff) | |
| download | linux-stable-3355f4ee561da6065cc756bf54a3f8bb556889df.tar.gz linux-stable-3355f4ee561da6065cc756bf54a3f8bb556889df.tar.bz2 linux-stable-3355f4ee561da6065cc756bf54a3f8bb556889df.zip | |
drm/bridge: tc358762: Add reset GPIO support
Add reset GPIO support. The reset GPIO is cleared after supply regulator
was enabled, and set before supply regulator is disabled.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230530192805.648646-2-marex@denx.de
Diffstat (limited to 'drivers/gpu/drm/bridge')
| -rw-r--r-- | drivers/gpu/drm/bridge/tc358762.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/tc358762.c b/drivers/gpu/drm/bridge/tc358762.c index 77f7f7f54757..5641395fd310 100644 --- a/drivers/gpu/drm/bridge/tc358762.c +++ b/drivers/gpu/drm/bridge/tc358762.c @@ -11,6 +11,7 @@ */ #include <linux/delay.h> +#include <linux/gpio/consumer.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/of_graph.h> @@ -63,6 +64,7 @@ struct tc358762 { struct drm_bridge bridge; struct regulator *regulator; struct drm_bridge *panel_bridge; + struct gpio_desc *reset_gpio; bool pre_enabled; int error; }; @@ -138,6 +140,9 @@ static void tc358762_post_disable(struct drm_bridge *bridge) ctx->pre_enabled = false; + if (ctx->reset_gpio) + gpiod_set_value_cansleep(ctx->reset_gpio, 0); + ret = regulator_disable(ctx->regulator); if (ret < 0) dev_err(ctx->dev, "error disabling regulators (%d)\n", ret); @@ -152,6 +157,11 @@ static void tc358762_pre_enable(struct drm_bridge *bridge) if (ret < 0) dev_err(ctx->dev, "error enabling regulators (%d)\n", ret); + if (ctx->reset_gpio) { + gpiod_set_value_cansleep(ctx->reset_gpio, 1); + usleep_range(5000, 10000); + } + ret = tc358762_init(ctx); if (ret < 0) dev_err(ctx->dev, "error initializing bridge (%d)\n", ret); @@ -185,6 +195,11 @@ static int tc358762_parse_dt(struct tc358762 *ctx) ctx->panel_bridge = panel_bridge; + /* Reset GPIO is optional */ + ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(ctx->reset_gpio)) + return PTR_ERR(ctx->reset_gpio); + return 0; } |