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 <[email protected]> --- Cc: Andrzej Hajda <[email protected]> Cc: Conor Dooley <[email protected]> Cc: Daniel Vetter <[email protected]> Cc: David Airlie <[email protected]> Cc: Jernej Skrabec <[email protected]> Cc: Jonas Karlman <[email protected]> Cc: Krzysztof Kozlowski <[email protected]> Cc: Laurent Pinchart <[email protected]> Cc: Marek Vasut <[email protected]> Cc: Neil Armstrong <[email protected]> Cc: Rob Herring <[email protected]> Cc: Robert Foss <[email protected]> Cc: [email protected] Cc: [email protected] --- drivers/gpu/drm/bridge/tc358762.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/bridge/tc358762.c b/drivers/gpu/drm/bridge/tc358762.c index 77f7f7f547570..5641395fd310e 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; } -- 2.39.2
