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drm/bridge: tc358762: Add reset GPIO support

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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
This commit is contained in:
Marek Vasut 2023-05-30 21:28:05 +02:00 committed by Robert Foss
parent e8001973bb
commit 3355f4ee56
No known key found for this signature in database
GPG Key ID: 3EFD900F76D1D784
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/bridge/tc358762.c
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@ -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;
}