From 941461216c8d96b2c8b91233ba71483e011f78a3 Mon Sep 17 00:00:00 2001 From: Andy Yan Date: Mon, 16 Jun 2025 15:05:17 +0800 Subject: [PATCH] drivers/panel: raydium-rm67200: Make reset-gpio optional Although the datasheet of the panel module describes that it has a reset pin, in the actual hardware design, we often use an RC circuit to control the reset, and rarely use GPIO to control the reset. This is the way it is done on our numerous development boards (such as RK3568/RK3576 EVB). So make the reset-gpio optional. Signed-off-by: Andy Yan Reviewed-by: Sebastian Reichel Signed-off-by: Neil Armstrong Link: https://lore.kernel.org/r/20250616070536.670519-2-andyshrk@163.com --- drivers/gpu/drm/panel/panel-raydium-rm67200.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-raydium-rm67200.c b/drivers/gpu/drm/panel/panel-raydium-rm67200.c index 1da8225e6f7a5..654ce2739ccde 100644 --- a/drivers/gpu/drm/panel/panel-raydium-rm67200.c +++ b/drivers/gpu/drm/panel/panel-raydium-rm67200.c @@ -36,12 +36,14 @@ static inline struct raydium_rm67200 *to_raydium_rm67200(struct drm_panel *panel static void raydium_rm67200_reset(struct raydium_rm67200 *ctx) { - gpiod_set_value_cansleep(ctx->reset_gpio, 0); - msleep(60); - gpiod_set_value_cansleep(ctx->reset_gpio, 1); - msleep(60); - gpiod_set_value_cansleep(ctx->reset_gpio, 0); - msleep(60); + if (ctx->reset_gpio) { + gpiod_set_value_cansleep(ctx->reset_gpio, 0); + msleep(60); + gpiod_set_value_cansleep(ctx->reset_gpio, 1); + msleep(60); + gpiod_set_value_cansleep(ctx->reset_gpio, 0); + msleep(60); + } } static void raydium_rm67200_write(struct mipi_dsi_multi_context *ctx, @@ -409,7 +411,7 @@ static int raydium_rm67200_probe(struct mipi_dsi_device *dsi) if (ret < 0) return ret; - ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(ctx->reset_gpio)) return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio), "Failed to get reset-gpios\n"); -- 2.47.2