linux-kernel - [PATCH 1/5] drm/mipi-dsi: Add dev_is_mipi

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Message-Id: <20250625-drm-panel-simple-fixes-v1-1-c428494a86b8@kernel.org>
Date: Wed, 25 Jun 2025 08:48:38 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Anusha Srivatsa <asrivats@...hat.com>, 
 Francesco Dolcini <francesco@...cini.it>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 1/5] drm/mipi-dsi: Add dev_is_mipi_dsi function

This will be especially useful for generic panels (like panel-simple)
which can take different code path depending on if they are MIPI-DSI
devices or platform devices.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 3 ++-
 include/drm/drm_mipi_dsi.h     | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index e5184a0c24651756ee0b1eb27d94083d63eb35a7..21fd647f8ce1a6a862e2f8fb5320e701f26f614f 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -89,16 +89,17 @@ static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
 	.thaw = pm_generic_thaw,
 	.poweroff = pm_generic_poweroff,
 	.restore = pm_generic_restore,
 };
 
-static const struct bus_type mipi_dsi_bus_type = {
+const struct bus_type mipi_dsi_bus_type = {
 	.name = "mipi-dsi",
 	.match = mipi_dsi_device_match,
 	.uevent = mipi_dsi_uevent,
 	.pm = &mipi_dsi_device_pm_ops,
 };
+EXPORT_SYMBOL_GPL(mipi_dsi_bus_type);
 
 /**
  * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
  *    device tree node
  * @np: device tree node
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index b37860f4a895c25ef8ba1c5b3f44827ef53aa100..6d2c08e8110151a97620389197f1ef79c058329d 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -221,10 +221,13 @@ struct mipi_dsi_multi_context {
 
 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
 
 #define to_mipi_dsi_device(__dev)	container_of_const(__dev, struct mipi_dsi_device, dev)
 
+extern const struct bus_type mipi_dsi_bus_type;
+#define dev_is_mipi_dsi(dev)	((dev)->bus == &mipi_dsi_bus_type)
+
 /**
  * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
  *                                given pixel format defined by the MIPI DSI
  *                                specification
  * @fmt: MIPI DSI pixel format

-- 
2.49.0