[PATCH 00/12] drm/bridge: Kconfig: cleanup DRM_PANEL usage

[PATCH 00/12] drm/bridge: Kconfig: cleanup DRM_PANEL usage

[Luca Ceresoli]

As a cleanup in preparation for making every drm_panel create a
panel_bridge, remove unnecessary or wrong usage of 'depends on DRM_PANEL'
and 'select DRM_PANEL' from drivers/gpu/drm/bridge/Kconfig.

== Grand plan

This is part of the work to support hotplug of DRM bridges. The grand plan
was discussed in [0].

Here's the work breakdown (➜ marks the current series):

 1. ➜ add refcounting to DRM bridges struct drm_bridge,
      based on devm_drm_bridge_alloc()
    A. ✔ add new alloc API and refcounting (v6.16)
    B. ✔ convert all bridge drivers to new API (v6.17)
    C. ✔ kunit tests (v6.17)
    D. ✔ add get/put to drm_bridge_add/remove() + attach/detach()
         and warn on old allocation pattern (v6.17)
    E. ➜ add get/put on drm_bridge accessors
       1. ✔ drm_bridge_chain_get_first_bridge(), add cleanup action (v6.18)
       2. ✔ drm_bridge_get_prev_bridge() (v6.18)
       3. ✔ drm_bridge_get_next_bridge() (v6.19)
       4. ✔ drm_for_each_bridge_in_chain() (v6.19)
       5. ✔ drm_bridge_connector_init (v6.19)
       6. ✔ protect encoder bridge chain with a mutex (v7.2)
       7. ✔ of_drm_find_bridge
          a. ✔ add of_drm_get_bridge() (v7.0),
               convert basic direct users (v7.0-v7.1)
          b. ✔ convert direct of_drm_get_bridge() users, part 2 (v7.0)
          c. ✔ convert direct of_drm_get_bridge() users, part 3 (v7.0)
          d. ✔ convert direct of_drm_get_bridge() users, part 4 (v7.1-v7.2)
          e. ✔ bridge-only drm_of_find_panel_or_bridge() users (v7.2)
       8. ➜ panel_bridge lifetime
          a. ➜ cleanup DRM_PANEL in bridge drivers
	  b.   add a panel_bridge to every panel
       9. ✔ enforce drm_bridge_add before drm_bridge_attach (v6.19)
    F. ✔ debugfs improvements
       1. ✔ add top-level 'bridges' file (v6.16)
       2. ✔ show refcount and list lingering bridges (v6.19)
 2. ✔ handle gracefully atomic updates during bridge removal
    A. ✔ Add drm_bridge_enter/exit() to protect device resources (v7.0)
    B. ✔ Add drm_bridge_clear_and_put() (v7.1)
 3. … DSI host-device driver interaction
 4. ✔ removing the need for the "always-disconnected" connector
 5. ✔ Migrate i.MX LCDIF driver to bridge-connector (v7.2)
 6. … DRM bridge hotplug
    A. … Bridge hotplug management in the DRM core
       1. ✔ bridge-connector: attach encoder to the connector (v7.2)
       2. … drm bridge hotplug
    B.   Device tree description

[0] https://lore.kernel.org/lkml/20250206-hotplug-drm-bridge-v6-0-9d6f2c9c3058@bootlin.com/#t

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
Luca Ceresoli (12):
      drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: don't select unused DRM_PANEL
      drm/bridge: tc358764: don't select unused DRM_PANEL
      drm/bridge: ti-dlpc3433: don't depend on DRM_PANEL
      drm/bridge: ti-sn65dsi86: don't select unused DRM_PANEL
      drm/bridge: ti-sn65dsi83: select DRM_PANEL_BRIDGE
      drm/bridge: nxp-ptn3460: select DRM_PANEL_BRIDGE
      drm/bridge: parade-ps8622: select DRM_PANEL_BRIDGE
      drm/bridge: parade-ps8640: select DRM_PANEL_BRIDGE
      drm/bridge: tc358775: select DRM_PANEL_BRIDGE
      drm/bridge: tc358767: select DRM_PANEL_BRIDGE
      drm/bridge: tc358768: select DRM_PANEL_BRIDGE
      drm/bridge: ssd2825: select DRM_PANEL_BRIDGE

 drivers/gpu/drm/bridge/Kconfig | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)
---
base-commit: d3850569e847e8912b9be6e0fe6b91fb75293647
change-id: 20260812-drm-bridge-drm_panel-cleanup-09ed5cc10948

Best regards,
--  
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

[PATCH 01/12] drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: don't select unused DRM_PANEL

[Luca Ceresoli]

This driver does not use the drm_panel APIs at all, so no need to select
DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 4a57d49b4c6d..a999e57d0cc1 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -225,7 +225,6 @@ config DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW
 	tristate "MegaChips stdp4028-ge-b850v3-fw and stdp2690-ge-b850v3-fw"
 	depends on OF
 	select DRM_KMS_HELPER
-	select DRM_PANEL
 	help
 	  This is a driver for the display bridges of
 	  GE B850v3 that convert dual channel LVDS

-- 
2.55.0

[PATCH 02/12] drm/bridge: tc358764: don't select unused DRM_PANEL

[Luca Ceresoli]

This driver does not use the drm_panel APIs at all, so no need to select
DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index a999e57d0cc1..958b4f687d4d 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -388,7 +388,6 @@ config DRM_TOSHIBA_TC358764
 	depends on OF
 	select DRM_MIPI_DSI
 	select DRM_KMS_HELPER
-	select DRM_PANEL
 	help
 	  Toshiba TC358764 DSI/LVDS bridge driver.
 

-- 
2.55.0

[PATCH 03/12] drm/bridge: ti-dlpc3433: don't depend on DRM_PANEL

[Luca Ceresoli]

This driver does not use the drm_panel APIs at all, so no need to select
DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 958b4f687d4d..043596801a65 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -428,7 +428,7 @@ config DRM_TOSHIBA_TC358775
 
 config DRM_TI_DLPC3433
 	tristate "TI DLPC3433 Display controller"
-	depends on DRM && DRM_PANEL
+	depends on DRM
 	depends on OF
 	select DRM_MIPI_DSI
 	help

-- 
2.55.0

[PATCH 04/12] drm/bridge: ti-sn65dsi86: don't select unused DRM_PANEL

[Luca Ceresoli]

This driver does not use the drm_panel APIs at all, so no need to select
DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 043596801a65..d46aa2eb01b5 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -474,7 +474,6 @@ config DRM_TI_SN65DSI86
 	select DRM_BRIDGE_CONNECTOR
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
-	select DRM_PANEL
 	select DRM_MIPI_DSI
 	select AUXILIARY_BUS
 	select DRM_DISPLAY_DP_AUX_BUS

-- 
2.55.0

[PATCH 05/12] drm/bridge: ti-sn65dsi83: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses the drm_panel_bridge API and not the drm_panel API so it
should select DRM_PANEL_BRIDGE and not DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index d46aa2eb01b5..03f52dcbba6f 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -461,7 +461,7 @@ config DRM_TI_SN65DSI83
 	depends on OF
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	select DRM_MIPI_DSI
 	help
 	  Texas Instruments SN65DSI83 and SN65DSI84 DSI to LVDS Bridge driver

-- 
2.55.0

[PATCH 06/12] drm/bridge: nxp-ptn3460: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses the drm_panel_bridge API and not the drm_panel API so it
should select DRM_PANEL_BRIDGE and not DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 03f52dcbba6f..e59b6689ced3 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -259,7 +259,7 @@ config DRM_NXP_PTN3460
 	tristate "NXP PTN3460 DP/LVDS bridge"
 	depends on OF
 	select DRM_KMS_HELPER
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	help
 	  NXP PTN3460 eDP-LVDS bridge chip driver.
 

-- 
2.55.0

[PATCH 07/12] drm/bridge: parade-ps8622: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses the drm_panel_bridge API and not the drm_panel API so it
should select DRM_PANEL_BRIDGE and not DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index e59b6689ced3..8bb5612a0ff5 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -276,7 +276,7 @@ config DRM_OF_DISPLAY_MODE_BRIDGE
 config DRM_PARADE_PS8622
 	tristate "Parade eDP/LVDS bridge"
 	depends on OF
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	select DRM_KMS_HELPER
 	select BACKLIGHT_CLASS_DEVICE
 	help

-- 
2.55.0

[PATCH 08/12] drm/bridge: parade-ps8640: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses the drm_panel_bridge API and not the drm_panel API so it
should select DRM_PANEL_BRIDGE and not DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 8bb5612a0ff5..0f9ca869237b 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -290,7 +290,7 @@ config DRM_PARADE_PS8640
 	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	help
 	  Choose this option if you have PS8640 for display
 	  The PS8640 is a high-performance and low-power

-- 
2.55.0

[PATCH 09/12] drm/bridge: tc358775: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses the drm_panel_bridge API and not the drm_panel API so it
should select DRM_PANEL_BRIDGE and not DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 0f9ca869237b..7874d3b1e760 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -421,7 +421,7 @@ config DRM_TOSHIBA_TC358775
 	select DRM_DISPLAY_HELPER
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	select DRM_MIPI_DSI
 	help
 	  Toshiba TC358775 DSI/LVDS bridge chip driver.

-- 
2.55.0

[PATCH 10/12] drm/bridge: tc358767: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses a mixture of drm_panel and drm_panel_bridge APIs, but the
Kconfig symbol only selects DRM_PANEL.

Select DRM_PANEL_BRIDGE instead, which in turn depends on DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 7874d3b1e760..8eaaa3282062 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -399,7 +399,7 @@ config DRM_TOSHIBA_TC358767
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
 	select DRM_MIPI_DSI
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	help
 	  Toshiba TC358767 eDP bridge chip driver.
 

-- 
2.55.0

[PATCH 11/12] drm/bridge: tc358768: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses a mixture of drm_panel and drm_panel_bridge APIs, but the
Kconfig symbol only selects DRM_PANEL.

Select DRM_PANEL_BRIDGE instead, which in turn depends on DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 8eaaa3282062..afcc5cce88cb 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -408,7 +408,7 @@ config DRM_TOSHIBA_TC358768
 	depends on OF
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	select DRM_MIPI_DSI
 	select VIDEOMODE_HELPERS
 	help

-- 
2.55.0

[PATCH 12/12] drm/bridge: ssd2825: select DRM_PANEL_BRIDGE

[Luca Ceresoli]

This driver uses a mixture of drm_panel and drm_panel_bridge APIs, but the
Kconfig symbol only selects DRM_PANEL.

Select DRM_PANEL_BRIDGE instead, which in turn depends on DRM_PANEL.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index afcc5cce88cb..02c41ec2587f 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -350,7 +350,7 @@ config DRM_SOLOMON_SSD2825
 	depends on SPI_MASTER && OF
 	select DRM_MIPI_DSI
 	select DRM_KMS_HELPER
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	help
 	  Say Y here if you want support for the Solomon SSD2825 RGB/DSI
 	  SPI bridge driver.

-- 
2.55.0

Re: [PATCH 01/12] drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: don't select unused DRM_PANEL

[Ian Ray]

On Wed, Aug 12, 2026 at 03:42:41PM +0200, Luca Ceresoli wrote:
> This driver does not use the drm_panel APIs at all, so no need to select
> DRM_PANEL.
> 
> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

Reviewed-by: Ian Ray <ian.ray@gehealthcare.com>

> ---
>  drivers/gpu/drm/bridge/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 4a57d49b4c6d..a999e57d0cc1 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -225,7 +225,6 @@ config DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW
>         tristate "MegaChips stdp4028-ge-b850v3-fw and stdp2690-ge-b850v3-fw"
>         depends on OF
>         select DRM_KMS_HELPER
> -       select DRM_PANEL
>         help
>           This is a driver for the display bridges of
>           GE B850v3 that convert dual channel LVDS
> 
> --
> 2.55.0
>