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Commit 16ea975e authored by Rob Clark's avatar Rob Clark
Browse files

drm/tilcdc: add TI LCD Controller DRM driver (v4) 



A simple DRM/KMS driver for the TI LCD Controller found in various
smaller TI parts (AM33xx, OMAPL138, etc).  This driver uses the
CMA helpers.  Currently only the TFP410 DVI encoder is supported
(tested with beaglebone + DVI cape).  There are also various LCD
displays, for which support can be added (as I get hw to test on),
and an external i2c HDMI encoder found on some boards.

The display controller supports a single CRTC.  And the encoder+
connector are split out into sub-devices.  Depending on which LCD
or external encoder is actually present, the appropriate output
module(s) will be loaded.

v1: original
v2: fix fb refcnting and few other cleanups
v3: get +/- vsync/hsync from timings rather than panel-info, add
    option DT max-bandwidth field so driver doesn't attempt to
    pick a display mode with too high memory bandwidth, and other
    small cleanups
v4: remove some unneeded stuff from panel-info struct, properly
    set high bits for hfp/hsw/hbp for rev 2, add DT bindings docs

Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: default avatarKoen Kooi <koen@dominion.thruhere.net>
parent b3d3de80

Documentation/devicetree/bindings/drm/tilcdc/tfp410.txt

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Device-Tree bindings for tilcdc DRM TFP410 output driver



Required properties:

 - compatible: value should be "ti,tilcdc,tfp410".

 - i2c: the phandle for the i2c device to use for DDC



Recommended properties:

 - pinctrl-names, pinctrl-0: the pincontrol settings to configure

   muxing properly for pins that connect to TFP410 device

 - powerdn-gpio: the powerdown GPIO, pulled low to power down the

   TFP410 device (for DPMS_OFF)



Example:



	dvicape {

		compatible = "ti,tilcdc,tfp410";

		i2c = <&i2c2>;

		pinctrl-names = "default";

		pinctrl-0 = <&bone_dvi_cape_dvi_00A1_pins>;

		powerdn-gpio = <&gpio2 31 0>;

	};

Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt

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Device-Tree bindings for tilcdc DRM driver



Required properties:

 - compatible: value should be "ti,am33xx-tilcdc".

 - interrupts: the interrupt number

 - reg: base address and size of the LCDC device



Recommended properties:

 - interrupt-parent: the phandle for the interrupt controller that

   services interrupts for this device.

 - ti,hwmods: Name of the hwmod associated to the LCDC



Example:



	fb: fb@4830e000 {

		compatible = "ti,am33xx-tilcdc";

		reg = <0x4830e000 0x1000>;

		interrupt-parent = <&intc>;

		interrupts = <36>;

		ti,hwmods = "lcdc";

	};

drivers/gpu/drm/Kconfig

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@@ -215,3 +215,5 @@ source "drivers/gpu/drm/cirrus/Kconfig" 
source "drivers/gpu/drm/shmobile/Kconfig"



source "drivers/gpu/drm/tegra/Kconfig"



source "drivers/gpu/drm/tilcdc/Kconfig"

drivers/gpu/drm/Makefile

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@@ -50,4 +50,5 @@ obj-$(CONFIG_DRM_UDL) += udl/ 
obj-$(CONFIG_DRM_AST) += ast/

obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/

obj-$(CONFIG_DRM_TEGRA) += tegra/

obj-$(CONFIG_DRM_TILCDC)	+= tilcdc/

obj-y			+= i2c/

drivers/gpu/drm/tilcdc/Kconfig

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config DRM_TILCDC

	tristate "DRM Support for TI LCDC Display Controller"

	depends on DRM && OF

	select DRM_KMS_HELPER

	select DRM_KMS_CMA_HELPER

	select DRM_GEM_CMA_HELPER

	help

	  Choose this option if you have an TI SoC with LCDC display

	  controller, for example AM33xx in beagle-bone, DA8xx, or

	  OMAP-L1xx.  This driver replaces the FB_DA8XX fbdev driver.