diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-11 12:46:32 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-11 12:46:32 -0800 |
commit | 413fd0e3fbf52873f2310eb75bfa6c7b72847277 (patch) | |
tree | bb83812cf8dbeaf47a39a09f023deae3b65526ab /Documentation/devicetree/bindings/video | |
parent | 6b9e2cea428cf7af93a84bcb865e478d8bf1c165 (diff) | |
parent | 3315764efceaccfb02c7d4c99ef8eed6716cd861 (diff) |
Merge tag 'fbdev-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux
Pull fbdev updates from Tomi Valkeinen:
- support for mx6sl and mx6sx
- OMAP HDMI audio rewrite to make it finally work
- OMAP video PLL work to prepare for new DRA7xx SoCs
- simplefb DT related improvements
* tag 'fbdev-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux: (81 commits)
video: uvesafb: Deletion of an unnecessary check before the function call "platform_device_put"
video: fbdev-VIA: Deletion of an unnecessary check before the function call "framebuffer_release"
video: fbdev-MMP: Deletion of an unnecessary check before the function call "mmp_unregister_path"
video: mx3fb: Deletion of an unnecessary check before the function call "backlight_device_unregister"
video: fbdev-OMAP2: Deletion of unnecessary checks before the function call "i2c_put_adapter"
video: fbdev-SIS: Deletion of unnecessary checks before the function call "pci_dev_put"
video: smscufx: Deletion of unnecessary checks before the function call "vfree"
video: udlfb: Deletion of unnecessary checks before the function call "vfree"
video: uvesafb: Deletion of an unnecessary check before the function call "uvesafb_free"
video: fbdev-LCDC: Deletion of an unnecessary check before the function call "vfree"
video: fbdev: arkfb: suppress build warning
video: fbdev: s3fb: suppress build warning
video: fbdev: vt8623fb: suppress build warning
OMAPDSS: hdmi5: Fix bit field for IEC958_AES2_CON_SOURCE
OMAPDSS: hdmi: Remove __exit qualifier from hdmi_uninit_output()
OMAPDSS: hdmi5: Change hdmi_wp idlemode to to no_idle for audio playback
OMAPDSS: Remove all references to obsolete HDMI audio callbacks
ASoC: omap: Remove obsolete HDMI audio code and Kconfig options
OMAPDSS: hdmi5: Register ASoC platform device for omap hdmi audio
OMAPDSS: hdmi5: Remove callbacks for the old ASoC DAI driver
...
Diffstat (limited to 'Documentation/devicetree/bindings/video')
-rw-r--r-- | Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt | 33 | ||||
-rw-r--r-- | Documentation/devicetree/bindings/video/simple-framebuffer.txt | 68 |
2 files changed, 97 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt b/Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt new file mode 100644 index 00000000000..c46ba641a1d --- /dev/null +++ b/Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt @@ -0,0 +1,33 @@ +Sunxi specific Simple Framebuffer bindings + +This binding documents sunxi specific extensions to the simple-framebuffer +bindings. The sunxi simplefb u-boot code relies on the devicetree containing +pre-populated simplefb nodes. + +These extensions are intended so that u-boot can select the right node based +on which pipeline is being used. As such they are solely intended for +firmware / bootloader use, and the OS should ignore them. + +Required properties: +- compatible: "allwinner,simple-framebuffer" +- allwinner,pipeline, one of: + "de_be0-lcd0" + "de_be1-lcd1" + "de_be0-lcd0-hdmi" + "de_be1-lcd1-hdmi" + +Example: + +chosen { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + framebuffer@0 { + compatible = "allwinner,simple-framebuffer", "simple-framebuffer"; + allwinner,pipeline = "de_be0-lcd0-hdmi"; + clocks = <&pll5 1>, <&ahb_gates 36>, <&ahb_gates 43>, + <&ahb_gates 44>; + status = "disabled"; + }; +}; diff --git a/Documentation/devicetree/bindings/video/simple-framebuffer.txt b/Documentation/devicetree/bindings/video/simple-framebuffer.txt index 70c26f3a5b9..4474ef6e0b9 100644 --- a/Documentation/devicetree/bindings/video/simple-framebuffer.txt +++ b/Documentation/devicetree/bindings/video/simple-framebuffer.txt @@ -1,8 +1,40 @@ Simple Framebuffer -A simple frame-buffer describes a raw memory region that may be rendered to, -with the assumption that the display hardware has already been set up to scan -out from that buffer. +A simple frame-buffer describes a frame-buffer setup by firmware or +the bootloader, with the assumption that the display hardware has already +been set up to scan out from the memory pointed to by the reg property. + +Since simplefb nodes represent runtime information they must be sub-nodes of +the chosen node (*). Simplefb nodes must be named "framebuffer@<address>". + +If the devicetree contains nodes for the display hardware used by a simplefb, +then the simplefb node must contain a property called "display", which +contains a phandle pointing to the primary display hw node, so that the OS +knows which simplefb to disable when handing over control to a driver for the +real hardware. The bindings for the hw nodes must specify which node is +considered the primary node. + +It is advised to add display# aliases to help the OS determine how to number +things. If display# aliases are used, then if the simplefb node contains a +"display" property then the /aliases/display# path must point to the display +hw node the "display" property points to, otherwise it must point directly +to the simplefb node. + +If a simplefb node represents the preferred console for user interaction, +then the chosen node's stdout-path property should point to it, or to the +primary display hw node, as with display# aliases. If display aliases are +used then it should be set to the alias instead. + +It is advised that devicetree files contain pre-filled, disabled framebuffer +nodes, so that the firmware only needs to update the mode information and +enable them. This way if e.g. later on support for more display clocks get +added, the simplefb nodes will already contain this info and the firmware +does not need to be updated. + +If pre-filled framebuffer nodes are used, the firmware may need extra +information to find the right node. In that case an extra platform specific +compatible and platform specific properties should be used and documented, +see e.g. simple-framebuffer-sunxi.txt . Required properties: - compatible: "simple-framebuffer" @@ -14,13 +46,41 @@ Required properties: - r5g6b5 (16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b). - a8b8g8r8 (32-bit pixels, d[31:24]=a, d[23:16]=b, d[15:8]=g, d[7:0]=r). +Optional properties: +- clocks : List of clocks used by the framebuffer. Clocks listed here + are expected to already be configured correctly. The OS must + ensure these clocks are not modified or disabled while the + simple framebuffer remains active. +- display : phandle pointing to the primary display hardware node + Example: - framebuffer { +aliases { + display0 = &lcdc0; +} + +chosen { + framebuffer0: framebuffer@1d385000 { compatible = "simple-framebuffer"; reg = <0x1d385000 (1600 * 1200 * 2)>; width = <1600>; height = <1200>; stride = <(1600 * 2)>; format = "r5g6b5"; + clocks = <&ahb_gates 36>, <&ahb_gates 43>, <&ahb_gates 44>; + display = <&lcdc0>; + }; + stdout-path = "display0"; +}; + +soc@01c00000 { + lcdc0: lcdc@1c0c000 { + compatible = "allwinner,sun4i-a10-lcdc"; + ... }; +}; + + +*) Older devicetree files may have a compatible = "simple-framebuffer" node +in a different place, operating systems must first enumerate any compatible +nodes found under chosen and then check for other compatible nodes. |