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author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-02-05 11:11:27 +0100 |
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committer | Simon Horman <horms+renesas@verge.net.au> | 2015-02-24 06:36:17 +0900 |
commit | b1e5bbd61eb7584caa61ab3b89f3a66c3d5b4dd3 (patch) | |
tree | 66867e5c3e985564d99bc7849efd5054fe1ce7c7 /Documentation/devicetree/bindings/bus | |
parent | 7e7c17f10484d3bad38ea4dddc98485a8a40e4aa (diff) | |
download | linux-stable-b1e5bbd61eb7584caa61ab3b89f3a66c3d5b4dd3.tar.gz linux-stable-b1e5bbd61eb7584caa61ab3b89f3a66c3d5b4dd3.tar.bz2 linux-stable-b1e5bbd61eb7584caa61ab3b89f3a66c3d5b4dd3.zip |
drivers: bus: Add Renesas Bus State Controller (BSC) DT Bindings
The bindings for the BSC extend the bindings for "simple-pm-bus".
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'Documentation/devicetree/bindings/bus')
-rw-r--r-- | Documentation/devicetree/bindings/bus/renesas,bsc.txt | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/bus/renesas,bsc.txt b/Documentation/devicetree/bindings/bus/renesas,bsc.txt new file mode 100644 index 000000000000..90e947269437 --- /dev/null +++ b/Documentation/devicetree/bindings/bus/renesas,bsc.txt @@ -0,0 +1,46 @@ +Renesas Bus State Controller (BSC) +================================== + +The Renesas Bus State Controller (BSC, sometimes called "LBSC within Bus +Bridge", or "External Bus Interface") can be found in several Renesas ARM SoCs. +It provides an external bus for connecting multiple external devices to the +SoC, driving several chip select lines, for e.g. NOR FLASH, Ethernet and USB. + +While the BSC is a fairly simple memory-mapped bus, it may be part of a PM +domain, and may have a gateable functional clock. +Before a device connected to the BSC can be accessed, the PM domain +containing the BSC must be powered on, and the functional clock +driving the BSC must be enabled. + +The bindings for the BSC extend the bindings for "simple-pm-bus". + + +Required properties + - compatible: Must contain an SoC-specific value, and "renesas,bsc" and + "simple-pm-bus" as fallbacks. + SoC-specific values can be: + "renesas,bsc-r8a73a4" for R-Mobile APE6 (r8a73a4) + "renesas,bsc-sh73a0" for SH-Mobile AG5 (sh73a0) + - #address-cells, #size-cells, ranges: Must describe the mapping between + parent address and child address spaces. + - reg: Must contain the base address and length to access the bus controller. + +Optional properties: + - interrupts: Must contain a reference to the BSC interrupt, if available. + - clocks: Must contain a reference to the functional clock, if available. + - power-domains: Must contain a reference to the PM domain, if available. + + +Example: + + bsc: bus@fec10000 { + compatible = "renesas,bsc-sh73a0", "renesas,bsc", + "simple-pm-bus"; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0 0x20000000>; + reg = <0xfec10000 0x400>; + interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&zb_clk>; + power-domains = <&pd_a4s>; + }; |