CLK: TI: add interface clock support for OMAP3

OMAP3 has interface clocks in addition to functional clocks, which
require special handling for the autoidle and idle status register
offsets mainly.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/ti/interface.txt b/Documentation/devicetree/bindings/clock/ti/interface.txt
new file mode 100644
index 000000000000..064e8caccac3
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti/interface.txt
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+Binding for Texas Instruments interface clock.
+
+Binding status: Unstable - ABI compatibility may be broken in the future
+
+This binding uses the common clock binding[1]. This clock is
+quite much similar to the basic gate-clock [2], however,
+it supports a number of additional features, including
+companion clock finding (match corresponding functional gate
+clock) and hardware autoidle enable / disable.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/clock/gate-clock.txt
+
+Required properties:
+- compatible : shall be one of:
+  "ti,omap3-interface-clock" - basic OMAP3 interface clock
+  "ti,omap3-no-wait-interface-clock" - interface clock which has no hardware
+                                       capability for waiting clock to be ready
+  "ti,omap3-hsotgusb-interface-clock" - interface clock with USB specific HW
+                                        handling
+  "ti,omap3-dss-interface-clock" - interface clock with DSS specific HW handling
+  "ti,omap3-ssi-interface-clock" - interface clock with SSI specific HW handling
+  "ti,am35xx-interface-clock" - interface clock with AM35xx specific HW handling
+- #clock-cells : from common clock binding; shall be set to 0
+- clocks : link to phandle of parent clock
+- reg : base address for the control register
+
+Optional properties:
+- ti,bit-shift : bit shift for the bit enabling/disabling the clock (default 0)
+
+Examples:
+        aes1_ick: aes1_ick@48004a14 {
+                #clock-cells = <0>;
+                compatible = "ti,omap3-interface-clock";
+                clocks = <&security_l4_ick2>;
+                reg = <0x48004a14 0x4>;
+                ti,bit-shift = <3>;
+        };
+
+        cam_ick: cam_ick@48004f10 {
+                #clock-cells = <0>;
+                compatible = "ti,omap3-no-wait-interface-clock";
+                clocks = <&l4_ick>;
+                reg = <0x48004f10 0x4>;
+                ti,bit-shift = <0>;
+        };
+
+        ssi_ick_3430es2: ssi_ick_3430es2@48004a10 {
+                #clock-cells = <0>;
+                compatible = "ti,omap3-ssi-interface-clock";
+                clocks = <&ssi_l4_ick>;
+                reg = <0x48004a10 0x4>;
+                ti,bit-shift = <0>;
+        };