CLK: TI: add autoidle support

TI clk driver now routes some of the basic clocks through own
registration routine to allow autoidle support. This routine just
checks a couple of device node properties and adds autoidle support
if required, and just passes the registration forward to basic clocks.

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, 39 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/ti/autoidle.txt b/Documentation/devicetree/bindings/clock/ti/autoidle.txt
new file mode 100644
index 00000000000..7c735dde9fe
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti/autoidle.txt
@@ -0,0 +1,39 @@
+Binding for Texas Instruments autoidle clock.
+
+Binding status: Unstable - ABI compatibility may be broken in the future
+
+This binding uses the common clock binding[1]. It assumes a register mapped
+clock which can be put to idle automatically by hardware based on the usage
+and a configuration bit setting. Autoidle clock is never an individual
+clock, it is always a derivative of some basic clock like a gate, divider,
+or fixed-factor.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- reg : offset for the register controlling the autoidle
+- ti,autoidle-shift : bit shift of the autoidle enable bit
+- ti,invert-autoidle-bit : autoidle is enabled by setting the bit to 0
+
+Examples:
+	dpll_core_m4_ck: dpll_core_m4_ck {
+		#clock-cells = <0>;
+		compatible = "ti,divider-clock";
+		clocks = <&dpll_core_x2_ck>;
+		ti,max-div = <31>;
+		ti,autoidle-shift = <8>;
+		reg = <0x2d38>;
+		ti,index-starts-at-one;
+		ti,invert-autoidle-bit;
+	};
+
+	dpll_usb_clkdcoldo_ck: dpll_usb_clkdcoldo_ck {
+		#clock-cells = <0>;
+		compatible = "ti,fixed-factor-clock";
+		clocks = <&dpll_usb_ck>;
+		ti,clock-div = <1>;
+		ti,autoidle-shift = <8>;
+		reg = <0x01b4>;
+		ti,clock-mult = <1>;
+		ti,invert-autoidle-bit;
+	};