clk: bcm2835: Add bindings for the auxiliary peripheral clock gates.

These will be used for enabling UART1, SPI1, and SPI2.
Signed-off-by: NEric Anholt <eric@anholt.net>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMichael Turquette <mturquette@baylibre.com>

Documentation/devicetree/bindings/clock/brcm,bcm2835-aux-clock.txt

+Broadcom BCM2835 auxiliary peripheral support
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The auxiliary peripherals (UART, SPI1, and SPI2) have a small register
+area controlling clock gating to the peripherals, and providing an IRQ
+status register.
+
+Required properties:
+- compatible:	Should be "brcm,bcm2835-aux"
+- #clock-cells:	Should be <1>. The permitted clock-specifier values can be
+		  found in include/dt-bindings/clock/bcm2835-aux.h
+- reg:		Specifies base physical address and size of the registers
+- clocks:	The parent clock phandle
+
+Example:
+
+	clocks: cprman@7e101000 {
+		compatible = "brcm,bcm2835-cprman";
+		#clock-cells = <1>;
+		reg = <0x7e101000 0x2000>;
+		clocks = <&clk_osc>;
+	};
+
+	aux: aux@0x7e215004 {
+		compatible = "brcm,bcm2835-aux";
+		#clock-cells = <1>;
+		reg = <0x7e215000 0x8>;
+		clocks = <&clocks BCM2835_CLOCK_VPU>;
+	};

include/dt-bindings/clock/bcm2835-aux.h

+/*
+ * Copyright (C) 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define BCM2835_AUX_CLOCK_UART		0
+#define BCM2835_AUX_CLOCK_SPI1		1
+#define BCM2835_AUX_CLOCK_SPI2		2
+#define BCM2835_AUX_CLOCK_COUNT		3