clk: TI CDCE706 clock synthesizer driver

The driver allows using CDCE706 in its default configuration recorded in
EEPROM and adjusting of synthesized clocks by consumers.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>

Documentation/devicetree/bindings/clock/ti,cdce706.txt

+Bindings for Texas Instruments CDCE706 programmable 3-PLL clock
+synthesizer/multiplier/divider.
+
+Reference: http://www.ti.com/lit/ds/symlink/cdce706.pdf
+
+I2C device node required properties:
+- compatible: shall be "ti,cdce706".
+- reg: i2c device address, shall be in range [0x68...0x6b].
+- #clock-cells: from common clock binding; shall be set to 1.
+- clocks: from common clock binding; list of parent clock
+  handles, shall be reference clock(s) connected to CLK_IN0
+  and CLK_IN1 pins.
+- clock-names: shall be clk_in0 and/or clk_in1. Use clk_in0
+  in case of crystal oscillator or differential signal input
+  configuration. Use clk_in0 and clk_in1 in case of independent
+  single-ended LVCMOS inputs configuration.
+
+Example:
+
+	clocks {
+		clk54: clk54 {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <54000000>;
+		};
+	};
+	...
+	i2c0: i2c-master@0d090000 {
+		...
+		cdce706: clock-synth@69 {
+			compatible = "ti,cdce706";
+			#clock-cells = <1>;
+			reg = <0x69>;
+			clocks = <&clk54>;
+			clock-names = "clk_in0";
+		};
+	};
+	...
+	simple-audio-card,codec {
+		...
+		clocks = <&cdce706 4>;
+	};

MAINTAINERS

@@ -9536,6 +9536,11 @@ L:	linux-pm@vger.kernel.org
 S:	Supported
 F:	drivers/thermal/ti-soc-thermal/
 
+TI CDCE706 CLOCK DRIVER
+M:	Max Filippov <jcmvbkbc@gmail.com>
+S:	Maintained
+F:	drivers/clk/clk-cdce706.c
+
 TI CLOCK DRIVER
 M:	Tero Kristo <t-kristo@ti.com>
 L:	linux-omap@vger.kernel.org

drivers/clk/Kconfig

@@ -134,6 +134,14 @@ config COMMON_CLK_PXA
 	---help---
 	  Sypport for the Marvell PXA SoC.
 
+config COMMON_CLK_CDCE706
+	tristate "Clock driver for TI CDCE706 clock synthesizer"
+	depends on I2C
+	select REGMAP_I2C
+	select RATIONAL
+	---help---
+	  This driver supports TI CDCE706 programmable 3-PLL clock synthesizer.
+
 source "drivers/clk/qcom/Kconfig"
 
 endmenu

drivers/clk/Makefile

@@ -19,6 +19,7 @@ endif
 obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN)	+= clk-axi-clkgen.o
 obj-$(CONFIG_ARCH_AXXIA)		+= clk-axm5516.o
 obj-$(CONFIG_ARCH_BCM2835)		+= clk-bcm2835.o
+obj-$(CONFIG_COMMON_CLK_CDCE706)	+= clk-cdce706.o
 obj-$(CONFIG_ARCH_CLPS711X)		+= clk-clps711x.o
 obj-$(CONFIG_ARCH_EFM32)		+= clk-efm32gg.o
 obj-$(CONFIG_ARCH_HIGHBANK)		+= clk-highbank.o