Add TI CDCE925 I2C controlled clock synthesizer driver

This driver supports the TI CDCE925 programmable clock synthesizer.
The chip contains two PLLs with spread-spectrum clocking support and
five output dividers. The driver only supports the following setup,
and uses a fixed setting for the output muxes:
  Y1 is derived from the input clock
  Y2 and Y3 derive from PLL1
  Y4 and Y5 derive from PLL2
Given a target output frequency, the driver will set the PLL and
divider to best approximate the desired output.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Michael Turquette <mturquette@linaro.org>

drivers/clk/Kconfig

@@ -78,6 +78,23 @@ config COMMON_CLK_SI570
 	  This driver supports Silicon Labs 570/571/598/599 programmable
 	  clock generators.
 
+config COMMON_CLK_CDCE925
+	tristate "Clock driver for TI CDCE925 devices"
+	depends on I2C
+	depends on OF
+	select REGMAP_I2C
+	help
+	---help---
+	  This driver supports the TI CDCE925 programmable clock synthesizer.
+	  The chip contains two PLLs with spread-spectrum clocking support and
+	  five output dividers. The driver only supports the following setup,
+	  and uses a fixed setting for the output muxes.
+	  Y1 is derived from the input clock
+	  Y2 and Y3 derive from PLL1
+	  Y4 and Y5 derive from PLL2
+	  Given a target output frequency, the driver will set the PLL and
+	  divider to best approximate the desired output.
+
 config COMMON_CLK_S2MPS11
 	tristate "Clock driver for S2MPS1X/S5M8767 MFD"
 	depends on MFD_SEC_CORE