clk: lpc32xx: add common clock framework driver

Add support for all configurable clocks found on NXP LPC32xx SoC.

The list contains several heterogenous groups of clocks:
* system clocks including multiple dividers and muxes,
* x397 PLL, HCLK PLL and USB PLL,
* peripheral clocks inherited from rtc, hclk and pclk,
* USB controller clocks: AHB slave, I2C, OTG, OHCI and device.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>

drivers/clk/Kconfig

@@ -161,6 +161,12 @@ config COMMON_CLK_KEYSTONE
           Supports clock drivers for Keystone based SOCs. These SOCs have local
 	  a power sleep control module that gate the clock to the IPs and PLLs.
 
+config COMMON_CLK_NXP
+	def_bool COMMON_CLK && (ARCH_LPC18XX || ARCH_LPC32XX)
+	select REGMAP_MMIO if ARCH_LPC32XX
+	---help---
+	  Support for clock providers on NXP platforms.
+
 config COMMON_CLK_PALMAS
 	tristate "Clock driver for TI Palmas devices"
 	depends on MFD_PALMAS

drivers/clk/nxp/Makefile

@@ -1,2 +1,3 @@
 obj-$(CONFIG_ARCH_LPC18XX)	+= clk-lpc18xx-cgu.o
 obj-$(CONFIG_ARCH_LPC18XX)	+= clk-lpc18xx-ccu.o
+obj-$(CONFIG_ARCH_LPC32XX)	+= clk-lpc32xx.o