clk: lpc32xx: allow peripheral clock selection in device tree

This patch add the support to select the peripheral clock (PERIPH)
as a parent clock source using the "assigned-clock-parents"
parameter in the device tree.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/1464982475-24738-1-git-send-email-slemieux.tyco@gmail.com

drivers/clk/nxp/clk-lpc32xx.c

@@ -87,7 +87,7 @@ enum {
 
 enum {
 	/* Start from the last defined clock in dt bindings */
-	LPC32XX_CLK_ADC_DIV = LPC32XX_CLK_HCLK_PLL + 1,
+	LPC32XX_CLK_ADC_DIV = LPC32XX_CLK_PERIPH + 1,
 	LPC32XX_CLK_ADC_RTC,
 	LPC32XX_CLK_TEST1,
 	LPC32XX_CLK_TEST2,
@@ -99,7 +99,6 @@ enum {
 	LPC32XX_CLK_HCLK_DIV_PERIPH,
 	LPC32XX_CLK_HCLK_DIV,
 	LPC32XX_CLK_HCLK,
-	LPC32XX_CLK_PERIPH,
 	LPC32XX_CLK_ARM,
 	LPC32XX_CLK_ARM_VFP,
 

include/dt-bindings/clock/lpc32xx-clock.h

@@ -48,6 +48,7 @@
 #define LPC32XX_CLK_PWM2	33
 #define LPC32XX_CLK_ADC		34
 #define LPC32XX_CLK_HCLK_PLL	35
+#define LPC32XX_CLK_PERIPH	36
 
 /* LPC32XX USB clocks */
 #define LPC32XX_USB_CLK_I2C	1