clock_am43xx:Set the MAC clock to /5 for OPP100

When EMAC is in the boot order, the boot ROM sets OPP50 and the
MAC clock is set to /2. SPL needs to change it to /5 for Ethernet
to generate the correct txclk. This patch sets it correctly.

Signed-off-by: Steve Kipisz <s-kipisz2@ti.com>

arch/arm/cpu/armv7/am33xx/clock_am43xx.c

@@ -118,4 +118,7 @@ void enable_basic_clocks(void)
 
 	/* Select the Master osc clk as Timer2 clock source */
 	writel(0x1, &cmdpll->clktimer2clk);
+
+	/* For OPP100 the mac clock should be /5. */
+	writel(0x4, &cmdpll->clkselmacclk);
 }

arch/arm/include/asm/arch-am33xx/cpu.h

@@ -400,6 +400,8 @@ struct prm_device_inst {
 struct cm_dpll {
 	unsigned int resv1;
 	unsigned int clktimer2clk;	/* offset 0x04 */
+	unsigned int resv2[11];
+	unsigned int clkselmacclk;	/* offset 0x34 */ 
 };
 #endif /* CONFIG_AM43XX */