mx6: clock: Pass the frequency as argument of enable_fec_anatop_clock()

Provide an argument to enable_fec_anatop_clock() to specify the clock frequency
that will be generated.

No changes are made to mx6slevk, which uses the default 50MHz fec clock.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/mx6/clock.c

@@ -323,7 +323,7 @@ static u32 get_mmdc_ch0_clk(void)
 #endif
 
 #ifdef CONFIG_FEC_MXC
-int enable_fec_anatop_clock(void)
+int enable_fec_anatop_clock(enum enet_freq freq)
 {
 	u32 reg = 0;
 	s32 timeout = 100000;
@@ -331,7 +331,13 @@ int enable_fec_anatop_clock(void)
 	struct anatop_regs __iomem *anatop =
 		(struct anatop_regs __iomem *)ANATOP_BASE_ADDR;
 
+	if (freq < ENET_25MHz || freq > ENET_125MHz)
+		return -EINVAL;
+
 	reg = readl(&anatop->pll_enet);
+	reg &= ~BM_ANADIG_PLL_ENET_DIV_SELECT;
+	reg |= freq;
+
 	if ((reg & BM_ANADIG_PLL_ENET_POWERDOWN) ||
 	    (!(reg & BM_ANADIG_PLL_ENET_LOCK))) {
 		reg &= ~BM_ANADIG_PLL_ENET_POWERDOWN;

arch/arm/include/asm/arch-mx6/clock.h

@@ -42,6 +42,13 @@ enum mxc_clock {
 	MXC_I2C_CLK,
 };
 
+enum enet_freq {
+	ENET_25MHz,
+	ENET_50MHz,
+	ENET_100MHz,
+	ENET_125MHz,
+};
+
 u32 imx_get_uartclk(void);
 u32 imx_get_fecclk(void);
 unsigned int mxc_get_clock(enum mxc_clock clk);
@@ -50,5 +57,5 @@ void enable_usboh3_clk(unsigned char enable);
 int enable_sata_clock(void);
 int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
 void enable_ipu_clock(void);
-int enable_fec_anatop_clock(void);
+int enable_fec_anatop_clock(enum enet_freq freq);
 #endif /* __ASM_ARCH_CLOCK_H */

board/freescale/mx6slevk/mx6slevk.c

@@ -120,7 +120,7 @@ static int setup_fec(void)
 	/* clear gpr1[14], gpr1[18:17] to select anatop clock */
 	clrsetbits_le32(&iomuxc_regs->gpr[1], IOMUX_GPR1_FEC_MASK, 0);
 
-	ret = enable_fec_anatop_clock();
+	ret = enable_fec_anatop_clock(ENET_50MHz);
 	if (ret)
 		return ret;