imx: mx6 add i2c4 clock support for i.MX6SX

Add I2C4 clock support for i.MX6SX. Since we use runtime check,
but not macro, we need to remove `#ifdef ..` in crm_regs.h, or
gcc will fail to compile the code succesfully.

Making the macros only for i.MX6SX open to other i.MX6x maybe not
a good choice, but we have runtime check.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>

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

@@ -126,6 +126,7 @@ int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
 {
 	u32 reg;
 	u32 mask;
+	u32 *addr;
 
 	if (i2c_num > 3)
 		return -EINVAL;
@@ -140,14 +141,19 @@ int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
 			reg &= ~mask;
 		__raw_writel(reg, &imx_ccm->CCGR2);
 	} else {
-		mask = MXC_CCM_CCGR_CG_MASK
-			<< (MXC_CCM_CCGR1_I2C4_SERIAL_OFFSET);
-		reg = __raw_readl(&imx_ccm->CCGR1);
+		if (is_cpu_type(MXC_CPU_MX6SX)) {
+			mask = MXC_CCM_CCGR6_I2C4_MASK;
+			addr = &imx_ccm->CCGR6;
+		} else {
+			mask = MXC_CCM_CCGR1_I2C4_SERIAL_MASK;
+			addr = &imx_ccm->CCGR1;
+		}
+		reg = __raw_readl(addr);
 		if (enable)
 			reg |= mask;
 		else
 			reg &= ~mask;
-		__raw_writel(reg, &imx_ccm->CCGR1);
+		__raw_writel(reg, addr);
 	}
 	return 0;
 }

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

@@ -740,7 +740,7 @@ struct mxc_ccm_reg {
 #define MXC_CCM_CCGR6_USDHC4_MASK		(3 << MXC_CCM_CCGR6_USDHC4_OFFSET)
 #define MXC_CCM_CCGR6_EMI_SLOW_OFFSET		10
 #define MXC_CCM_CCGR6_EMI_SLOW_MASK		(3 << MXC_CCM_CCGR6_EMI_SLOW_OFFSET)
-#ifdef CONFIG_MX6SX
+/* The following *CCGR6* exist only i.MX6SX */
 #define MXC_CCM_CCGR6_PWM8_OFFSET		16
 #define MXC_CCM_CCGR6_PWM8_MASK			(3 << MXC_CCM_CCGR6_PWM8_OFFSET)
 #define MXC_CCM_CCGR6_VADC_OFFSET		20
@@ -755,10 +755,9 @@ struct mxc_ccm_reg {
 #define MXC_CCM_CCGR6_PWM6_MASK			(3 << MXC_CCM_CCGR6_PWM6_OFFSET)
 #define MXC_CCM_CCGR6_PWM7_OFFSET		30
 #define MXC_CCM_CCGR6_PWM7_MASK			(3 << MXC_CCM_CCGR6_PWM7_OFFSET)
-#else
+/* The two does not exist on i.MX6SX */
 #define MXC_CCM_CCGR6_VDOAXICLK_OFFSET		12
 #define MXC_CCM_CCGR6_VDOAXICLK_MASK		(3 << MXC_CCM_CCGR6_VDOAXICLK_OFFSET)
-#endif
 
 #define BM_ANADIG_PLL_SYS_LOCK 0x80000000
 #define BP_ANADIG_PLL_SYS_RSVD0      20