[U-Boot] [PATCH v4 04/22] vybrid: clock: Provide enable_i2c_clk() function for Vybrid

[Lukasz Majewski]

Provide function to enable I2C clocks for vf610 - in the generic code.
This function overrides the default weak function implementation (which
only returns 1).

Signed-off-by: Lukasz Majewski <lukma at denx.de>
Tested-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>

---

Changes in v4: None
Changes in v3:
- Add code to enable I2C0 code as suggested by Stefan (so the code can be
  reused by other boards without regressions)
- Exclude the pcm052.c related code to a separate patch

Changes in v2: None

 arch/arm/cpu/armv7/vf610/generic.c      | 22 ++++++++++++++++++++++
 arch/arm/include/asm/arch-vf610/clock.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/arch/arm/cpu/armv7/vf610/generic.c b/arch/arm/cpu/armv7/vf610/generic.c
index cbd3391918..e0c0b1bcb0 100644
--- a/arch/arm/cpu/armv7/vf610/generic.c
+++ b/arch/arm/cpu/armv7/vf610/generic.c
@@ -375,3 +375,25 @@ void enable_caches(void)
 	mmu_set_region_dcache_behaviour(IRAM_BASE_ADDR, IRAM_SIZE, option);
 }
 #endif
+
+#ifdef CONFIG_SYS_I2C_MXC
+/* i2c_num can be from 0 - 3 */
+int enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
+{
+	struct ccm_reg *ccm = (struct ccm_reg *)CCM_BASE_ADDR;
+
+	switch (i2c_num) {
+	case 0:
+		clrsetbits_le32(&ccm->ccgr4, CCM_CCGR4_I2C0_CTRL_MASK,
+				CCM_CCGR4_I2C0_CTRL_MASK);
+	case 2:
+		clrsetbits_le32(&ccm->ccgr10, CCM_CCGR10_I2C2_CTRL_MASK,
+				CCM_CCGR10_I2C2_CTRL_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+#endif
diff --git a/arch/arm/include/asm/arch-vf610/clock.h b/arch/arm/include/asm/arch-vf610/clock.h
index 3bd73a01f3..72184fd608 100644
--- a/arch/arm/include/asm/arch-vf610/clock.h
+++ b/arch/arm/include/asm/arch-vf610/clock.h
@@ -22,6 +22,9 @@ enum mxc_clock {
 void enable_ocotp_clk(unsigned char enable);
 unsigned int mxc_get_clock(enum mxc_clock clk);
 u32 get_lpuart_clk(void);
+#ifdef CONFIG_SYS_I2C_MXC
+int enable_i2c_clk(unsigned char enable, unsigned int i2c_num);
+#endif
 
 #define imx_get_fecclk() mxc_get_clock(MXC_FEC_CLK)
 
-- 
2.11.0