[U-Boot] [PATCH 3/4] mx6: clock: Introduce disable_ipu_clock()

[Fabio Estevam <festevam@gmail.com>]

Introduce disable_ipu_clock(). This is done in preparation for
configuring the NoC registers on i.MX6QP in SPL.

Afer the NoC registers are set the IPU clocks can be disabled.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
 arch/arm/include/asm/arch-mx6/clock.h |  1 +
 arch/arm/mach-imx/mx6/clock.c         | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h
index a9481a5fea..f7760541a4 100644
--- a/arch/arm/include/asm/arch-mx6/clock.h
+++ b/arch/arm/include/asm/arch-mx6/clock.h
@@ -71,6 +71,7 @@ int enable_pcie_clock(void);
 int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
 int enable_spi_clk(unsigned char enable, unsigned spi_num);
 void enable_ipu_clock(void);
+void disable_ipu_clock(void);
 int enable_fec_anatop_clock(int fec_id, enum enet_freq freq);
 void enable_enet_clk(unsigned char enable);
 int enable_lcdif_clock(u32 base_addr, bool enable);
diff --git a/arch/arm/mach-imx/mx6/clock.c b/arch/arm/mach-imx/mx6/clock.c
index 9951f79106..e1e21e37a8 100644
--- a/arch/arm/mach-imx/mx6/clock.c
+++ b/arch/arm/mach-imx/mx6/clock.c
@@ -1287,6 +1287,18 @@ void enable_ipu_clock(void)
 		setbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_IPU2_IPU_MASK);
 	}
 }
+
+void disable_ipu_clock(void)
+{
+	struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+	clrbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_IPU1_IPU_MASK);
+
+	if (is_mx6dqp()) {
+		clrbits_le32(&mxc_ccm->CCGR6, MXC_CCM_CCGR6_PRG_CLK0_MASK);
+		clrbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_IPU2_IPU_MASK);
+	}
+}
 #endif
 
 #ifndef CONFIG_SPL_BUILD
-- 
2.17.1