nitrogen6x: Setup CCM_CCOSR register

CKO1 drives sgtl5000 codec clock on nitrogen boards and wandboard.

Doing this setup in the bootloader will allow us to remove a lot of code in
arch/arm/mach-imx/mach-imx6q.c from the mainline kernel.

Also, according to Eric Nelson: "enabling the clock <in the bootloader> will
remove squeal after an ungraceful reboot (watchdog) if hooked up to speakers."

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

diff --git a/arch/arm/include/asm/arch-mx6/crm_regs.h b/arch/arm/include/asm/arch-mx6/crm_regs.h
index f16bd92abcca5303d183296b42911cdb39a6ea2d..aa9747ce334662d3f6192aa0f42092c224c2decb 100644 (file)
--- a/arch/arm/include/asm/arch-mx6/crm_regs.h
+++ b/arch/arm/include/asm/arch-mx6/crm_regs.h
@@ -20,6 +20,7 @@
 #ifndef __ARCH_ARM_MACH_MX6_CCM_REGS_H__
 #define __ARCH_ARM_MACH_MX6_CCM_REGS_H__
 
+#define CCM_CCOSR              0x020c4060
 #define CCM_CCGR0              0x020C4068
 #define CCM_CCGR1              0x020C406c
 #define CCM_CCGR2              0x020C4070

diff --git a/board/boundary/nitrogen6x/clocks.cfg b/board/boundary/nitrogen6x/clocks.cfg
index e7d1f86cdb1bff1204fd0fea3e7cd5e6c5480ec9..0a3b47b5d0486bc1503694dd3ceecef629c6205e 100644 (file)
--- a/board/boundary/nitrogen6x/clocks.cfg
+++ b/board/boundary/nitrogen6x/clocks.cfg
@@ -44,3 +44,14 @@ DATA 4, MX6_IOMUXC_GPR4, 0xF00000CF
 /* set IPU AXI-id0 Qos=0xf(bypass) AXI-id1 Qos=0x7 */
 DATA 4, MX6_IOMUXC_GPR6, 0x007F007F
 DATA 4, MX6_IOMUXC_GPR7, 0x007F007F
+
+/*
+ * Setup CCM_CCOSR register as follows:
+ *
+ * cko1_en  = 1           --> CKO1 enabled
+ * cko1_div = 111  --> divide by 8
+ * cko1_sel = 1011 --> ahb_clk_root
+ *
+ * This sets CKO1 at ahb_clk_root/8 = 132/8 = 16.5 MHz
+ */
+DATA 4, CCM_CCOSR, 0x000000fb