MLK-12495 mx6: Add LDO bypass support

Port LDO bypass support from v2015 to support the features:

1. Add check for 1.2GHz core speed. If Speed grading fuse is for 1.2GHz,
   enable LDO bypass and setup PMIC voltages. LDO bypass is dependent
   on the flatten device tree file.

2. We set WDOG_B in set_anatop_bypass() before, because it is the only case, but now
   on i.mx6sabreauto board, we didn't use ldo-bypass mode, but have to use WDOG_B to
   reboot whole board, so split these code to independent function so that board file
   can call it freely.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 5b87d04dba66fa45375d59648838ef89f559f75d)

1 files changed, 51 insertions, 0 deletions

diff --git a/board/freescale/mx6sxsabresd/mx6sxsabresd.c b/board/freescale/mx6sxsabresd/mx6sxsabresd.c
index d242072..ebb837b 100644
--- a/board/freescale/mx6sxsabresd/mx6sxsabresd.c
+++ b/board/freescale/mx6sxsabresd/mx6sxsabresd.c
@@ -329,6 +329,57 @@ int power_init_board(void)
 	return 0;
 }
 
+#ifdef CONFIG_LDO_BYPASS_CHECK
+void ldo_mode_set(int ldo_bypass)
+{
+	unsigned int value;
+	int is_400M;
+	u32 vddarm;
+	struct pmic *p = pmic_get("PFUZE100");
+
+	if (!p) {
+		printf("No PMIC found!\n");
+		return;
+	}
+
+	/* switch to ldo_bypass mode */
+	if (ldo_bypass) {
+		prep_anatop_bypass();
+		/* decrease VDDARM to 1.275V */
+		pmic_reg_read(p, PFUZE100_SW1ABVOL, &value);
+		value &= ~0x3f;
+		value |= PFUZE100_SW1ABC_SETP(12750);
+		pmic_reg_write(p, PFUZE100_SW1ABVOL, value);
+
+		/* decrease VDDSOC to 1.3V */
+		pmic_reg_read(p, PFUZE100_SW1CVOL, &value);
+		value &= ~0x3f;
+		value |= PFUZE100_SW1ABC_SETP(13000);
+		pmic_reg_write(p, PFUZE100_SW1CVOL, value);
+
+		is_400M = set_anatop_bypass(1);
+		if (is_400M)
+			vddarm = PFUZE100_SW1ABC_SETP(10750);
+		else
+			vddarm = PFUZE100_SW1ABC_SETP(11750);
+
+		pmic_reg_read(p, PFUZE100_SW1ABVOL, &value);
+		value &= ~0x3f;
+		value |= vddarm;
+		pmic_reg_write(p, PFUZE100_SW1ABVOL, value);
+
+		pmic_reg_read(p, PFUZE100_SW1CVOL, &value);
+		value &= ~0x3f;
+		value |= PFUZE100_SW1ABC_SETP(11750);
+		pmic_reg_write(p, PFUZE100_SW1CVOL, value);
+
+		finish_anatop_bypass();
+		printf("switch to ldo_bypass mode!\n");
+	}
+
+}
+#endif
+
 #ifdef CONFIG_USB_EHCI_MX6
 #define USB_OTHERREGS_OFFSET	0x800
 #define UCTRL_PWR_POL		(1 << 9)