[PATCH 1/2] mfd: cs42l43: Add load detection register needed for cs42l43b

[Charles Keepax <ckeepax@opensource.cirrus.com>]

The headphone load detection procedure on cs42l43b is slightly different
and requires a register that wasn't used on previous versions of the
chip. Add that register into the driver.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 drivers/mfd/cs42l43.c            | 1 +
 include/linux/mfd/cs42l43-regs.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/mfd/cs42l43.c b/drivers/mfd/cs42l43.c
index a83b62064dae6..4e5d82c355ee3 100644
--- a/drivers/mfd/cs42l43.c
+++ b/drivers/mfd/cs42l43.c
@@ -425,6 +425,7 @@ bool cs42l43_precious_register(struct device *dev, unsigned int reg)
 	case CS42L43_RX_DATA:
 	case CS42L43_DECIM_INT ... CS42L43_HPOUT_INT:
 	case CS42L43_MCU_SW_REV ... CS42L43_MCU_RAM_MAX:
+	case CS42L43B_LOAD_DET_SEL:
 		return true;
 	default:
 		return false;
diff --git a/include/linux/mfd/cs42l43-regs.h b/include/linux/mfd/cs42l43-regs.h
index 4c00ceae8b461..924438655c630 100644
--- a/include/linux/mfd/cs42l43-regs.h
+++ b/include/linux/mfd/cs42l43-regs.h
@@ -1204,6 +1204,8 @@
 #define CS42L43B_ISRC2DEC3_INPUT1				0x0000C7A0
 #define CS42L43B_ISRC2DEC4_INPUT1				0x0000C7B0
 
+#define CS42L43B_LOAD_DET_SEL					0x000170E8
+
 #define CS42L43B_FW_MISSION_CTRL_NEED_CONFIGS			0x00117E00
 #define CS42L43B_FW_MISSION_CTRL_HAVE_CONFIGS			0x00117E04
 #define CS42L43B_FW_MISSION_CTRL_PATCH_START_ADDR_REG		0x00117E08
-- 
2.47.3