[PATCH v2] mfd: cs42l43: Add support for new cs42l44 variant

[PATCH v2] mfd: cs42l43: Add support for new cs42l44 variant

[Charles Keepax]

The cs42l44 is a cost optimised variant of cs42l43b. Add basic support
for this new device.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---

Changes since v1:
 - Rebased since v1 to no longer rely on Uwe's series.

 drivers/mfd/cs42l43-i2c.c        |  2 ++
 drivers/mfd/cs42l43-sdw.c        |  1 +
 drivers/mfd/cs42l43.c            | 18 ++++++++++++------
 include/linux/mfd/cs42l43-regs.h |  1 +
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/cs42l43-i2c.c b/drivers/mfd/cs42l43-i2c.c
index 4db452b41220d..0a0c34d5982e4 100644
--- a/drivers/mfd/cs42l43-i2c.c
+++ b/drivers/mfd/cs42l43-i2c.c
@@ -59,6 +59,7 @@ static int cs42l43_i2c_probe(struct i2c_client *i2c)
 static const struct of_device_id cs42l43_of_match[] = {
 	{ .compatible = "cirrus,cs42l43", .data = (void *)CS42L43_DEVID_VAL },
 	{ .compatible = "cirrus,cs42l43b", .data = (void *)CS42L43B_DEVID_VAL },
+	{ .compatible = "cirrus,cs42l44", .data = (void *)CS42L43B_DEVID_VAL },
 	{}
 };
 MODULE_DEVICE_TABLE(of, cs42l43_of_match);
@@ -68,6 +69,7 @@ MODULE_DEVICE_TABLE(of, cs42l43_of_match);
 static const struct acpi_device_id cs42l43_acpi_match[] = {
 	{ "CSC4243", CS42L43_DEVID_VAL },
 	{ "CSC2A3B", CS42L43B_DEVID_VAL },
+	{ "CSC4244", CS42L43B_DEVID_VAL },
 	{}
 };
 MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match);
diff --git a/drivers/mfd/cs42l43-sdw.c b/drivers/mfd/cs42l43-sdw.c
index 6ccfdcd3f6698..81dd19df53685 100644
--- a/drivers/mfd/cs42l43-sdw.c
+++ b/drivers/mfd/cs42l43-sdw.c
@@ -184,6 +184,7 @@ static int cs42l43_sdw_probe(struct sdw_slave *sdw, const struct sdw_device_id *
 static const struct sdw_device_id cs42l43_sdw_id[] = {
 	SDW_SLAVE_ENTRY(0x01FA, 0x4243, (void *)CS42L43_DEVID_VAL),
 	SDW_SLAVE_ENTRY(0x01FA, 0x2A3B, (void *)CS42L43B_DEVID_VAL),
+	SDW_SLAVE_ENTRY(0x01FA, 0x4244, (void *)CS42L43B_DEVID_VAL),
 	{ }
 };
 MODULE_DEVICE_TABLE(sdw, cs42l43_sdw_id);
diff --git a/drivers/mfd/cs42l43.c b/drivers/mfd/cs42l43.c
index 4212ebcca60b5..592677e1db41a 100644
--- a/drivers/mfd/cs42l43.c
+++ b/drivers/mfd/cs42l43.c
@@ -959,6 +959,7 @@ static void cs42l43_boot_work(struct work_struct *work)
 {
 	struct cs42l43 *cs42l43 = container_of(work, struct cs42l43, boot_work);
 	unsigned int devid, revid, otp;
+	bool valid_id;
 	int ret;
 
 	ret = cs42l43_wait_for_attach(cs42l43);
@@ -973,19 +974,24 @@ static void cs42l43_boot_work(struct work_struct *work)
 
 	switch (devid) {
 	case CS42L43_DEVID_VAL:
+		valid_id = (cs42l43->variant_id == CS42L43_DEVID_VAL);
+		break;
 	case CS42L43B_DEVID_VAL:
-		if (devid != cs42l43->variant_id) {
-			dev_err(cs42l43->dev,
-				"Device ID (0x%06x) does not match variant ID (0x%06lx)\n",
-				devid, cs42l43->variant_id);
-			goto err;
-		}
+	case CS42L44_DEVID_VAL:
+		valid_id = (cs42l43->variant_id == CS42L43B_DEVID_VAL);
 		break;
 	default:
 		dev_err(cs42l43->dev, "Unrecognised devid: 0x%06x\n", devid);
 		goto err;
 	}
 
+	if (!valid_id) {
+		dev_err(cs42l43->dev,
+			"Device ID (0x%06x) does not match variant ID (0x%06lx)\n",
+			devid, cs42l43->variant_id);
+		goto err;
+	}
+
 	ret = regmap_read(cs42l43->regmap, CS42L43_REVID, &revid);
 	if (ret) {
 		dev_err(cs42l43->dev, "Failed to read rev: %d\n", ret);
diff --git a/include/linux/mfd/cs42l43-regs.h b/include/linux/mfd/cs42l43-regs.h
index 68831f113589d..4c00ceae8b461 100644
--- a/include/linux/mfd/cs42l43-regs.h
+++ b/include/linux/mfd/cs42l43-regs.h
@@ -1183,6 +1183,7 @@
 
 /* CS42L43B VARIANT REGISTERS */
 #define CS42L43B_DEVID_VAL					0x0042A43B
+#define CS42L44_DEVID_VAL					0x00042A44
 
 #define CS42L43B_DECIM_VOL_CTRL_CH1_CH2				0x00008280
 #define CS42L43B_DECIM_VOL_CTRL_CH3_CH4				0x00008284
-- 
2.47.3