[PATCH 2/2] i2c: cadence: Add support for Axiado AX3000

[Swark Yang]

The Axiado AX3000 SoC integrates a Cadence I2C controller
that supports SMBus Quick commands.

Introduce the "axiado,ax3000-i2c" compatible string and
add a new quirk CDNS_I2C_QUIRK_SMBUS_QUICK to enable
this functionality. This allows the controller to support
I2C_FUNC_SMBUS_QUICK, enabling features such as bus scanning
via quick write commands.

Signed-off-by: Swark Yang <syang at axiado.com>
---
 drivers/i2c/busses/i2c-cadence.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index 0fb728ade92e..8079c045f936 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -128,6 +128,7 @@
 #define CDNS_I2C_TIMEOUT_MAX	0xFF
 
 #define CDNS_I2C_BROKEN_HOLD_BIT	BIT(0)
+#define CDNS_I2C_QUIRKS_ENABLE_SMBUS_QUICK_CFG BIT(1)
 #define CDNS_I2C_POLL_US	100000
 #define CDNS_I2C_POLL_US_ATOMIC	10
 #define CDNS_I2C_TIMEOUT_US	500000
@@ -1175,10 +1176,14 @@ static int cdns_i2c_master_xfer_atomic(struct i2c_adapter *adap, struct i2c_msg
  */
 static u32 cdns_i2c_func(struct i2c_adapter *adap)
 {
+	struct cdns_i2c *id = adap->algo_data;
 	u32 func = I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR |
 			(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) |
 			I2C_FUNC_SMBUS_BLOCK_DATA;
 
+	if (id->quirks & CDNS_I2C_QUIRKS_ENABLE_SMBUS_QUICK_CFG)
+		func |= I2C_FUNC_SMBUS_QUICK;
+
 #if IS_ENABLED(CONFIG_I2C_SLAVE)
 	func |= I2C_FUNC_SLAVE;
 #endif
@@ -1442,9 +1447,14 @@ static const struct cdns_platform_data r1p10_i2c_def = {
 	.quirks = CDNS_I2C_BROKEN_HOLD_BIT,
 };
 
+static const struct cdns_platform_data ax3000_i2c_def = {
+	.quirks = CDNS_I2C_QUIRKS_ENABLE_SMBUS_QUICK_CFG,
+};
+
 static const struct of_device_id cdns_i2c_of_match[] = {
 	{ .compatible = "cdns,i2c-r1p10", .data = &r1p10_i2c_def },
 	{ .compatible = "cdns,i2c-r1p14",},
+	{ .compatible = "axiado,ax3000-i2c", .data = &ax3000_i2c_def },
 	{ /* end of table */ }
 };
 MODULE_DEVICE_TABLE(of, cdns_i2c_of_match);

-- 
2.34.1