i2c: i801: Add support for Intel Elkhart Lake

Add PCI ID for Intel Elkhart Lake PCH.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Documentation/i2c/busses/i2c-i801

@@ -37,6 +37,7 @@ Supported adapters:
   * Intel Cedar Fork (PCH)
   * Intel Ice Lake (PCH)
   * Intel Comet Lake (PCH)
+  * Intel Elkhart Lake (PCH)
    Datasheets: Publicly available at the Intel website
 
 On Intel Patsburg and later chipsets, both the normal host SMBus controller

drivers/i2c/busses/Kconfig

@@ -143,6 +143,7 @@ config I2C_I801
 	    Cedar Fork (PCH)
 	    Ice Lake (PCH)
 	    Comet Lake (PCH)
+	    Elkhart Lake (PCH)
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-i801.

drivers/i2c/busses/i2c-i801.c

@@ -72,6 +72,7 @@
  * Cedar Fork (PCH)		0x18df	32	hard	yes	yes	yes
  * Ice Lake-LP (PCH)		0x34a3	32	hard	yes	yes	yes
  * Comet Lake (PCH)		0x02a3	32	hard	yes	yes	yes
+ * Elkhart Lake (PCH)		0x4b23	32	hard	yes	yes	yes
  *
  * Features supported by this driver:
  * Software PEC				no
@@ -244,6 +245,7 @@
 #define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS	0xa2a3
 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS		0xa323
 #define PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS		0x02a3
+#define PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS		0x4b23
 
 struct i801_mux_config {
 	char *gpio_chip;
@@ -1071,6 +1073,7 @@ static const struct pci_device_id i801_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS) },
 	{ 0, }
 };
 
@@ -1683,6 +1686,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
 	case PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS:
 	case PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS:
+	case PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS:
 		priv->features |= FEATURE_BLOCK_PROC;
 		priv->features |= FEATURE_I2C_BLOCK_READ;
 		priv->features |= FEATURE_IRQ;