[PATCH] spi: dw-pci: Add support for Intel Elkhart Lake PSE SPI

[Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>]

Add support for Intel(R) Programmable Services Engine (Intel(R) PSE) SPI
controller in Intel Elkhart Lake when interface is assigned to the host
processor.

Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
---
 drivers/spi/spi-dw-pci.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c
index c1e2401cace0..4e3a4c317636 100644
--- a/drivers/spi/spi-dw-pci.c
+++ b/drivers/spi/spi-dw-pci.c
@@ -19,6 +19,7 @@ struct spi_pci_desc {
 	int	(*setup)(struct dw_spi *);
 	u16	num_cs;
 	u16	bus_num;
+	u32	max_freq;
 };
 
 static struct spi_pci_desc spi_pci_mid_desc_1 = {
@@ -33,6 +34,12 @@ static struct spi_pci_desc spi_pci_mid_desc_2 = {
 	.bus_num = 1,
 };
 
+static struct spi_pci_desc spi_pci_ehl_desc = {
+	.num_cs = 1,
+	.bus_num = -1,
+	.max_freq = 100000000,
+};
+
 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct dw_spi *dws;
@@ -65,6 +72,7 @@ static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (desc) {
 		dws->num_cs = desc->num_cs;
 		dws->bus_num = desc->bus_num;
+		dws->max_freq = desc->max_freq;
 
 		if (desc->setup) {
 			ret = desc->setup(dws);
@@ -123,6 +131,11 @@ static const struct pci_device_id pci_ids[] = {
 	{ PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
 	/* Intel MID platform SPI controller 2 */
 	{ PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
+	/* Intel Elkhart Lake PSE SPI controllers */
+	{ PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc},
+	{ PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc},
+	{ PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc},
+	{ PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc},
 	{},
 };
 
-- 
2.20.1