[PATCH 3/3] spi/bcm63xx-hsspi: allow for probing through devicetree

[Jonas Gorski <jonas.gorski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Add required binding support to probe through device tree.

Signed-off-by: Jonas Gorski <jonas.gorski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-bcm63xx-hsspi.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c
index 79096d17ebde..77c249a22c9b 100644
--- a/drivers/spi/spi-bcm63xx-hsspi.c
+++ b/drivers/spi/spi-bcm63xx-hsspi.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/spi/spi.h>
 #include <linux/mutex.h>
+#include <linux/of.h>
 
 #define HSSPI_GLOBAL_CTRL_REG			0x0
 #define GLOBAL_CTRL_CS_POLARITY_SHIFT		0
@@ -91,6 +92,7 @@
 
 #define HSSPI_MAX_SYNC_CLOCK			30000000
 
+#define HSSPI_SPI_MAX_CS			8
 #define HSSPI_BUS_NUM				1 /* 0 is legacy SPI */
 
 struct bcm63xx_hsspi {
@@ -332,7 +334,7 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct clk *clk;
 	int irq, ret;
-	u32 reg, rate;
+	u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
@@ -382,8 +384,20 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
 	mutex_init(&bs->bus_mutex);
 	init_completion(&bs->done);
 
-	master->bus_num = HSSPI_BUS_NUM;
-	master->num_chipselect = 8;
+	if (dev->of_node) {
+		master->dev.of_node = dev->of_node;
+
+		of_property_read_u32(dev->of_node, "num-cs", &num_cs);
+		if (num_cs > 8) {
+			dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
+				 num_cs);
+			num_cs = HSSPI_SPI_MAX_CS;
+		}
+	} else {
+		master->bus_num = HSSPI_BUS_NUM;
+	}
+
+	master->num_chipselect = num_cs;
 	master->setup = bcm63xx_hsspi_setup;
 	master->transfer_one_message = bcm63xx_hsspi_transfer_one;
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
@@ -469,10 +483,16 @@ static int bcm63xx_hsspi_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(bcm63xx_hsspi_pm_ops, bcm63xx_hsspi_suspend,
 			 bcm63xx_hsspi_resume);
 
+static const struct of_device_id bcm63xx_hsspi_of_match[] = {
+	{ .compatible = "brcm,bcm6328-hsspi", },
+	{ },
+};
+
 static struct platform_driver bcm63xx_hsspi_driver = {
 	.driver = {
 		.name	= "bcm63xx-hsspi",
 		.pm	= &bcm63xx_hsspi_pm_ops,
+		.of_match_table = bcm63xx_hsspi_of_match,
 	},
 	.probe		= bcm63xx_hsspi_probe,
 	.remove		= bcm63xx_hsspi_remove,
-- 
2.11.0

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