wlcore/wl12xx: spi: add device tree support

Add DT support for the wl1271 SPI WiFi.

Add documentation file for the wl1271 SPI WiFi.

Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Acked-by: Rob Herring <robh@kernel.org>
Tested-By: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

2 files changed, 44 insertions, 5 deletions

diff --git a/drivers/net/wireless/ti/wlcore/Kconfig b/drivers/net/wireless/ti/wlcore/Kconfig
index 969c9d79bfc8..8a8f1e711384 100644
--- a/drivers/net/wireless/ti/wlcore/Kconfig
+++ b/drivers/net/wireless/ti/wlcore/Kconfig
@@ -13,7 +13,7 @@ config WLCORE
 
 config WLCORE_SPI
         tristate "TI wlcore SPI support"
-        depends on WLCORE && SPI_MASTER
+        depends on WLCORE && SPI_MASTER && OF
         select CRC7
         ---help---
           This module adds support for the SPI interface of adapters using
diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c
index dec151247d0d..020ac1a4b408 100644
--- a/drivers/net/wireless/ti/wlcore/spi.c
+++ b/drivers/net/wireless/ti/wlcore/spi.c
@@ -30,6 +30,7 @@
 #include <linux/spi/spi.h>
 #include <linux/wl12xx.h>
 #include <linux/platform_device.h>
+#include <linux/of_irq.h>
 #include <linux/regulator/consumer.h>
 
 #include "wlcore.h"
@@ -357,6 +358,39 @@ static struct wl1271_if_operations spi_ops = {
         .set_block_size = NULL,
 };
 
+static const struct of_device_id wlcore_spi_of_match_table[] = {
+        { .compatible = "ti,wl1271" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table);
+
+/**
+ * wlcore_probe_of - DT node parsing.
+ * @spi: SPI slave device parameters.
+ * @res: resource parameters.
+ * @glue: wl12xx SPI bus to slave device glue parameters.
+ * @pdev_data: wlcore device parameters
+ */
+static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue,
+                           struct wlcore_platdev_data *pdev_data)
+{
+        struct device_node *dt_node = spi->dev.of_node;
+        int ret;
+
+        if (of_find_property(dt_node, "clock-xtal", NULL))
+                pdev_data->ref_clock_xtal = true;
+
+        ret = of_property_read_u32(dt_node, "ref-clock-frequency",
+                                   &pdev_data->ref_clock_freq);
+        if (IS_ERR_VALUE(ret)) {
+                dev_err(glue->dev,
+                        "can't get reference clock frequency (%d)\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
 static int wl1271_probe(struct spi_device *spi)
 {
         struct wl12xx_spi_glue *glue;
@@ -366,8 +400,6 @@ static int wl1271_probe(struct spi_device *spi)
 
         memset(&pdev_data, 0x00, sizeof(pdev_data));
 
-        /* TODO: add DT parsing when needed */
-
         pdev_data.if_ops = &spi_ops;
 
         glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
@@ -392,6 +424,13 @@ static int wl1271_probe(struct spi_device *spi)
                 return PTR_ERR(glue->reg);
         }
 
+        ret = wlcore_probe_of(spi, glue, &pdev_data);
+        if (IS_ERR_VALUE(ret)) {
+                dev_err(glue->dev,
+                        "can't get device tree parameters (%d)\n", ret);
+                return ret;
+        }
+
         ret = spi_setup(spi);
         if (ret < 0) {
                 dev_err(glue->dev, "spi_setup failed\n");
@@ -409,7 +448,7 @@ static int wl1271_probe(struct spi_device *spi)
         memset(res, 0x00, sizeof(res));
 
         res[0].start = spi->irq;
-        res[0].flags = IORESOURCE_IRQ;
+        res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(spi->irq);
         res[0].name = "irq";
 
         ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
@@ -447,10 +486,10 @@ static int wl1271_remove(struct spi_device *spi)
         return 0;
 }
 
-
 static struct spi_driver wl1271_spi_driver = {
         .driver = {
                 .name           = "wl1271_spi",
+                .of_match_table = of_match_ptr(wlcore_spi_of_match_table),
         },
 
         .probe          = wl1271_probe,