mtd: dataflash: add device tree probe support

It adds device tree probe support for mtd_dataflash driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>

2 files changed, 30 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/mtd/atmel-dataflash.txt b/Documentation/devicetree/bindings/mtd/atmel-dataflash.txt
new file mode 100644
index 000000000000..ef66ddd01da0
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/atmel-dataflash.txt
@@ -0,0 +1,14 @@
+* Atmel Data Flash
+
+Required properties:
+- compatible : "atmel,<model>", "atmel,<series>", "atmel,dataflash".
+
+Example:
+
+flash@1 {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        compatible = "atmel,at45db321d", "atmel,at45", "atmel,dataflash";
+        spi-max-frequency = <25000000>;
+        reg = <1>;
+};
diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index 8f6b02c43b43..c86fa573c303 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -17,6 +17,8 @@
 #include <linux/mutex.h>
 #include <linux/err.h>
 #include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/flash.h>
@@ -24,7 +26,6 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 
-
 /*
  * DataFlash is a kind of SPI flash.  Most AT45 chips have two buffers in
  * each chip, which may be used for double buffered I/O; but this driver
@@ -98,6 +99,16 @@ struct dataflash {
         struct mtd_info         mtd;
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id dataflash_dt_ids[] = {
+        { .compatible = "atmel,at45", },
+        { .compatible = "atmel,dataflash", },
+        { /* sentinel */ }
+};
+#else
+#define dataflash_dt_ids NULL
+#endif
+
 /* ......................................................................... */
 
 /*
@@ -634,6 +645,7 @@ add_dataflash_otp(struct spi_device *spi, char *name,
 {
         struct dataflash                *priv;
         struct mtd_info                 *device;
+        struct mtd_part_parser_data     ppdata;
         struct flash_platform_data      *pdata = spi->dev.platform_data;
         char                            *otp_tag = "";
         int                             err = 0;
@@ -675,7 +687,8 @@ add_dataflash_otp(struct spi_device *spi, char *name,
                         pagesize, otp_tag);
         dev_set_drvdata(&spi->dev, priv);
 
-        err = mtd_device_parse_register(device, NULL, 0,
+        ppdata.of_node = spi->dev.of_node;
+        err = mtd_device_parse_register(device, NULL, &ppdata,
                         pdata ? pdata->parts : NULL,
                         pdata ? pdata->nr_parts : 0);
 
@@ -926,6 +939,7 @@ static struct spi_driver dataflash_driver = {
                 .name           = "mtd_dataflash",
                 .bus            = &spi_bus_type,
                 .owner          = THIS_MODULE,
+                .of_match_table = dataflash_dt_ids,
         },
 
         .probe          = dataflash_probe,