misc: at25: Make use of device property API

Make use of device property API in this driver so that both DT and ACPI
based systems can use this driver.

In addition we hard-code the name of the chip to be "at25" for the
reason that there is no common mechanism to fetch name of the firmware
node. The only existing user (arch/arm/boot/dts/phy3250.dts) uses the
same name so it should continue to work.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 13 insertions, 21 deletions

diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
index 634f72929e12..0a1af93ec638 100644
--- a/drivers/misc/eeprom/at25.c
+++ b/drivers/misc/eeprom/at25.c
@@ -18,7 +18,7 @@
 
 #include <linux/spi/spi.h>
 #include <linux/spi/eeprom.h>
-#include <linux/of.h>
+#include <linux/property.h>
 
 /*
  * NOTE: this is an *EEPROM* driver.  The vagaries of product naming
@@ -301,35 +301,33 @@ static ssize_t at25_mem_write(struct memory_accessor *mem, const char *buf,
 
 /*-------------------------------------------------------------------------*/
 
-static int at25_np_to_chip(struct device *dev,
-                           struct device_node *np,
-                           struct spi_eeprom *chip)
+static int at25_fw_to_chip(struct device *dev, struct spi_eeprom *chip)
 {
         u32 val;
 
         memset(chip, 0, sizeof(*chip));
-        strncpy(chip->name, np->name, sizeof(chip->name));
+        strncpy(chip->name, "at25", sizeof(chip->name));
 
-        if (of_property_read_u32(np, "size", &val) == 0 ||
-            of_property_read_u32(np, "at25,byte-len", &val) == 0) {
+        if (device_property_read_u32(dev, "size", &val) == 0 ||
+            device_property_read_u32(dev, "at25,byte-len", &val) == 0) {
                 chip->byte_len = val;
         } else {
                 dev_err(dev, "Error: missing \"size\" property\n");
                 return -ENODEV;
         }
 
-        if (of_property_read_u32(np, "pagesize", &val) == 0 ||
-            of_property_read_u32(np, "at25,page-size", &val) == 0) {
+        if (device_property_read_u32(dev, "pagesize", &val) == 0 ||
+            device_property_read_u32(dev, "at25,page-size", &val) == 0) {
                 chip->page_size = (u16)val;
         } else {
                 dev_err(dev, "Error: missing \"pagesize\" property\n");
                 return -ENODEV;
         }
 
-        if (of_property_read_u32(np, "at25,addr-mode", &val) == 0) {
+        if (device_property_read_u32(dev, "at25,addr-mode", &val) == 0) {
                 chip->flags = (u16)val;
         } else {
-                if (of_property_read_u32(np, "address-width", &val)) {
+                if (device_property_read_u32(dev, "address-width", &val)) {
                         dev_err(dev,
                                 "Error: missing \"address-width\" property\n");
                         return -ENODEV;
@@ -350,7 +348,7 @@ static int at25_np_to_chip(struct device *dev,
                                 val);
                         return -ENODEV;
                 }
-                if (of_find_property(np, "read-only", NULL))
+                if (device_property_present(dev, "read-only"))
                         chip->flags |= EE_READONLY;
         }
         return 0;
@@ -360,21 +358,15 @@ static int at25_probe(struct spi_device *spi)
 {
         struct at25_data        *at25 = NULL;
         struct spi_eeprom       chip;
-        struct device_node      *np = spi->dev.of_node;
         int                     err;
         int                     sr;
         int                     addrlen;
 
         /* Chip description */
         if (!spi->dev.platform_data) {
-                if (np) {
-                        err = at25_np_to_chip(&spi->dev, np, &chip);
-                        if (err)
-                                return err;
-                } else {
-                        dev_err(&spi->dev, "Error: no chip description\n");
-                        return -ENODEV;
-                }
+                err = at25_fw_to_chip(&spi->dev, &chip);
+                if (err)
+                        return err;
         } else
                 chip = *(struct spi_eeprom *)spi->dev.platform_data;