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Subject[PATCH v2 3/5] misc: eeprom_93xx46: Implement eeprom_93xx46 DT bindings.
Date
This commit implements bindings in the eeprom_93xx46 driver allowing
device word size and read-only attributes to be specified via
devicetree.

Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com>
---
drivers/misc/eeprom/eeprom_93xx46.c | 62 +++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/drivers/misc/eeprom/eeprom_93xx46.c b/drivers/misc/eeprom/eeprom_93xx46.c
index e1bf0a5..1f29d9a 100644
--- a/drivers/misc/eeprom/eeprom_93xx46.c
+++ b/drivers/misc/eeprom/eeprom_93xx46.c
@@ -13,6 +13,8 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>
@@ -294,12 +296,71 @@ static ssize_t eeprom_93xx46_store_erase(struct device *dev,
}
static DEVICE_ATTR(erase, S_IWUSR, NULL, eeprom_93xx46_store_erase);

+#ifdef CONFIG_OF
+static const struct of_device_id eeprom_93xx46_of_table[] = {
+ { .compatible = "eeprom-93xx46", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, eeprom_93xx46_of_table);
+
+static int eeprom_93xx46_probe_dt(struct spi_device *spi)
+{
+ struct device_node *np = spi->dev.of_node;
+ struct eeprom_93xx46_platform_data *pd;
+ u32 tmp;
+ int ret;
+
+ if (!of_match_device(eeprom_93xx46_of_table, &spi->dev))
+ return 0;
+
+ pd = devm_kzalloc(&spi->dev, sizeof(*pd), GFP_KERNEL);
+ if (!pd)
+ return -ENOMEM;
+
+ ret = of_property_read_u32(np, "data-size", &tmp);
+ if (ret < 0) {
+ dev_err(&spi->dev, "data-size property not found\n");
+ goto error_free;
+ }
+
+ if (tmp == 8) {
+ pd->flags |= EE_ADDR8;
+ } else if (tmp == 16) {
+ pd->flags |= EE_ADDR16;
+ } else {
+ dev_err(&spi->dev, "invalid data-size (%d)\n", tmp);
+ goto error_free;
+ }
+
+ if (of_property_read_bool(np, "read-only"))
+ pd->flags |= EE_READONLY;
+
+ spi->dev.platform_data = pd;
+
+ return 1;
+
+error_free:
+ devm_kfree(&spi->dev, pd);
+ return ret;
+}
+
+#else
+static inline int eeprom_93xx46_probe_dt(struct spi_device *spi)
+{
+ return 0;
+}
+#endif
+
static int eeprom_93xx46_probe(struct spi_device *spi)
{
struct eeprom_93xx46_platform_data *pd;
struct eeprom_93xx46_dev *edev;
int err;

+ err = eeprom_93xx46_probe_dt(spi);
+ if (err < 0)
+ return err;
+
pd = spi->dev.platform_data;
if (!pd) {
dev_err(&spi->dev, "missing platform data\n");
@@ -370,6 +431,7 @@ static int eeprom_93xx46_remove(struct spi_device *spi)
static struct spi_driver eeprom_93xx46_driver = {
.driver = {
.name = "93xx46",
+ .of_match_table = eeprom_93xx46_of_table,
},
.probe = eeprom_93xx46_probe,
.remove = eeprom_93xx46_remove,
--
2.4.10


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