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eeprom: at25: Add dt probe support 

The parsing code has been taken directly from Linux 3.15-rc5.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-05-14 16:21:50 +02:00
parent dc611863be
commit b3198966fd
1 changed files with 86 additions and 12 deletions
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98
drivers/eeprom/at25.c
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@ -238,27 +238,94 @@ static struct file_operations at25_fops = {
.lseek = dev_lseek_default,
};
static int at25_np_to_chip(struct device_d *dev,
struct device_node *np,
struct spi_eeprom *chip)
{
u32 val;
if (!IS_ENABLED(CONFIG_OFDEVICE))
return -ENODEV;
memset(chip, 0, sizeof(*chip));
strncpy(chip->name, np->name, sizeof(chip->name));
if (of_property_read_u32(np, "size", &val) == 0 ||
of_property_read_u32(np, "at25,byte-len", &val) == 0) {
chip->size = 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) {
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) {
chip->flags = (u16)val;
} else {
if (of_property_read_u32(np, "address-width", &val)) {
dev_err(dev,
"Error: missing \"address-width\" property\n");
return -ENODEV;
}
switch (val) {
case 8:
chip->flags |= EE_ADDR1;
break;
case 16:
chip->flags |= EE_ADDR2;
break;
case 24:
chip->flags |= EE_ADDR3;
break;
default:
dev_err(dev,
"Error: bad \"address-width\" property: %u\n",
val);
return -ENODEV;
}
if (of_find_property(np, "read-only", NULL))
chip->flags |= EE_READONLY;
}
return 0;
}
static int at25_probe(struct device_d *dev)
{
int err, sr;
int addrlen;
struct at25_data *at25 = NULL;
const struct spi_eeprom *chip;
struct spi_eeprom *chip;
at25 = xzalloc(sizeof(*at25));
/* Chip description */
chip = dev->platform_data;
if (!chip) {
dev_dbg(dev, "no chip description\n");
err = -ENODEV;
goto fail;
if (dev->device_node) {
err = at25_np_to_chip(dev, dev->device_node, &at25->chip);
if (err)
goto fail;
} else {
chip = dev->platform_data;
if (!chip) {
dev_dbg(dev, "no chip description\n");
err = -ENODEV;
goto fail;
}
at25->chip = *chip;
}
/* For now we only support 8/16/24 bit addressing */
if (chip->flags & EE_ADDR1) {
if (at25->chip.flags & EE_ADDR1) {
addrlen = 1;
} else if (chip->flags & EE_ADDR2) {
} else if (at25->chip.flags & EE_ADDR2) {
addrlen = 2;
} else if (chip->flags & EE_ADDR3) {
} else if (at25->chip.flags & EE_ADDR3) {
addrlen = 3;
} else {
dev_dbg(dev, "unsupported address type\n");
@ -266,14 +333,12 @@ static int at25_probe(struct device_d *dev)
goto fail;
}
at25 = xzalloc(sizeof(*at25));
at25->chip = *chip;
at25->addrlen = addrlen;
at25->spi = dev->type_data;
at25->spi->mode = SPI_MODE_0;
at25->spi->bits_per_word = 8;
at25->cdev.ops = &at25_fops;
at25->cdev.size = chip->size;
at25->cdev.size = at25->chip.size;
at25->cdev.dev = dev;
at25->cdev.name = at25->chip.name[0] ? at25->chip.name : DRIVERNAME;
at25->cdev.priv = at25;
@ -299,8 +364,17 @@ fail:
return err;
}
static __maybe_unused struct of_device_id at25_dt_ids[] = {
{
.compatible = "atmel,at25",
}, {
/* sentinel */
}
};
static struct driver_d at25_driver = {
.name = DRIVERNAME,
.of_compatible = DRV_OF_COMPAT(at25_dt_ids),
.probe = at25_probe,
};
device_spi_driver(at25_driver);