From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] eeprom: at25: Add dt probe support
Date: Thu, 15 May 2014 08:39:49 +0200 [thread overview]
Message-ID: <1400135990-5391-1-git-send-email-s.hauer@pengutronix.de> (raw)
The parsing code has been taken directly from Linux 3.15-rc5.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/eeprom/at25.c | 98 ++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 86 insertions(+), 12 deletions(-)
diff --git a/drivers/eeprom/at25.c b/drivers/eeprom/at25.c
index 0a099e1..266f261 100644
--- a/drivers/eeprom/at25.c
+++ b/drivers/eeprom/at25.c
@@ -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);
--
2.0.0.rc0
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next reply other threads:[~2014-05-15 6:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-15 6:39 Sascha Hauer [this message]
2014-05-15 6:39 ` [PATCH 2/2] mtd: m25p80: update Micron IDs Sascha Hauer
2014-05-15 8:19 ` Holger Schurig
2014-05-15 10:53 ` Sascha Hauer
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