diff options
| author | Alexandre Pereira da Silva <aletes.xgr@gmail.com> | 2012-06-14 12:59:23 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-15 00:23:04 (GMT) |
| commit | 002176db8113c92d0bda02a47e3d2a4b8f9f55ea (patch) | |
| tree | 62e5aabaa54c7fe486363873fd85cfe2487a9963 /drivers/misc/eeprom/at25.c | |
| parent | 98dcd59dd063dd8099d8dbccd84a40e927dc7138 (diff) | |
| download | linux-002176db8113c92d0bda02a47e3d2a4b8f9f55ea.tar.xz | |
misc: at25: Parse dt settings
This adds dt support to the at25 eeprom driver.
Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Tested-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/eeprom/at25.c')
| -rw-r--r-- | drivers/misc/eeprom/at25.c | 61 |
1 files changed, 45 insertions, 16 deletions
diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c index 0842c29..25003d6 100644 --- a/drivers/misc/eeprom/at25.c +++ b/drivers/misc/eeprom/at25.c @@ -19,7 +19,7 @@ #include <linux/spi/spi.h> #include <linux/spi/eeprom.h> - +#include <linux/of.h> /* * NOTE: this is an *EEPROM* driver. The vagaries of product naming @@ -305,25 +305,54 @@ static ssize_t at25_mem_write(struct memory_accessor *mem, const char *buf, static int at25_probe(struct spi_device *spi) { struct at25_data *at25 = NULL; - const struct spi_eeprom *chip; + struct spi_eeprom chip; + struct device_node *np = spi->dev.of_node; int err; int sr; int addrlen; /* Chip description */ - chip = spi->dev.platform_data; - if (!chip) { - dev_dbg(&spi->dev, "no chip description\n"); - err = -ENODEV; - goto fail; - } + if (!spi->dev.platform_data) { + if (np) { + u32 val; + + memset(&chip, 0, sizeof(chip)); + strncpy(chip.name, np->name, 10); + + err = of_property_read_u32(np, "at25,byte-len", &val); + if (err) { + dev_dbg(&spi->dev, "invalid chip dt description\n"); + goto fail; + } + chip.byte_len = val; + + err = of_property_read_u32(np, "at25,addr-mode", &val); + if (err) { + dev_dbg(&spi->dev, "invalid chip dt description\n"); + goto fail; + } + chip.flags = (u16)val; + + err = of_property_read_u32(np, "at25,page-size", &val); + if (err) { + dev_dbg(&spi->dev, "invalid chip dt description\n"); + goto fail; + } + chip.page_size = (u16)val; + } else { + dev_dbg(&spi->dev, "no chip description\n"); + err = -ENODEV; + goto fail; + } + } else + chip = *(struct spi_eeprom *)spi->dev.platform_data; /* For now we only support 8/16/24 bit addressing */ - if (chip->flags & EE_ADDR1) + if (chip.flags & EE_ADDR1) addrlen = 1; - else if (chip->flags & EE_ADDR2) + else if (chip.flags & EE_ADDR2) addrlen = 2; - else if (chip->flags & EE_ADDR3) + else if (chip.flags & EE_ADDR3) addrlen = 3; else { dev_dbg(&spi->dev, "unsupported address type\n"); @@ -348,7 +377,7 @@ static int at25_probe(struct spi_device *spi) } mutex_init(&at25->lock); - at25->chip = *chip; + at25->chip = chip; at25->spi = spi_dev_get(spi); dev_set_drvdata(&spi->dev, at25); at25->addrlen = addrlen; @@ -369,7 +398,7 @@ static int at25_probe(struct spi_device *spi) at25->mem.read = at25_mem_read; at25->bin.size = at25->chip.byte_len; - if (!(chip->flags & EE_READONLY)) { + if (!(chip.flags & EE_READONLY)) { at25->bin.write = at25_bin_write; at25->bin.attr.mode |= S_IWUSR; at25->mem.write = at25_mem_write; @@ -379,8 +408,8 @@ static int at25_probe(struct spi_device *spi) if (err) goto fail; - if (chip->setup) - chip->setup(&at25->mem, chip->context); + if (chip.setup) + chip.setup(&at25->mem, chip.context); dev_info(&spi->dev, "%Zd %s %s eeprom%s, pagesize %u\n", (at25->bin.size < 1024) @@ -388,7 +417,7 @@ static int at25_probe(struct spi_device *spi) : (at25->bin.size / 1024), (at25->bin.size < 1024) ? "Byte" : "KByte", at25->chip.name, - (chip->flags & EE_READONLY) ? " (readonly)" : "", + (chip.flags & EE_READONLY) ? " (readonly)" : "", at25->chip.page_size); return 0; fail: |