Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 002176db authored by Alexandre Pereira da Silva's avatar Alexandre Pereira da Silva Committed by Greg Kroah-Hartman
Browse files

misc: at25: Parse dt settings 



This adds dt support to the at25 eeprom driver.

Signed-off-by: default avatarAlexandre Pereira da Silva <aletes.xgr@gmail.com>
Tested-by: default avatarRoland Stigge <stigge@antcom.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 98dcd59d

Documentation/devicetree/bindings/misc/at25.txt

0 → 100644
+21 −0
Original line number Diff line number Diff line 
Atmel AT25 eeprom



Required properties:

- compatible : "atmel,at25".

- reg : chip select number

- spi-max-frequency : max spi frequency to use



- at25,byte-len : total eeprom size in bytes

- at25,addr-mode : addr-mode flags, as defined in include/linux/spi/eeprom.h

- at25,page-size : size of the eeprom page



Examples:

at25@0 {

	compatible = "atmel,at25";

	reg = <0>

	spi-max-frequency = <5000000>;



	at25,byte-len = <0x8000>;

	at25,addr-mode = <2>;

	at25,page-size = <64>;

};

drivers/misc/eeprom/at25.c

+45 −16
Original line number Diff line number Diff line
@@ -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) {

	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: