eeprom: at24: add the "read-only" dt parameter support ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: use of_property_read_bool where appropriate ...

Use of_property_read_bool where boolean properties are read.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: partition: Register the of partition fixup for of partition users ...

at24, at25 and mci core are using of_parse_partitions(). Register the
fixup for them aswell.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'

eeprom: at24: Use xasprintf for small allocation ...

The code for error checking shouldn't be bigger than the allocated
string.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: at24: fix discarding const qualifier ...

fixes:
at24.c:434:10: warning: assignment discards 'const' qualifier from pointer
target type

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: at24: make device name setup more robust ...

With two eeproms that have a different compatible string (in my case
"at,24c64" and "at,24c32") dev->id is 0 for both which results in a
failure to bind the device that is probed later.

So pick a name more intelligently: If there is an alias defined in the
device tree, use this one, otherwise pick a free index.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: at24: check return value of devfs_create and fix error path ...

if devfs_create failed because "eeprom0" already exists
of_parse_partitions must not be called, otherwise the already existing
eeprom gets assigned partitions that don't belog there.

Also free dummy clients in the error path and the write protect gpio
only if it is actually valid.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: at25: check return value of devfs_create ...

Also only emit the message that the device was probed when it
actually was.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

string: Fix (v)asprintf prototypes ...

Our asprintf and vasprintf have different prototypes than the glibc
functions. This causes trouble when we want to share barebox code
with userspace code. Change the prototypes for (v)asprintf to match
the glibc prototypes. Since the current (v)asprintf are convenient
to use change the existing functions to b(v)asprintf.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom/at25: parse partitions from device tree ...

Unlike at24 (I2C), the at25 (spi) EEPROM driver doesn't check if the
device tree node contains partition definitions.  This means that one
for example cannot have bootstate partitions on an at25 EEPROM, while it
works on an at24 EEPROM.

This patch adds device tree based partition support to the at25 driver.

Signed-off-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: Support pagesize OF device tree property ...

Allows specifying the page size when the eeproms are in the device
tree.  Same as the Linux kernel device-tree bindings for at24.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: Add support for 24c1025 EEPROM ...

This is the Microchip version of the Atmel 24c1024, which is already
supported.  The key difference between them is that the I2C address
bit used to select between the two banks is bit 2 for the 1025 and not
bit 0 as in the 1024.

Add a flag to describe this difference.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

at24: support write-protect GPIO ...

Signed-off-by: Jan Luebbe <jluebbe@debian.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: use 'const void *' for struct of_device_id.data ...

Since 2011 barebox' of_device_id struct uses unsigned long type for data field:

    struct of_device_id {
            char *compatible;
            unsigned long data;
    };

Almost always struct of_device_id.data field are used as pointer
and need 'unsigned long' casting.

E.g. see 'git grep -A 4 of_device_id drivers/' output:

    drivers/ata/sata-imx.c:static __maybe_unused struct of_device_id imx_sata_dt_ids[] = {
    drivers/ata/sata-imx.c- {
    drivers/ata/sata-imx.c-         .compatible = "fsl,imx6q-ahci",
    drivers/ata/sata-imx.c-         .data = (unsigned long)&data_imx6,
    drivers/ata/sata-imx.c- }, {

Here is of_device_id struct in linux kernel v4.0:

    struct of_device_id {
            char name[32];
            char type[32];
            char compatible[128];
            const void *data;
    };

Changing of_device_id.data type to 'const void *data' will increase
barebox' linux kernel compatibility and decrease number of 'unsigned
long' casts.

Part of the patch was done using the 'coccinelle' tool with the
following semantic patch:

    @rule1@
    identifier dev;
    identifier type;
    identifier func;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type)
    + dev_get_drvdata(dev, (const void **)&type)
    ...>
    }
    @rule2@
    identifier dev;
    identifier type;
    identifier func;
    identifier data;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type->data)
    + dev_get_drvdata(dev, (const void **)&type->data)
    ...>
    }

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fix format specifiers ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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>

remove redundant NULL check on free ...

free() already checks the pointer to be non
NULL. No need to do it again.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: at24: Enable OF partition parsing ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Introduce device_spi_driver() macro and use it for SPI drivers ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

I2C: Rename i2c_register_driver() for using with register_driver_macro() ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

SPI: Rename spi_register_driver() for using with register_driver_macro() ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'kconfig'

Cleanup Kconfig files ...

This patch provides a global cleanup barebox Kconfig files. This includes
replacing spaces to tabs, formatting in accordance format, removing
extraneous lines and spaces. No functional changes.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

at25: use dev_lseek_default as at24 does ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: add at24 support ...

This driver to get read/write support to most I2C EEPROMs,
after you configure the driver to know about each EEPROM on
your target board.  Use these generic chip names, instead of
vendor-specific ones like at24c64 or 24lc02:

   24c00, 24c01, 24c02, spd (readonly 24c02), 24c04, 24c08,
   24c16, 24c32, 24c64, 24c128, 24c256, 24c512, 24c1024

Unless you like data loss puzzles, always be sure that any chip
you configure as a 24c32 (32 kbit) or larger is NOT really a
24c16 (16 kbit) or smaller, and vice versa. Marking the chip
as read-only won't help recover from this. Also, if your chip
has any software write-protect mechanism you may want to review the
code to make sure this driver won't turn it on by accident.

Based on linux 3.6

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

SPI: Put SPI devices on their own bus ...

This patch adds a SPI bus on which the SPI devices and drivers register.
This makes it cleaner as SPI devices won't accidently end up probed by
a platform_device driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

use loff_t for file offsets ...

This is a first step for 64bit file support: Make the file sizes/offsets
64bit.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: add at25 eeprom driver ...

This commit adds support for most spi eeproms, such as the
Atmel at25 models.

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>