i2c: sync i2c_parse_fw_timings() with upstream ...

Upstream now has support for i2c-digital-filter-width-ns and
i2c-analog-filter-cutoff-frequency device tree properties, that are
used in an upcoming patch.
Prepare for it by syncing with Linux v5.8-rc4.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i2c: Port of_find_i2c_device_by_node() from Linux ...

Port of_find_i2c_device_by_node() from Linux in order to allow looking
i2c_client up by corresponding DT node. Useful for interacting with
identical raw/driverless I2C devices that are not found on the same
bus between board variants.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i2c: port Linux i2c_parse_fw_timings ...

Linux has a generic function for extracting i2c timings parameters from
device-associated firmware nodes. Port this function to barebox, but
have it only work on device tree nodes for now.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers: Introduce dev_set_name() ...

Introduce dev_set_name() in order to hide implementation details of
setting device's name so it'd be easier to change it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i2c: i2c_master_send(): don't leave flags uninitialized ...

Leaving the flags field unitialized can lead to performing
read operation instead of write operation.

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

i2c: read/write_reg: don't assume client->dev to be valid ...

When using the barebox commands i2c_read or i2c_write the client pointer
passed to the respective function isn't completely initialized. This
makes

	dev_dbg(&client->dev, ...);

choke as it dereferences client->dev.driver->name with
client->dev.driver being a random value.

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

i2c: core: Add client I2C address to devinfo ...

Useful bit of information.  Example:
barebox:/ devinfo dummy0
Bus: i2c
  Address: 0x52

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

i2c: Create for_each_i2c_adapter() ...

This can be used by the i2c_probe command to iterate over i2c adapters.

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

i2c: add bus recovery infrastructure ...

This is based on the code introduced to the kernel in
5f9296b.

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

i2c: only register enabled child nodes ...

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

i2c: Use correct format specifier ...

'count' is of type u16, not size_t.

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

driver: Call remove function only when available ...

The bus implementations currently call the drivers remove
hook unconditionally, but this hook is seldomly populated. Only call
it when it's actually populated.

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

i2c: implement of_find_i2c_adapter_by_node ...

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

Merge branch 'for-next/modalias'

drivers/i2c/i2c.c: Fix sparse warnings ...

drivers/i2c/i2c.c:246:19: warning: symbol 'i2c_new_device' was not declared. Should it be static?
drivers/i2c/i2c.c:274:6: warning: symbol 'of_i2c_register_devices' was not declared. Should it be static?

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

i2c/spi: match of_modaliases ...

i2c/spi devices in the devicetree often come with a "vendor,device"
comaptible string. These do not match in barebox, so add a
device_match_of_modalias function which does exactly that.

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

treewide: Add missing includes ...

A lot of files rely on include/driver.h including include/of.h (and
this including include/errno.h. include the files explicitly so we can
eventually get rid of including of.h from driver.h

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

i2c: Reuse "driver_match" for I2C bus ...

This will allow to use device_ids and make code a bit smaller.

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

OF: base: convert and remove device_node_for_nach_child ...

Remove device_node_for_nach_child and convert users to corresponding
imported OF API functions.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i2c: Add devicetree support ...

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

i2c: Add support for dynamic i2c bus numbers ...

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

i2c: remove dead code ...

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

i2c: Add missing result check ...

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

drivers/base: fix corrupt device tree ...

dev_add_child is a very unsafe function. If called multiple times
it allows setting the same device to different parents thus corrupting
the siblings list. This happens regularly since:

| commit c2e568d
| Author: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
| Date:   Sat Nov 3 16:11:05 2012 +0100
|
|    bus: add bus device
|
|    automatically add it as parent of any bus device if none already specified
|
|    we have now a nice output per bus

If for example a FATfs is mounted this nice output per bus often ends with:

>     `---- fat0
>     `---- 0
>          `---- 0x86f0000087020031-0x86f000410df27124: /dev/<NULL>
>          `---- sram00
>               `---- 0x00000000-0xffffffffffffffff: /dev/<NULL>
>               `---- 0x00000000-0xffffffffffffffff: /dev/<NULL>
>               unable to handle NULL pointer dereference at address 0x0000000c
> pc : [<87f08a20>]    lr : [<87f08a04>]
> sp : 86eff8c0  ip : 87f3fbde  fp : ffffffff
> r10: ffffffff  r9 : 00000000  r8 : 00000003
> r7 : 86f075b8  r6 : 00000002  r5 : ffffffec  r4 : 86f07544
> r3 : 00000000  r2 : 43f900b4  r1 : 00000020  r0 : 00000005
> Flags: Nzcv  IRQs off  FIQs off  Mode SVC_32
> [<87f08a20>] (do_devinfo_subtree+0x90/0x130) from [<87f08a90>] (do_devinfo_subtree+0x100/0x130)
>
> [<87f3e070>] (unwind_backtrace+0x0/0x90) from [<87f28514>] (panic+0x28/0x3c)
> [<87f28514>] (panic+0x28/0x3c) from [<87f3e4b8>] (do_exception+0x10/0x14)
> [<87f3e4b8>] (do_exception+0x10/0x14) from [<87f3e544>] (do_data_abort+0x2c/0x38)
> [<87f3e544>] (do_data_abort+0x2c/0x38) from [<87f3e268>] (data_abort+0x48/0x60)

This patch fixes this by adding a device to its parents children list in
register_device so that dev_add_child is no longer needed. This function
is removed from the tree. Now callers of register_device have to clearly
set the parent *before* registering a device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reported-by: Jan Lübbe <jlu@pengutronix.de>

i2c: Add missing DEVICE_ID_DYNAMIC ...

Otherwise it's not possible to register multiple identical devices.

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

i2c: add id_table support ...

this will be use by at24 driver

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

i2c: introduce i2c_new_dummy ...

This returns an I2C client bound to the "dummy" driver, intended for use
with devices that consume multiple addresses.  Examples of such chips
include various EEPROMS (like 24c04 and 24c08 models).

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

i2c: adapter: register it's own device ...

so we can show the this of i2c busses
set the bus device as parent of all devices.

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

driver: register bus ...

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

I2C: Put I2C devices on their own bus ...

This patch adds a I2C bus on which the I2C devices and drivers register.
This makes it cleaner as I2C devices won't accidently end up probed by
a platform_device driver.

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