dm: Add a No-op uclass

This uclass is intended for devices that do not need any features from the
uclass, including binding children.
This will typically be used by devices that are used to bind chi

dm: Add a No-op uclass

This uclass is intended for devices that do not need any features from the
uclass, including binding children.
This will typically be used by devices that are used to bind child devices
but do not use dm_scan_fdt_dev() to do it. That is for example the case of
several USB wrappers that have 2 child devices (1 for device and 1 for
host) but bind only one at a any given time.

(cherry-picked from 07e33711fec4f1106f36805b5dc830da07c783c5)

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20220207231334.59845-2-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>

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dm: syscon: Don't require a regmap for PCI devices

At present it is not possible to use the syscon devices for PCI devices
since a regmap is required. Since PCI uses a 3-cell address the conversion

dm: syscon: Don't require a regmap for PCI devices

At present it is not possible to use the syscon devices for PCI devices
since a regmap is required. Since PCI uses a 3-cell address the conversion
of the 'reg' property to an address always fails. In any case, the regmap
is not useful with PCI since devices are accessed through the PCI bus
which regmap does not support.

Add a special case for PCI syscon devices, so that they don't set up a
regmap.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

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Merge branch 'master' of git://git.denx.de/u-boot-i2c

- DM I2C improvements

dm: device: fail uclass_find_first_device() if list_empty

While uclass_find_device() fails with -ENODEV in case of list_empty
strangely uclass_find_first_device() returns 0.

Fix uclass_find_first_d

dm: device: fail uclass_find_first_device() if list_empty

While uclass_find_device() fails with -ENODEV in case of list_empty
strangely uclass_find_first_device() returns 0.

Fix uclass_find_first_device() to also fail with -ENODEV instead.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

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dm: core: Introduce dev_read_alias_highest_id()

It is wrapper for calling of_alias_get_highest_id() when live tree is
enabled and fdtdec_get_alias_highest_id() if not.

Signed-off-by: Michal Simek <

dm: core: Introduce dev_read_alias_highest_id()

It is wrapper for calling of_alias_get_highest_id() when live tree is
enabled and fdtdec_get_alias_highest_id() if not.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

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dm: core: Add of_alias_get_highest_id()

The same functionality was added to Linux for i2c bus registration with this
commit message:

"
of: base: add function to get highest id of an alias stem

I2C

dm: core: Add of_alias_get_highest_id()

The same functionality was added to Linux for i2c bus registration with this
commit message:

"
of: base: add function to get highest id of an alias stem

I2C supports adding adapters using either a dynamic or fixed id. The
latter is provided by aliases in the DT case. To prevent id collisions
of those two types, install this function which gives us the highest
fixed id, so we can then let the dynamically created ones come after
this highest number.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
"

Add it also to U-Boot for DM I2C support.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

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