Commit graph

651 commits

Author SHA1 Message Date
Tom Rini
9ff4ce8abc nman external-symbol improvements
Driver model memory-usage reporting
 patman test-reporting improvements
 Add bloblist design goals
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Merge tag 'dm-pull-28jun22' of https://source.denx.de/u-boot/custodians/u-boot-dm into next

nman external-symbol improvements
Driver model memory-usage reporting
patman test-reporting improvements
Add bloblist design goals
2022-07-08 14:39:07 -04:00
Tom Rini
a457ebd786 arm: Remove PXA architecture support
With the last platform for this architecture removed, remove the rest of
the architecture support as well.

Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-07-07 09:29:08 -04:00
Simon Glass
2cb4ddb91e dm: core: Add a command to show driver model statistics
This command shows the memory used by driver model along with various
hints as to what it might be if some 'core' tags were moved to use the
tag list instead of a core (i.e. always-there) pointer.

This may help with future work to reduce memory usage.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-06-28 03:09:52 +01:00
Simon Glass
0dfda34ca5 dm: core: Add a way to collect memory usage
Add a function for collecting the amount of memory used by driver model,
including devices, uclasses and attached data and tags.

This information can provide insights into how to reduce the memory
required by driver model. Future work may look at execution speed also.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-06-28 03:09:52 +01:00
Simon Glass
930a3ddade dm: core: Support accessing core tags
At present tag numbers are only allocated for non-core data, meaning that
the 'core' data, like priv and plat, are accessed through dedicated
functions.

For debugging and consistency it is convenient to use tags for this 'core'
data too. Add support for this, with new tag numbers and functions to
access the pointer and size for each.

Update one of the test drivers so that the uclass-private data can be
tested here.

There is some code duplication with functions like device_alloc_priv() but
this is not addressed for now. At some point, some rationalisation may
help to reduce code size, but more thought it needed on that.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-06-28 03:09:52 +01:00
Simon Glass
53c20bebb2 dm: core: Switch the testbus driver to use a new struct
At present this driver uses 'priv' struct to hold 'plat' data, which is
confusing. The contents of the strct don't matter, since only dtoc is
using it. Create a new struct with the correct name.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-06-28 03:09:52 +01:00
Simon Glass
1452870404 dm: core: Rename dm_dump_all()
This is not a good name anymore as it does not dump everything. Rename it
to dm_dump_tree() to avoid confusion.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-06-28 03:09:52 +01:00
Sean Anderson
8b52f237f0 dm: core: Provide fallbacks for ofnode_conf_read_...
Because fdt_get_config_str et al. were moved/renamed to
ofnode_conf_read_str, they now depend on CONFIG_DM as well as
CONFIG_OF_CONTROL. Add some fallback implementations, preventing a
linker error when CONFIG_SPL_OF_CONTROL and CONFIG_SPL_ENV_IS_IN_MMC are
enabled and CONFIG_SPL_DM is disabled.

Fixes: 7de8bd03c3 ("treewide: fdt: Move fdt_get_config_... to ofnode_conf_read...")
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
2022-06-28 03:09:51 +01:00
Andrew Scull
3f807c6b81 fuzzing_engine: Add fuzzing engine uclass
This new class of device will provide fuzzing inputs from a fuzzing
engine.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-06-23 12:58:18 -04:00
Tom Rini
3135ba642f arm: pxa: Remove CONFIG_CPU_PXA25X
There are no platforms that set this, remove the code.

Signed-off-by: Tom Rini <trini@konsulko.com>
2022-06-06 12:09:12 -04:00
Marek Vasut
9cc32bfa49 dm: core: Add DM_FLAG_PROBE_AFTER_BIND flag
Introduce DM_FLAG_PROBE_AFTER_BIND flag, which can be set by driver or
uclass in .bind(), to indicate such driver instance should be probe()d
once binding of all devices is complete.

This is useful in case the driver determines that hardware initialization
is mandatory on boot, and such initialization happens only in probe().
This also solves the inability to call device_probe() from .bind().

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Steven Lawrance <steven.lawrance@softathome.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Tested-by: Patrice Chotard <patrice.chotard@foss.st.com>
2022-04-28 09:26:43 -04:00
Tom Rini
8cfac237b9 Merge branch '2022-04-25-initial-implementation-of-stdboot'
To quote the author:
The bootflow feature provide a built-in way for U-Boot to automatically
boot an Operating System without custom scripting and other customisation.
This is called 'standard boot' since it provides a standard way for
U-Boot to boot a distro, without scripting.

It introduces the following concepts:

   - bootdev - a device which can hold a distro
   - bootmeth - a method to scan a bootdev to find bootflows (owned by
                U-Boot)
   - bootflow - a description of how to boot (owned by the distro)

This series provides an implementation of these, enabled to scan for
bootflows from MMC, USB and Ethernet. It supports the existing distro
boot as well as the EFI loader flow (bootefi/bootmgr). It works
similiarly to the existing script-based approach, but is native to
U-Boot.

With this we can boot on a Raspberry Pi 3 with just one command:

   bootflow scan -lb

which means to scan, listing (-l) each bootflow and trying to boot each
one (-b). The final patch shows this.

With a standard way to identify boot devices, booting become easier. It
also should be possible to support U-Boot scripts, for backwards
compatibility only.

...

The design is described in these two documents:

https://drive.google.com/file/d/1ggW0KJpUOR__vBkj3l61L2dav4ZkNC12/view?usp=sharing

https://drive.google.com/file/d/1kTrflO9vvGlKp-ZH_jlgb9TY3WYG6FF9/view?usp=sharing
2022-04-25 16:02:27 -04:00
Simon Glass
a950d31abe bootstd: Add the bootmeth uclass and helpers
A bootmeth is a method of locating an operating system. For now, just
add the uclass itself. Drivers for particular bootmeths are added later.

If no bootmeths devices are included in the devicetree, create them
automatically. This avoids the need for boilerplate in the devicetree
files.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-25 10:00:04 -04:00
Simon Glass
201417d700 bootstd: Add the bootdev uclass
A 'bootdev' is a device which can be used to boot an operating system.
It is a child of the media device (e.g. MMC) which handles reading files
from that device, such as a bootflow file.

Add a uclass for bootdev and the various helpers needed to make it
work. Also add a binding file, empty for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-25 10:00:04 -04:00
Simon Glass
ef5e3891f5 bootstd: Add the bootstd uclass and core implementation
The 'bootstd' device provides the central information about U-Boot
standard boot.

Add a uclass for bootstd and the various helpers needed to make it
work. Also add a binding file.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-25 10:00:04 -04:00
Simon Glass
4e0710a2d0 dm: core: Allow finding a uclass device by partial name
In some cases two devices are related and the only way to tell is to
check that the names partially patch. Add a way to check this without
needing to create a new string for the comparison.

Fix the comment for device_find_child_by_namelen() while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-25 10:00:03 -04:00
Simon Glass
6aa4fe3912 dm: core: Rename and fix uclass_get_by_name_len()
It seems that namelen is more common in U-Boot. Rename this function to
fit in better. Also fix a bug where it breaks the operation of
uclass_get_by_name() and add a test.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reported-by: Tim Harvey <tharvey@gateworks.com>
2022-04-25 10:00:03 -04:00
AKASHI Takahiro
43855fdb2c dm: disk: add UCLASS_PARTITION
NOTE: probably we have to update config dependencies,
in particular, SPL/TPL_PRINTF?

With this new function, UCLASS_PARTITION devices will be created as
child nodes of UCLASS_BLK device.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2022-04-23 22:05:41 +02:00
Simon Glass
cdd73e7215 dm: core: Deal with a wrinkle with linker lists
When every member of a linker list is aligned by the compiler, we can no
longer rely on the sizeof of the struct to determine the number of
entries.

For example, if the struct size is 0x90 but every entry is aligned to 0xa0
by the compiler, the linker list entries takes more space in memory and
the calculation of the number of entries is incorrect. For example, we may
see 0x12 entries when there are only 0x11.

This is a real problem. There may be a general solution, although I cannot
currently think of one. So far it only bites with OF_PLATDATA_RT which
creates a pointer to each entry of the 'struct udevice' linker_list. This
does not happen without that option, so it only affects SPL.

Work around it by manually calculating the aligned size of struct udevice,
then using that for the n_ent calculation.

Note: the alignment fix to linker list was here:

   0b2fa98aa5 linker_lists: Fix alignment issue

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-18 17:53:56 -04:00
Simon Glass
092d5c2a83 dm: core: Allow devres to be disabled in SPL
At present if devres is enabled in U-Boot proper it is enabled in SPL.
We don't normally want it there, so disable it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Angus Ainslie <angus@akkea.ca>
2022-04-18 17:53:56 -04:00
Tom Rini
7f418ea598 Merge branch 'next' of https://source.denx.de/u-boot/custodians/u-boot-net
- DM9000 DM support
- tftp server bug fix
- mdio ofnode support functions
- Various phy fixes and improvements.

[trini: Fixup merge conflicts in drivers/net/phy/ethernet_id.c
drivers/net/phy/phy.c include/phy.h]
2022-04-15 08:10:32 -04:00
Marek Behún
ffb0f6f488 treewide: Rename PHY_INTERFACE_MODE_NONE to PHY_INTERFACE_MODE_NA
Rename constant PHY_INTERFACE_MODE_NONE to PHY_INTERFACE_MODE_NA to make
it compatible with Linux' naming.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
2022-04-10 08:44:13 +03:00
Marek Behún
123ca114e0 net: introduce helpers to get PHY interface mode from a device/ofnode
Add helpers ofnode_read_phy_mode() and dev_read_phy_mode() to parse the
"phy-mode" / "phy-connection-type" property. Add corresponding UT test.

Use them treewide.

This allows us to inline the phy_get_interface_by_name() into
ofnode_read_phy_mode(), since the former is not used anymore.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Tested-by: Patrice Chotard <patrice.chotard@foss.st.com>
2022-04-10 08:44:12 +03:00
Marek Behún
f3dd213e15 net: introduce helpers to get PHY ofnode from MAC
Add helpers ofnode_get_phy_node() and dev_get_phy_node() and use it in
net/mdio-uclass.c function dm_eth_connect_phy_handle(). Also add
corresponding UT test.

This is useful because other part's of U-Boot may want to get PHY ofnode
without connecting a PHY.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-04-10 08:44:12 +03:00
AKASHI Takahiro
6b7a6210fd dm: add tag support
With dm-tag feature, any U-Boot subsystem is allowed to associate
arbitrary number of data with a particular udevice. This can been
see as expanding "struct udevice" without modifying the definition.

As a first user, UEFI subsystem makes use of tags to associate
an efi_disk object with a block device.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-04-09 21:06:31 +02:00
Simon Glass
e86b6f7100 dm: core: Tidy up comments in uclass headers
Improve some of the comments in these files, which don't follow the
correct style.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-06 14:03:17 -04:00
Simon Glass
bb36b9a7d6 dm: core: Add a required struct declaration
This file uses struct driver, so declare it at the top in case the
header-inclusion order is not as expected.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-04-06 14:03:17 -04:00
Heinrich Schuchardt
d23f290840 dm: fix function documentation in include/dm/ofnode.h
We use Sphinx style comments to describe functions.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2022-04-06 09:21:49 -04:00
Tom Rini
297e6eb8dc Xilinx changes for v2022.07-rc1
microblaze:
 - Add support for reserved memory
 
 xilinx:
 - Update FRU code with MAC reading
 
 zynqmp:
 - Remove double AMS setting
 - DT updates (mostly for SOMs)
 - Add support for zcu106 rev 1.0
 
 zynq:
 - Update nand binding
 
 nand:
 - Aligned zynq_nand to upstream DT binding
 
 net:
 - Add support for ethernet-phy-id
 
 mmc:
 - Workaround CD in zynq_sdhci driver also for ZynqMP
 - Add support for dynamic/run-time SD config for SOMs
 
 gpio:
 - Add driver for slg7xl45106
 
 firmware:
 - Add support for dynamic SD config
 
 power-domain:
 - Update zynqmp driver with the latest firmware
 
 video:
 - Add skeleton driver for DP and DPDMA
 
 i2c:
 - Fix i2c to work with QEMU
 
 pinctrl:
 - Add driver for zynqmp pinctrl driver
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Merge tag 'xilinx-for-v2022.07-rc1' of https://source.denx.de/u-boot/custodians/u-boot-microblaze into next

Xilinx changes for v2022.07-rc1

microblaze:
- Add support for reserved memory

xilinx:
- Update FRU code with MAC reading

zynqmp:
- Remove double AMS setting
- DT updates (mostly for SOMs)
- Add support for zcu106 rev 1.0

zynq:
- Update nand binding

nand:
- Aligned zynq_nand to upstream DT binding

net:
- Add support for ethernet-phy-id

mmc:
- Workaround CD in zynq_sdhci driver also for ZynqMP
- Add support for dynamic/run-time SD config for SOMs

gpio:
- Add driver for slg7xl45106

firmware:
- Add support for dynamic SD config

power-domain:
- Update zynqmp driver with the latest firmware

video:
- Add skeleton driver for DP and DPDMA

i2c:
- Fix i2c to work with QEMU

pinctrl:
- Add driver for zynqmp pinctrl driver
2022-03-16 12:52:02 -04:00
Ashok Reddy Soma
e19b8dda92 pinctrl: Increase length of pinmux status buffer
Xilinx ZynqMP SOC can set 6 parameters for its pins. pinmux status
command will print the status of these parameters for each pin. But
current print buffer length is only 40 characters long, increase it
to 80 to print all the parameters.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/3a6be84c8354f38754a9838670cc0319e84f29e8.1645626183.git.michal.simek@xilinx.com
2022-03-14 15:23:26 +01:00
Simon Glass
5b896ed585 event: Add events for device probe/remove
Generate events when devices are probed or removed, allowing hooks
to be added for these situations.

This is controlled by the DM_EVENT config option.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-03-10 08:28:36 -05:00
Michal Simek
db681d4929 net: phy: Add new read ethernet phy id function
Add new function to get ethernet phy id from compatible property
of the mdio phy node.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Link: https://lore.kernel.org/r/16019efb3820a50330935fdaae191cec1f101b5c.1645627539.git.michal.simek@xilinx.com
2022-03-09 12:43:16 +01:00
Ashok Reddy Soma
4173a42685 dm: pinctrl: Use explicit values for enums
Based on discussion at
https://lore.kernel.org/r/20200318125003.GA2727094@kroah.com we got
recommendation to use explicit values for all enums.

So, add explicit values to all pinctrl related enums for readability.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/dcdb20e7252ea7465e9f984d815e9624c30e9558.1645624969.git.michal.simek@xilinx.com
2022-03-07 08:49:42 +01:00
Sughosh Ganu
82ee8bfe51 dm: Use parenthesis for the device_get_ops macro argument
Use parenthesis for the device_get_ops macro argument. This prevents
errors when using an expression for the parameter.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-02-09 12:26:12 -07:00
Simon Glass
2d7c738296 acpi: Collect tables in the acpi_item list
At present this list is used to collect items within the DSDT and SSDT
tables. It is useful for it to collect the whole tables as well, so there
is a list of what was created and which write created each one.

Refactor the code accordingly.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Simon Glass
eacb6d0ba2 x86: Move DSDT table to a writer function
Move this table over to use a writer function, moving the code from the
x86 implementation.

Add a pointer to the DSDT in struct acpi_ctx so we can reference it later.

Disable this table for sandbox since we don't actually compile real ASL
code.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Simon Glass
a53d38f80a x86: Move FACS table to a writer function
Move this table over to use a writer function, moving the code from the
x86 implementation.

Add a pointer to the DSDT in struct acpi_ctx so we can reference it later.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Simon Glass
94ba15a3f1 x86: Move base tables to a writer function
Use the new ACPI writer to write the base tables at the start of the area,
moving this code from the x86 implementation.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Simon Glass
cc1f8c3988 x86: acpi: Split out context creation from base tables
At present acpi_setup_base_tables() both sets up the ACPI context and
writes out the base tables.

We want to use an ACPI writer to write the base tables, so split this
function into two, with acpi_setup_ctx() doing the context set, and
acpi_setup_base_tables() just doing the base tables.

Disable the writer's write_acpi_tables() function for now, to avoid
build errors. It is enabled in a following patch.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Simon Glass
6afa63a5a6 acpi: Add a linker list for ACPI tables
At present we call lots of functions to generate the required ACPI tables.
It would be better to standardise these functions and allow them to be
automatically collected and used when needed.

Add a linker list to handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Simon Glass
fb746fdec6 acpi: Add a table start
It is useful to record the start of an ACPI table so that offsets from
that point can be easily calculated.

Add this to the context and set it before calling the writer method.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-01-25 11:44:36 -07:00
Heinrich Schuchardt
185f812c41 doc: replace @return by Return:
Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-19 18:11:34 +01:00
Patrick Delaunay
5ebb52702e doc: add include/dm/fdtaddr.h to the HTML documentation
Correct Sphinx style comments in include/dm/fdtaddr.h
and add the devfdt API to the HTML documentation;
these functions are NOT compatible with live tree.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
be74f71a67 doc: add include/dm/of*.h to the HTML documentation
Correct Sphinx style comments in include/dm/ofnode.h
and add the device tree node API to the HTML documentation;
the ofnode functions are compatible with Live tree or with flat
device tree.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
6de6a615f8 doc: add include/dm/read.h to the HTML documentation
Correct Sphinx style comments in include/dm/read.h
and add the device read from device tree API to the HTML
documentation.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
494bc8e6f0 doc: add include/dm/devres.h to the HTML documentation
Correct Sphinx style comments in include/dm/devres.h
and add the driver model device resource API, devres_*(),
to the HTML documentation.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
9fb1c77ef6 doc: add include/dm/device.h to the HTML documentation
Correct Sphinx style comments in include/dm/device.h
and add the driver model device API to the HTML documentation.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
ca4ca43e2f doc: add include/dm/platdata.h to the HTML documentation
Correct Sphinx style comments in include/dm/platdata.h
and add the associated API to the HTML documentation.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
cbb14ac92c doc: add include/dm/lists.h to the HTML documentation
Correct Sphinx style comments in include/dm/lists.h
and add the list API to the HTML documentation.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00
Patrick Delaunay
0cdd7ded88 doc: add include/dm/root.h to the HTML documentation
Correct Sphinx style comments in include/dm/devres.h
and add the associated driver model API to the HTML documentation.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-15 10:57:21 +01:00