Commit graph

652 commits

Author SHA1 Message Date
Tom Rini
328fdeb9c9 Merge tag 'u-boot-rockchip-20230421' of https://source.denx.de/u-boot/custodians/u-boot-rockchip
- Add rk3588 evb support;
- Update pinctrl for rk3568 and rk3588;
- Update rk3288 dts;
- Update mmc support for rk3568 and rk3588;
- Add rng support for rk3588;
- Add DSI support for rk3568;
- Some other misc fixes in dts, config, driver;
2023-04-23 12:15:56 -04:00
Tom Rini
802132c48a Merge https://source.denx.de/u-boot/custodians/u-boot-riscv
* Add StarFive VisionFive v2 Board support
* Support CONFIG_REMAKE_ELF
* Code cleanups for RISC-V architecture
2023-04-22 18:31:46 -04:00
Jonas Karlman
518fa3441e pinctrl: rockchip: Fix IO mux selection on RK3568
IO mux selection is not working correctly for all pins. Sync mux route
data from linux to add any missing and update wrong trigger pins to fix
this. Also apply the pull-up fix needed for GPIO0 D3-D6.

Fixes: 1977d746aa ("rockchip: rk3568: add rk3568 pinctrl driver")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
2023-04-21 15:16:01 +08:00
Jianqun Xu
4f51064533 pinctrl: rockchip: support rk3588 pinctrl
Add support for Rockchip rk3588 variant of pinctrl.

The driver is adapted from the Linux driver.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
[eugen.hristev@collabora.com:
port to latest U-boot, bring more changes from Linux
use translated pull values table]
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
2023-04-21 15:16:00 +08:00
Kuan Lim Lee
732f01aabf pinctrl: starfive: Add StarFive JH7110 driver
Add pinctrl driver for StarFive JH7110 SoC.

Signed-off-by: Kuan Lim Lee <kuanlim.lee@linux.starfivetech.com>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Jianlong Huang <jianlong.huang@starfivetech.com>
Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
2023-04-20 16:08:44 +08:00
Patrice Chotard
bff0d846c7 pinctrl: pinctrl_stm32: Add slew rate support for stm32_pinctrl_get_pin_muxing()
For debug purpose, it should be useful to indicate the slew rate for
each pins.
Add ospeed register information for pins which are configured in
either alternate function or gpio output.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2023-04-19 09:50:32 +02:00
Hai Pham
de4c777e3e pinctrl: renesas: Add R8A779G0 V4H PFC tables
Add pinctrl tables for R8A779G0 V4H SoC.

Based on Linux next 20230228 PFC tables tables up to
commit 058f4df42121 ("Add linux-next specific files for 20230228")

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: LUU HOAI <hoai.luu.ub@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Phong Hoang <phong.hoang.wz@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Sync with Linux next 20230228, sort sh_pfc_pinconf_set voltage args]
2023-04-07 17:13:28 +02:00
LUU HOAI
1b1834c037 pinctrl: renesas: Add R8A779F0 S4 PFC tables
Add pinctrl tables for R8A779F0 S4 SoC.

Based on Linux next 20230228 PFC tables tables up to
commit 058f4df42121 ("Add linux-next specific files for 20230228")

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: LUU HOAI <hoai.luu.ub@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Use RCAR_64 Kconfig, sync with Linux next 20230228]
2023-04-07 17:13:28 +02:00
Quanyang Wang
d0bb00adcc pinctrl: fix pinctrl_gpio_get_pinctrl_and_offset for gpio-ranges array
Sometimes a multi-element array is used for "gpio-ranges" property in
dts file:

    qe_pio_e: gpio-controller@1460 {
        ......
        gpio-ranges = <&pinctrl1 0 20 10>, <&pinctrl2 10 50 20>;
        ......
    };

But the function pinctrl_gpio_get_pinctrl_and_offset can't handle this
case because the "index" argument passed to dev_read_phandle_with_args
is fixed to be "0". Use a loop to traverse the array to fix it.

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
2023-04-03 06:53:53 +12:00
Marek Vasut
ce46817215 pinctrl: renesas: Drop non-existent PFC info table entries
Remove PFC info table entries which are never instantiated,
since there are no drivers for those. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-03-10 17:46:09 +01:00
Robert Marko
1de76a4535 arm64: a37xx: pinctrl: probe after binding
Currently, pinctrl drivers are getting probed during post-bind, however
that is being reverted, and on A37XX pinctrl driver is the one that
registers the GPIO driver during the probe.

So, if the pinctrl driver doesn't get probed GPIO-s won't get registered
and thus they cannot be used.

This is a problem on the Methode eDPU as it just uses SB pins as GPIO-s
and without them being registered networking won't work as it only has
one SFP slot and the TX disable GPIO is on the SB controller.

So, lets just add a flag only to A37XX driver to probe after binding
in order for the GPIO driver to always get registered.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Simon Glass <sjg@chromium.org>
2023-03-01 11:22:27 -07:00
Jagan Teki
1977d746aa rockchip: rk3568: add rk3568 pinctrl driver
Add driver supporting pin multiplexing on rk3568 platform.

Co-developed-by: Manoj Sai <abbaraju.manojsai@amarulasolutions.com>
Signed-off-by: Manoj Sai <abbaraju.manojsai@amarulasolutions.com>
Co-developed-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2023-02-28 18:07:27 +08:00
Simon Glass
42a13b21dc Correct SPL use of ATMEL_PIO4
This converts 1 usage of this option to the non-SPL form, since there is
no SPL_ATMEL_PIO4 defined in Kconfig

Reviewed-by: Eugen Hristev <eugen.hristev@collabora.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
2023-02-10 08:22:52 -05:00
Simon Glass
68be8d95de Correct SPL uses of OF_BOARD
This converts 3 usages of this option to the non-SPL form, since there is
no SPL_OF_BOARD defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
2023-02-10 07:41:41 -05:00
Simon Glass
ef746bfd2c Correct SPL use of SANDBOX
This converts 1 usage of this option to the non-SPL form, since there is
no SPL_SANDBOX defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
2023-02-10 07:41:40 -05:00
Hai Pham
eaa4a7d411 pinctrl: renesas: r8a7796: Add R8A77961 PFC support
R-Car M3-W+ (R8A77961) is pin compatible with R-Car M3-W (R8A77960),
which allows for both SoCs to share a driver.

Based on Linux commit 708c69e9eacc ("pinctrl: sh-pfc: r8a7796: Add
R8A77961 PFC support") and 74ce7a8044b0 ("pinctrl: renesas: r8a7796:
Optimize pinctrl image size for R8A774A1")

Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
2023-02-02 01:49:20 +01:00
Marek Vasut
8a9e8ba9ae pinctrl: renesas: Synchronize R8A779A0 V3U PFC tables with Linux 6.1.7
Synchronize R-Car R8A779A0 V3U PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
37fb54b6e6 pinctrl: renesas: Synchronize R8A77995 D3 PFC tables with Linux 6.1.7
Synchronize R-Car R8A77995 D3 PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
a22eba36a9 pinctrl: renesas: Synchronize R8A77990 E3 PFC tables with Linux 6.1.7
Synchronize R-Car R8A77990 E3 PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
3bf4933555 pinctrl: renesas: Synchronize R8A77980 V3H PFC tables with Linux 6.1.7
Synchronize R-Car R8A77980 V3H PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
84d7588cc6 pinctrl: renesas: Synchronize R8A77970 V3M PFC tables with Linux 6.1.7
Synchronize R-Car R8A77970 V3M PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
50970e8c2d pinctrl: renesas: Synchronize R8A77965 M3-N PFC tables with Linux 6.1.7
Synchronize R-Car R8A77965 M3-N PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
0a57a382af pinctrl: renesas: Synchronize R8A77960 M3-W and R8A77961 M3-W+ PFC tables with Linux 6.1.7
Synchronize R-Car R8A77960 M3-W and R8A77961 M3-W+ PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Note that the Kconfig option name has been updated to match the
Linux kernel Kconfig option name, from PINCTRL_PFC_R8A7796 to
PINCTRL_PFC_R8A77960 .

Also note that a new Kconfig option has been added to enable support
for R8A77961 M3-W+ , the Kconfig option name is PINCTRL_PFC_R8A77961 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
9916e8bfc6 pinctrl: renesas: Synchronize R8A7795 H3 PFC tables with Linux 6.1.7
Synchronize R-Car R8A7795 H3 PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Note that the Kconfig option name has been updated to match the
Linux kernel Kconfig option name, from PINCTRL_PFC_R8A7795 to
PINCTRL_PFC_R8A77951 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
f46776cce0 pinctrl: renesas: Synchronize R8A7794 E2 PFC tables with Linux 6.1.7
Synchronize R-Car R8A7794 E2 PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
f36c55fc6d pinctrl: renesas: Synchronize R8A7792 V2H PFC tables with Linux 6.1.7
Synchronize R-Car R8A7792 V2H PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
9a955714a1 pinctrl: renesas: Synchronize R8A7791 M2-W and R8A7793 M2-N PFC tables with Linux 6.1.7
Synchronize R-Car R8A7791 M2-W and R8A7793 M2-N PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
f8ea2a6779 pinctrl: renesas: Synchronize R8A7790 H2 PFC tables with Linux 6.1.7
Synchronize R-Car R8A7790 H2 PFC tables with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Marek Vasut
3e81242160 pinctrl: renesas: Synchronize PFC core with Linux 6.1.7
Synchronize R-Car PFC core with Linux 6.1.7,
commit 21e996306a6afaae88295858de0ffb8955173a15 .

Parts picked from
pinctrl: renesas: Synchronize R-Car Gen2/Gen3 tables with Linux 5.18.3
- Add pin groups for the green and high8 subsets of the Video IN pins
- Add MediaLB pins
- Add bias support for various SoCs
- Share more pin group data, to reduce size and ease review
- Miscellaneous cleanups, fixes and improvements.

This contains port of Linux kernel commit
6210905586ae ("pinctrl: renesas: Add shorthand for reserved register fields")
to handle negative entries in GROUP() macros correctly.

Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-02-02 01:49:20 +01:00
Michael Walle
e71505fc98 pinctrl: fix docstring
Fix the copy and paste error.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
2023-01-27 12:51:26 -05:00
Michael Walle
75013fa724 pinctrl: get rid of some ifdeffery
Don't define an empty version for pinconfig_post_bind(). Just guard the
call and let the linker garbage collection do the rest. This way, we
also don't have to do any guesswork.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Marek Vasut <marex@denx.de>
2023-01-27 12:51:26 -05:00
Michael Walle
72b8c6d1eb pinctrl: don't fall back to pinctrl_select_state_simple()
If CONFIG_PINCTRL_FULL is enabled, never fall back to the simple
implementation. pinctrl_select_state() is called for each device and it
is expected to fail. A fallback to the simple imeplementation doesn't
make much sense.

To keep the return code consistent, we need to change the -EINVAL (which
was ignored before) to -ENOSYS.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2023-01-27 12:51:26 -05:00
Tom Rini
6e7df1d151 global: Finish CONFIG -> CFG migration
At this point, the remaining places where we have a symbol that is
defined as CONFIG_... are in fairly odd locations. While as much dead
code has been removed as possible, some of these locations are simply
less obvious at first. In other cases, this code is used, but was
defined in such a way as to have been missed by earlier checks.  Perform
a rename of all such remaining symbols to be CFG_... rather than
CONFIG_...

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2023-01-20 12:27:24 -05:00
Simon Glass
85d87112cb dm: pinctrl: Revert "pinctrl: probe pinctrl drivers during post-bind"
This breaks chromebook_coral and it is also not how things should work. If
a board needs to bind GPIOs as part of a pinctrl driver this can be done
during the bind step, if needed.

We cannot probe pinctrl devices when binding as a rule, since it cannot be
supported on some platforms.

The bind and probe steps are separate in U-Boot and they should remain
separate.

This reverts commit f9ec791b5e.

Signed-off-by: Simon Glass <sjg@chromium.org>
2023-01-18 11:49:13 -07:00
Jagan Teki
8430a87502 pinctrl: rockchip: Add rv1126 support
Add pinctrl driver for Rockchip RV1126.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2023-01-16 18:01:11 +08:00
Jagan Teki
32b2ea9818 pinctrl: rockchip: Add pinctrl route types
Some pins in rockchip are routed via Top GRF and PMU GRF
instead of direct regmap.

Add support to handle all these routing paths so that the
SoC pinctrl drivers will use them accordingly.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2023-01-16 18:01:11 +08:00
Jim Liu
7ee1c4d1d1 pinctrl: nuvoton: add NPCM7xx/NPCM8xx reset type detect
add reset type detect and persist setting.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
2023-01-10 15:39:06 -05:00
Dai Okamura
ef75d482aa pinctrl: uniphier: add ethernet TX pin data for PXs3
PXs3 Ref boards need to change the strength of ethernet ports
for stability, like LD20's one.

This adds the table data and fixes the boot issue on PXs3 Ref board.

Fixes: 0852033309 ("ARM: uniphier: sync with Linux 5.8-rc4")
Signed-off-by: Dai Okamura <okamura.dai@socionext.com>
2023-01-02 14:10:23 -05:00
Dai Okamura
1e91a0ea32 pinctrl: uniphier: add check if pins are valid
The pinctrl datas of uniphier SoCs are the minimal subsets of kernel's one,
and some tables has no data to save the footprint size.
If the board dts tries to match a pin name on no pins defined SoC,
the footprint magic code causes "Synchronous Abort".

This checks if the 'pins' data is valid,
and if empty, avoids the abort with the warning as follows:

  WARNING at drivers/pinctrl/uniphier/pinctrl-uniphier-core.c:36/uniphier_pinctrl_get_pins_count()!
  pinctrl_select_state_full: pinctrl_config_one: err=-38

Signed-off-by: Dai Okamura <okamura.dai@socionext.com>
2023-01-02 14:10:23 -05:00
Samuel Holland
6cad8bea4f pinctrl: sunxi: Add P2WI and RSB pinmuxes
P2WI and RSB are used to communicate with a PMIC. Most SoCs have only
one possible pinmux. F1C100s has two possibilities, with different mux
values, so omit it until some board needs one of them.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
2022-12-13 20:33:37 +00:00
Michal Simek
716527299a Revert "pinctrl: zynqmp: Add support for output-enable and bias-high-impedance"
This reverts commit 123462e5e5.

On systems with older PMUFW using these pinctrl properties can cause system
hang because there is missing feature autodetection.
When it is implemented support for these two properties should go back.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/c2900319ea80484f21692997f296269aee701c1f.1665659138.git.michal.simek@amd.com
2022-11-22 15:02:07 +01:00
Chris Packham
c249938214 pinctrl: mvebu: Add AlleyCat5 support
This uses the same IP block as the Armada-8K SoCs.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
2022-11-07 07:46:28 +01:00
Jim Liu
1c1036499f pinctrl: nuvoton: Add NPCM8xx pinctrl driver
Add Nuvoton BMC NPCM845 Pinmux and Pinconf support.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
Signed-off-by: Stanley Chu <yschu@nuvoton.com>
2022-11-02 13:31:40 -04:00
Andre Przywara
843ed983a0 suniv: add UART1 support
Some boards with the Allwinner F1C100s family SoCs use UART1 for its
debug UART, so define the pins for the SPL and the pinmux name and mux
value for U-Boot proper.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
2022-10-19 14:15:02 +01:00
John Keeping
7eda1a9533 pinctrl: fix buffer size for pinctrl_generic_set_state_prefix()
This buffer has the concatenated prefix and name written into it, so it
must be large enough to cover both strings plus the terminating NUL.

Fixes: 92c4a95ec7 ("pinctrl: Add new function pinctrl_generic_set_state_prefix()")
Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-10-11 15:40:48 -04:00
Jim Liu
45455e8ff5 pinctrl: nuvoton: fix set persist error
CA9C is cortex A9 watchdog reset control bit.
if device set persist mode, it shouldn't set this bit.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
2022-10-11 15:40:48 -04:00
Weijie Gao
59acdf8afe pinctrl: mediatek: add pinctrl driver for MT7986 SoC
This patch adds pinctrl and gpio support for MT7986 SoC

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
ace67d1097 pinctrl: mediatek: add pinctrl driver for MT7981 SoC
This patch adds pinctrl and gpio support for MT7981 SoC

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Sergiu Moga
7086defa04 pinctrl: at91-pio4: Add support for pinctrl config subnodes
Previously, in order for the `pinctrl-*` DT node properties
to be properly processed, the pinctrl's subnodes were limited
to only having the `pinmux` property as well as other additional
properties (slew-rate, bias-disable, etc.). Now, with this patch
the pinctrl driver is made to work similarly to the one from Linux.
It can now distinguish between one subnode and a subnode with multiple
subnodes.

Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
2022-09-19 09:51:04 +03:00
Sergiu Moga
2ed96a87d2 pinctrl: at91-pio4: Bind GPIO driver to the pinctrl DT node
This has been done in order to align the DT of U-Boot with the DT
of Linux. In Linux, a phandle from a '-gpio' DT property is linked
to the pinctrl driver, a single driver that handles both pinctrl
settings and offers GPIO API to callers. On the other hand,
U-Boot redirects such phandle to a corresponding UCLASS_GPIO
driver, because U-Boot offers two different types of drivers
in this case: UCLASS_PINCTRL which handles pin functions and
UCLASS_GPIO which handles gpio requests as a gpio provider.
Due to this, we have two drivers in Uboot, but the Devicetree
has a single node. Thus, just one of the drivers can be probed
for the DT node during platform initialization, before relocation.

Our previous solution in U-Boot was to have a different devicetree:
the gpio node has a subnode for the pinctrl driver, which
is not compliant with Linux ABI. Furthermore, our documentation
for this type of nodes mentions no such gpio compatible.

After this patch, we can no longer add nodes with a gpio
compatible in the DT. Thus, in order to link the pinctrl driver to
the gpio one, a hook to the bind method of the former in U-Boot has
been added and the GPIO related compatibles have been removed to
avoid conflict when compatibles are enumerated and bound to drivers
during platform start before relocation. The bind method will attach
the GPIO driver to the pinctrl DT node so that every phandle coming
from '-gpio' DT properties will be redirected to a valid driver
attached to the pinctrl DT node.

Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
2022-09-19 09:51:04 +03:00