Commit graph

81901 commits

Author SHA1 Message Date
Weijie Gao
6136a23263 cpu: add basic cpu driver for MediaTek ARM chips
Add basic CPU driver used to retrieve CPU model information.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-09-23 15:09:16 -04:00
Weijie Gao
40746bf429 clk: mediatek: add clock driver support for MediaTek MT7981 SoC
This patch adds clock driver support for MediaTek MT7981 SoC

Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:16 -04:00
Weijie Gao
37d5a9a29d clk: mediatek: add clock driver support for MediaTek MT7986 SoC
This patch adds clock driver support for MediaTek MT7986 SoC

Reviewed-by: Sean Anderson <seanga2@gmail.com>
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 15:09:16 -04:00
Weijie Gao
ad832b915a clk: mediatek: add CLK_XTAL support for clock driver
This adds the CLK_XTAL macro/flag to allow modeling clocks which are
directly connected to the xtal clock.

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 15:09:16 -04:00
Weijie Gao
570b0840b1 clk: mediatek: add infrasys clock mux support
This patch adds infrasys clock mux support for mediatek clock drivers.

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 15:09:16 -04:00
Weijie Gao
98a8bbb9ea clk: mediatek: add support to configure clock driver parent
This patch adds support for a clock node to configure its parent clock
where possible.

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 15:09:16 -04:00
Weijie Gao
7fb33e9aea clk: mediatek: add CLK_BYPASS_XTAL flag to allow bypassing searching clock parent of xtal clock
The mtk clock framework in u-boot uses array index for searching clock
parent (kernel uses strings for search), so we need to specify a special
clock with ID=0 for CLK_XTAL in u-boot.

In the mt7622/mt7629 clock tree, the clocks with ID=0 never call
mtk_topckgen_get_mux_rate, adn return xtal clock directly. This what we
expected.

However for newer chips, they may have some clocks with ID=0 not
representing the xtal clock and still needs mtk_topckgen_get_mux_rate be
called. Current logic will make entire clock driver not working.

This patch adds a flag to indicate that whether a clock driver needs clocks
with ID=0 to call mtk_topckgen_get_mux_rate.

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 15:09:16 -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
Weijie Gao
14c81eb2f6 dt-bindings: pinctrl: mediatek: add a header for common pinconf parameters
This patch adds a pinctrl header for common pinconf parameters such as
pull-up/pull-down resistors and drive strengths.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
663e6262c5 arm: dts: mt7622: add i2c support
Add both hardware and software i2c support for mt7622.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
9ad71f6340 i2c: add support for MediaTek I2C interface
This patch adds support for MediaTek I2C interface

Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
b34a2368d6 spi: add support for MediaTek spi-mem controller
This patch adds support for spi-mem controller found on newer MediaTek SoCs
This controller supports Single/Dual/Quad SPI mode.

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: SkyLake.Huang <skylake.huang@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
7daf55d3d1 watchdog: mediatek: add support for MediaTek MT7986 SoC
Add watchdog support for MediaTek 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
980e107d0f timer: mtk: add support for MediaTek MT7981/MT7986 SoCs
This patch add general-purpose timer support for MediaTek MT7981/MT7986.
These two SoCs uses a newer version of timer with its register definition
slightly changed.

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
1ac479587f pwm: mtk: add support for MediaTek MT7981 SoC
This patch adds PWM support for MediaTek MT7981 SoC.
MT7981 uses a different register offset so we have to add a version field
to indicate the IP core version.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
c986dd9f58 pwm: mtk: add support for MediaTek MT7986 SoC
This patch adds PWM support for MediaTek MT7986 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
Weijie Gao
bc15e30346 arm: dts: mt7622: force high-speed mode for uart
The input clock for uart is too slow (25MHz) which introduces frequent data
error on both receiving and transmitting even if the baudrate is 115200.

Using high-speed can significantly solve this issue.

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
3b17f2e2c2 serial: mtk: add support for using dynamic baud clock souce
The baud clock on some platform may change due to assigned-clock-parent
set in DT. In current flow the baud clock is only retrieved during probe
stage. If the parent of the source clock changes after probe stage, the
setbrg will set wrong baudrate.

To get the right clock rate, this patch records the baud clk struct to the
driver's priv, and changes the driver's flow to get the clock rate before
calling _mtk_serial_setbrg().

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
29a48bf9cc net: mediatek: add support for MediaTek MT7981/MT7986
This patch adds support for MediaTek MT7981 and MT7986. Both chips uses
PDMA v2.

Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
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
e7ad046b64 net: mediatek: add support for PDMA v2
This patch adds support for PDMA v2 hardware. The PDMA v2 has extended the
DMA descriptor to 8-words, and some of its fields have changed comparing
to the v1 hardware.

Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
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
7d928c3f27 net: mediatek: stop using bitfileds for DMA descriptors
This patch is a preparation for adding a new version of PDMA of which the
DMA descriptor fields has changed. Using bitfields will result in a complex
modification. Convert bitfields to u32 units can solve this problem easily.

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
625967254c net: mediatek: use a struct to cover variations of all SoCs
Using a single soc id to control different initialization and TX/RX flow
for all SoCs is not extensible if more hardware variations are added in
the future.

This patch introduces a struct to replace the original mtk_soc to allow
the driver be able handle newer hardwares.

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
fccf960e1c mmc: mediatek: add support for MediaTek MT7891/MT7986 SoCs
Add eMMC and SDXC support for MediaTek MT7981/MT7986 SoCs
Both chips support SDXC and eMMC 4.5. MT7986A supports eMMC 5.1.

Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
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
e053ccf6ef board: mediatek: add MT7981 reference boards
This patch adds general board files based on MT7981 SoCs.

MT7981 uses one mmc controller for booting from both SD and eMMC, and the
pins of mmc controller are also shared with spi controller.
So three configs are need for these boot types:

1. mt7981_rfb_defconfig - SPI-NOR and SPI-NAND
2. mt7981_emmc_rfb_defconfig - eMMC only
3. mt7981_sd_rfb_defconfig - SD only

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
389ba6986b board: mediatek: add MT7986 reference boards
Add general board files based on MT7986 SoCs.

MT7986 uses one mmc controller for booting from both SD and eMMC.
Both MT7986A and MT7986B use the same pins for spi controller.

Configs for various boot types:
1. mt7986_rfb_defconfig - SPI-NOR and SPI-NAND for MT7986A/B
2. mt7986a_bpir3_emmc_defconfig - eMMC for MT7986A only
3. mt7986a_bpir3_sd_defconfig - SD for MT7986A only

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
ed86e4fba1 arm: mediatek: add support for MediaTek MT7981 SoC
This patch adds basic support for MediaTek MT7981 SoC.
This include the file that will initialize the SoC after boot and its
device tree.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:15 -04:00
Weijie Gao
10c6233696 arm: mediatek: add support for MediaTek MT7986 SoC
This patch adds basic support for MediaTek MT7986 SoC.
This include the file that will initialize the SoC after boot and its
device tree.

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
Tom Rini
ebdd6afa54 Merge branch 'next' of https://source.denx.de/u-boot/custodians/u-boot-marvell into next
- Enable CONFIG_TIMER for all Kirkwood / MVEBU boards (Stefan)
- u-boot-spl.kwb/SPL: Add / improve size limit setup / detection (Pali)
- mvebu: theadorable: Misc updates in defconfig und dts (Stefan)
2022-09-20 08:50:07 -04:00
Tom Rini
245746e8e0 First set of u-boot-at91 features for the 2023.01 cycle
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Merge tag 'u-boot-at91-2023.01-a' of https://source.denx.de/u-boot/custodians/u-boot-at91 into next

First set of u-boot-at91 features for the 2023.01 cycle:

This feature set includes the important update on PIO4 pinctrl driver
that solves a long time mismatch between Linux and U-boot, related on
the unification of pinctrl and gpio driver support, now respecting the
pinctrl bindings ABI; and also support for pinctrl subnodes. The feature
set also adds support for PDA screen detection for sam9x60_curiosity
board , one fix for SD-Card reinsertion and one fix for sam9x60 clocks.
2022-09-20 08:49:36 -04:00
Stefan Roese
7a6102a613 kirkwood: lsxl: Sync defconfigs
With the recent changes in the Orion timer driver Kconfig setup, the
board specific enabling is not needed any more. This patch sync's these
2 boards with their current defconfig version.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Michael Walle <michael@walle.cc>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
b81db4bfdd arm: mvebu: dts: mvebu-u-boot.dtsi: Add "u-boot, dm-pre-reloc" to timer DT node
Adding the "u-boot,dm-pre-reloc" DT property to the timer node is
necesssary to support the timer in the early boot phases (e.g.
SPL & pre-reloc).

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
d06ba5cc71 arm: mvebu: dts: armada-375.dtsi: Add timer0 & timer1
Add the DT bindings / descriptions for timer0 & timer1, exactly as done
in mainline Linux.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
0cc5d2321f arm: mvebu: dts: Makefile: Compile Armada 375 dtb in a separate step
This patch changes the compilation, so that the Armada 375 board(s) are
compiled in a separate step. This is necessary for the timer dts
conversion, as A375 has a different / timer description in the dts.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
7b530bb19e arm: mvebu: Use CONFIG_TIMER on all MVEBU & KIRKWOOD platforms
Now that the new timer support is available for these platforms, let's
select this IF for all these platforms. This way it's not necessary
that each board changes it's config header.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
a68f13a3b6 timer: orion-timer: Add timer_get_boot_us() for BOOTSTAGE support
Add timer_get_boot_us() to support boards, that have CONFIG_BOOTSTAGE
enabled, like pogo_v4.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
89fd0cccf9 timer: orion-timer: Add support for other Armada SoC's
This patch adds support for other Marvell Armada SoC's, supporting the
25MHz fixed clock operation, like the Armada XP etc.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Tony Dinh <mibodhi@gmail.com>
2022-09-20 06:39:43 +02:00
Stefan Roese
50e4d8511d arm: mvebu: theadorable: Update eth & mdio DT nodes
With the recent changes in the Marvel mvneta network driver, the MDIO
bus is not connected any more. This patch updates the DT nodes to use
the nodes from the dtsi files instead of creating ad-hoc nodes.

Signed-off-by: Stefan Roese <sr@denx.de>
2022-09-20 06:39:43 +02:00
Stefan Roese
c686d35b43 arm: mvebu: theadorable: Misc defconfig changes
- Remove EFI support as it's not used on this board
- Disable CONFIG_FIT_PRINT to reduce the serial output (minimal speedup)

Signed-off-by: Stefan Roese <sr@denx.de>
2022-09-20 06:39:43 +02:00
Pali Rohár
4a08c26647 arm: mvebu: Add default SPL_SIZE_LIMIT for 32-bit SoCs
32-bit Marvell Armada BootROMs limit maximal size of SPL image to 192 kB.
So define 192 kB (= 0x30000) limit as default value for SPL_SIZE_LIMIT.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
2022-09-20 06:39:43 +02:00
Pali Rohár
5138c8fa56 arm: mvebu: turris_omnia: Add CONFIG_BOARD_SIZE_LIMIT
Maximal size of u-boot kwb image binary is $CONFIG_ENV_OFFSET which is
0xF0000 = 983040 bytes. So add missing CONFIG_BOARD_SIZE_LIMIT definition
to ensure that u-boot binary does not overflow to the u-boot env storage.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
2022-09-20 06:39:43 +02:00
Pali Rohár
d285e4b080 Makefile: Add missing CONFIG_BOARD_SIZE_LIMIT check for u-boot-spl.kwb
Currently CONFIG_BOARD_SIZE_LIMIT check is ignored for u-boot-spl.kwb
target. Fix it by adding missing $(BOARD_SIZE_CHECK) macro.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
2022-09-20 06:39:43 +02:00
Tom Rini
e9a1ff9724 Merge branch 'master' into next
Signed-off-by: Tom Rini <trini@konsulko.com>
2022-09-19 16:07:12 -04:00
Tom Rini
f76f3e3b44 Prepare v2022.10-rc5
Signed-off-by: Tom Rini <trini@konsulko.com>
2022-09-19 12:17:04 -04:00
Tom Rini
ddcd2e8fb3 configs: Resync with savedefconfig
Rsync all defconfig files using moveconfig.py

Signed-off-by: Tom Rini <trini@konsulko.com>
2022-09-19 11:22:26 -04:00
Tim Harvey
59f6141362 imx8m*_venice_defconfig: fix default bootcmd
commit 970bf8603b ("Convert CONFIG_USE_BOOTCOMMAND et al to Kconfig")
had an unintended side effect of resulting in a bootcmd env var change
for boards like venice that did not have CONFIG_USE_BOOTCOMMAND defined
and relied on it being defaulted in include/config_distro_bootcmd.h.
Following that patch it instead got defaulted in tools/env/fw_env_private.h

Fix this by enabling CONFIG_USE_BOOTCOMMAND for venice.

Fixes: commit 970bf8603b ("Convert CONFIG_USE_BOOTCOMMAND et al to Kconfig")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
2022-09-19 08:53:50 -04:00
Tom Rini
c1db6be55d u-boot-imx-20220919
-------------------
 
 CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/13500
 
 - Fix imx8mn-beacon-kit-u-boot
 - Merged Purism
 - imxrt1170 (already merged in u-boot-imx)
 - Fixes in crypto FSL
 - Toradex : fixes Verdin
 - Serial Driver: fixes when not used as console
 - DH Boards : fixes + USB
 - Fix CONFIG_SYS_MALLOC_F_LEN (Kconfig)
 - Add imx6ulz_smm_m2
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Merge tag 'u-boot-imx-20220919' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

u-boot-imx-20220919
-------------------

CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/13500

- Fix imx8mn-beacon-kit-u-boot
- Merged Purism
- imxrt1170 (already merged in u-boot-imx)
- Fixes in crypto FSL
- Toradex : fixes Verdin
- Serial Driver: fixes when not used as console
- DH Boards : fixes + USB
- Fix CONFIG_SYS_MALLOC_F_LEN (Kconfig)
- Add imx6ulz_smm_m2
2022-09-19 08:38:32 -04:00
Marek Behún
a0759684e0 powerpc: mpc85xx: Fix incorrect application of patch
I messed up application of patch 5a428e7510 ("mmc: fsl_esdhc_spl: Add
support for builds without CONFIG_SYS_MMC_U_BOOT_OFFS"). I took it from
a work-in-progress branch where I changed usage of
  CONFIG_SDCARD to CONFIG_SD_BOOT
and refactored
  SYS_MPC85XX_NO_RESETVEC
mess.

But these changes aren't in master yet. Fix the wrong usage of these
macros.

Fixes: 5a428e7510 ("mmc: fsl_esdhc_spl: Add support for builds without
CONFIG_SYS_MMC_U_BOOT_OFFS")
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Pali Rohár <pali@kernel.org>
2022-09-19 08:30:58 -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