Merge series from Cédric Le Goater <clg@kaod.org>:

This series adds a new SPI driver using the spi-mem interface for the
Aspeed static memory controllers of the AST2600, AST2500 and AST2400
SoCs.

 * AST2600 Firmware SPI Memory Controller (FMC)
 * AST2600 SPI Flash Controller (SPI1 and SPI2)
 * AST2500 Firmware SPI Memory Controller (FMC)
 * AST2500 SPI Flash Controller (SPI1 and SPI2)
 * AST2400 New Static Memory Controller (also referred as FMC)
 * AST2400 SPI Flash Controller (SPI)

It is based on the current OpenBMC kernel driver [1], using directly
the MTD SPI-NOR interface and on a patchset [2] previously proposed
adding support for the AST2600 only. This driver takes a slightly
different approach to cover all 6 controllers.

It does not make use of the controller register disabling Address and
Data byte lanes because is not available on the AST2400 SoC. We could
introduce a specific handler for new features available on recent SoCs
if needed. As there is not much difference on performance, the driver
chooses the common denominator: "User mode" which has been heavily
tested in [1]. "User mode" is also used as a fall back method when
flash device mapping window is too small.

Problems to address with spi-mem were the configuration of the mapping
windows and the calibration of the read timings. The driver handles
them in the direct mapping handler when some knowledge on the size of
the flash device is know. It is not perfect but not incorrect either.
The algorithm is one from [1] because it doesn't require the DMA
registers which are not available on all controllers.

Direct mapping for writes is not supported (yet). I have seen some
corruption with writes and I preferred to use the safer and proven
method of the initial driver [1]. We can improve that later.

The driver supports Quad SPI RX transfers on the AST2600 SoC but it
didn't have the expected results. Therefore it is not activated yet.
There are some issues on the pinctrl to investigate first.

Tested on:

 * OpenPOWER Palmetto (AST2400)
 * Facebook Wedge 100 BMC (AST2400) by Tao Ren <rentao.bupt@gmail.com>
 * Evaluation board (AST2500)
 * Inspur FP5280G2 BMC (AST2500) by John Wang <wangzq.jn@gmail.com>
 * Facebook Backpack CMM BMC (AST2500) by Tao Ren <rentao.bupt@gmail.com>
 * OpenPOWER Witherspoon (AST2500)
 * Evaluation board (AST2600 A0 and A3)
 * Rainier board (AST2600)

[1] https://github.com/openbmc/linux/blob/dev-5.15/drivers/mtd/spi-nor/controllers/aspeed-smc.c
[2] https://patchwork.ozlabs.org/project/linux-aspeed/list/?series=212394

Fix the following coccicheck warnings:

drivers/spi/spi-au1550.c:408:21-22: WARNING opportunity for min()
drivers/spi/spi-au1550.c:542:21-22: WARNING opportunity for min()

min() macro is defined in include/linux/minmax.h. It avoids multiple
evaluations of the arguments when non-constant and performs strict
type-checking.
Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
Link: https://lore.kernel.org/r/20220513130333.58379-1-guozhengkui@vivo.comSigned-off-by: Mark Brown <broonie@kernel.org>

In AST2600, the unit of SPI CEx decoding range register is 1MB, and end
address offset is set to the acctual offset - 1MB. If the flash only has
1MB, the end address will has same value as start address, which will
causing unexpected errors.

This patch set the decoding size to at least 2MB to avoid decoding errors.

Tested:
root@bletchley:~# dmesg | grep "aspeed-smc 1e631000.spi: CE0 window"
[   59.328134] aspeed-smc 1e631000.spi: CE0 window resized to 2MB (AST2600 Decoding)
[   59.343001] aspeed-smc 1e631000.spi: CE0 window [ 0x50000000 - 0x50200000 ] 2MB
root@bletchley:~# devmem 0x1e631030
0x00100000
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Potin Lai <potin.lai@quantatw.com>
[ clg : Ported on new spi-mem driver ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-12-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

To accommodate the different response time of SPI transfers on different
boards and different SPI NOR devices, the Aspeed controllers provide a
set of Read Timing Compensation registers to tune the timing delays
depending on the frequency being used. The AST2600 SoC has one of these
registers per device. On the AST2500 and AST2400 SoCs, the timing
register is shared by all devices which is problematic to get good
results other than for one device.

The algorithm first reads a golden buffer at low speed and then performs
reads with different clocks and delay cycle settings to find a breaking
point. This selects a default good frequency for the CEx control register.
The current settings are a bit optimistic as we pick the first delay giving
good results. A safer approach would be to determine an interval and
choose the middle value.

Calibration is performed when the direct mapping for reads is created.
Since the underlying spi-nor object needs to be initialized to create
the spi_mem operation for direct mapping, we should be fine. Having a
specific API would clarify the requirements though.

Cc: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-9-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Extend the driver for the AST2400 SPI Flash Controller (SPI). This
controller has a slightly different interface which requires
adaptation of the 4B handling. Summary of features :

   . host Firmware
   . 1 chip select pin (CE0)
   . slightly different register set, between AST2500 and the legacy
     controller
   . no segment registers
   . single, dual mode.
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-8-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

It is not possible to configure a full 128MB window for a chip of the
same size on the AST2500 SPI controller. For this case, the maximum
window size is restricted to 120MB for CE0.
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-7-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

The segment registers of the FMC/SPI controllers provide a way to
configure the mapping window of the flash device contents on the AHB
bus. Adjust this window to the size of the spi-mem mapping.

Things get more complex with multiple devices. The driver needs to
also adjust the window of the next device to make sure that there is
no overlap, even if there is no available device. The proposal below
is not perfect but it is covering all the cases we have seen on
different boards with one and two devices on the same bus.
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-6-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Use direct mapping to read the flash device contents. This operation
mode is called "Command mode" on Aspeed SoC SMC controllers. It uses a
Control Register for the settings to apply when a memory operation is
performed on the flash device mapping window.

If the window is not big enough, fall back to the "User mode" to
perform the read.

Direct mapping for writes will come later when validated.
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-5-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

This SPI driver adds support for the Aspeed static memory controllers
of the AST2600, AST2500 and AST2400 SoCs using the spi-mem interface.

 * AST2600 Firmware SPI Memory Controller (FMC)
   . BMC firmware
   . 3 chip select pins (CE0 ~ CE2)
   . Only supports SPI type flash memory
   . different segment register interface
   . single, dual and quad mode.

 * AST2600 SPI Flash Controller (SPI1 and SPI2)
   . host firmware
   . 2 chip select pins (CE0 ~ CE1)
   . different segment register interface
   . single, dual and quad mode.

 * AST2500 Firmware SPI Memory Controller (FMC)
   . BMC firmware
   . 3 chip select pins (CE0 ~ CE2)
   . supports SPI type flash memory (CE0-CE1)
   . CE2 can be of NOR type flash but this is not supported by the driver
   . single, dual mode.

 * AST2500 SPI Flash Controller (SPI1 and SPI2)
   . host firmware
   . 2 chip select pins (CE0 ~ CE1)
   . single, dual mode.

 * AST2400 New Static Memory Controller (also referred as FMC)
   . BMC firmware
   . New register set
   . 5 chip select pins (CE0 ∼ CE4)
   . supports NOR flash, NAND flash and SPI flash memory.
   . single, dual and quad mode.

Each controller has a memory range on which flash devices contents are
mapped. Each device is assigned a window that can be changed at bootime
with the Segment Address Registers.

Each SPI flash device can then be accessed in two modes: Command and
User. When in User mode, SPI transfers are initiated with accesses to
the memory segment of a device. When in Command mode, memory
operations on the memory segment of a device generate SPI commands
automatically using a Control Register for the settings.

This initial patch adds support for User mode. Command mode needs a little
more work to check that the memory window on the AHB bus fits the device
size. It will come later when support for direct mapping is added.

Single and dual mode RX transfers are supported. Other types than SPI
are not supported.
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-4-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

The "interrupt" property is optional because it is only necessary for
controllers supporting DMAs (Not implemented yet in the new driver).

Cc: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-3-clg@kaod.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Data type of status variable, that hold the return value of the ISR,
should be irqreturn_t & not u32. This patch updates status variable type
to irqreturn_t.
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Link: https://lore.kernel.org/r/20220512145025.20205-1-amit.kumar-mahapatra@xilinx.comSigned-off-by: Mark Brown <broonie@kernel.org>

This fixes the corresponding warnings during building the docs.
Signed-off-by: Siddh Raman Pant <siddhpant.gh@gmail.com>
Link: https://lore.kernel.org/r/4e6187a4-d0f8-4750-e407-e09cc1c91789@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Currently devres managed removal of the spi_controller happens after
removing the power domain of the host platform_device.While this
does not affect the clean removal of the controller, but affects
graceful removal of the child devices if the child  device removal
requires issuing commands over SPI.

Eg. flash device being soft reset to 1S-1S-1S mode before removal
so that on next probe operations in 1S-1S-1S mode is successful.

Failure is seen when `rmmod spi-cadence-quadspi` is performed:

root@j7-evm:~# rmmod spi_cadence_quadspi
[ 49.230996] cadence-qspi 47050000.spi: QSPI is still busy after 500ms timeout.
[ 49.238209] spi-nor spi1.0: operation failed with -110
[ 49.244457] spi-nor spi1.0: Software reset failed: -110

and on subsequent modprobe the OSPI flash probe fails as it
is in 8D-8D-8D mode since the previous soft reset did not happen.

root@j7-evm:~# modprobe spi_cadence_quadspi
[ 73.253536] spi-nor spi0.0: unrecognized JEDEC id bytes: ff ff ff ff ff ff
[ 73.260476] spi-nor: probe of spi0.0 failed with error -2

This commit adds necessary changes to perform spi_unregister_master()
in the host device remove() so that the child devices are gracefully
removed before the power domain is removed.

changes tested on J721E with mt35xu512aba flash.
Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
Link: https://lore.kernel.org/r/20220511115516.14894-1-vaishnav.a@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

Merge series from patrice.chotard@foss.st.com <patrice.chotard@foss.st.com>
Patrice Chotard <patrice.chotard@foss.st.com>:

From: Patrice Chotard <patrice.chotard@foss.st.com>

This series update flags management in the following cases:
  - In APM mode, don't take care of TCF and TEF flags
  - Always check TCF flag in stm32_qspi_wait_cmd()
  - Don't check BUSY flag when sending new command

Waiting for SR_BUSY bit when receiving a new command is not needed.
SR_BUSY bit is already managed in the previous command treatment.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20220511074644.558874-4-patrice.chotard@foss.st.comSigned-off-by: Mark Brown <broonie@kernel.org>

Currently, SR_TCF flag is checked in case there is data, this criteria
is not correct.

SR_TCF flags is set when programmed number of bytes has been transferred
to the memory device ("bytes" comprised command and data send to the
SPI device).
So even if there is no data, we must check SR_TCF flag.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20220511074644.558874-3-patrice.chotard@foss.st.comSigned-off-by: Mark Brown <broonie@kernel.org>

In APM mode, TCF and TEF flags are not set. To avoid timeout in
stm32_qspi_wait_cmd(), don't check if TCF/TEF are set.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reported-by: eberhard.stoll@kontron.de
Link: https://lore.kernel.org/r/20220511074644.558874-2-patrice.chotard@foss.st.comSigned-off-by: Mark Brown <broonie@kernel.org>

Remove a couple of unnecessary casts to `(void *)` when initializing the
`.data` members in the device ID table.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20220510115141.212779-3-abbotti@mev.co.ukSigned-off-by: Mark Brown <broonie@kernel.org>

Fix "WARNING: Missing a blank line after declarations" reported by
checkpatch.pl.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20220510115141.212779-2-abbotti@mev.co.ukSigned-off-by: Mark Brown <broonie@kernel.org>

In mx51_ecspi_prepare_message() the MX51_ECSPI_CONFIG register is
setup for the current spi_message. After writing the register, there
is a delay to ensure that the changes hit the hardware.

This patch checks if the register MX51_ECSPI_CONFIG actually needs to
be changed. If the register content is unchanged the function is left
early, skipping the write to the hardware and the delay. This leads to
a small, but measurable performance increase. For a given workload
with small transfers on an imx6 single core the CPU load decreases
from 30% to ~27%.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-10-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

The driver supports several modes, one of them is PIO/IRQ
"spi_imx_pio_transfer()". The data is exchanged with the IP core using
PIO, an IRQ is setup to signal empty/full FIFOs and the end of the
transfer. The IRQ and scheduling overhead for short transfers is
significant. Using polling instead of IRQs can be beneficial to reduce
the overall CPU load, especially on small transfer workloads.

On an imx6 single core, a given RX workload of the mcp251xfd driver
results in 40% CPU load. Using polling mode reduces the CPU load to
30%.

This patch adds PIO polling support to the driver. For transfers with
a duration of less than 30 µs the polling mode instead of IRQ based
PIO mode is used. 30 µs seems to be a good compromise, which is used
the by the SPI drivers for the raspberry Pi (spi-bcm2835,
spi-bcm2835), too.
Co-developed-by: David Jander <david@protonic.nl>
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-9-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

There's no need to embed the struct spi_bitbang into our private
data (struct spi_imx_data), the spi core is flexible enough, so that
we only need a pointer to the allocated struct spi_controller.

This is also a preparation patch to add PIO based polling support to
the driver.
Co-developed-by: David Jander <david@protonic.nl>
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-8-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

With patch:
| 8caab75f ("spi: Generalize SPI "master" to "controller"")
the SPI "master" was generalized to "controller". This patch completed
the conversion of the spi-imx driver by replacing the remaining
occurrences of master to controller.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-7-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

This patch replaces an open coded swahw32s().
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-6-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

This patch fixes the following sparse warning by using a swab32s()
instead of a cpu_to_be32(). The driver is used on little endian
systems only and we really want to swap the bytes.

| drivers/spi/spi-imx.c:305:29: warning: incorrect type in assignment (different base types)
| drivers/spi/spi-imx.c:305:29:    expected unsigned int val
| drivers/spi/spi-imx.c:305:29:    got restricted __be32 [usertype]
| drivers/spi/spi-imx.c:361:21: warning: incorrect type in assignment (different base types)
| drivers/spi/spi-imx.c:361:21:    expected unsigned int [assigned] [usertype] val
| drivers/spi/spi-imx.c:361:21:    got restricted __be32 [usertype]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-5-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

This patch fixes the following checkpatch warning, by making val an
"unsigned int".

| WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
| +       unsigned val = 0;
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-4-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

This patch fixes the following checkpatch warning by removing the
trailing backslash:

| WARNING: Avoid unnecessary line continuations
| +       spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-3-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

This patch fixes the following and similar sparse warnings by adding
the missing identifier names to the function definitions:

| WARNING: function definition argument 'struct spi_imx_data *' should also have an identifier name
| #68: FILE: drivers/spi/spi-imx.c:68:
| +       int (*prepare_message)(struct spi_imx_data *, struct spi_message *);
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-2-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

It will cause null-ptr-deref if platform_get_resource_byname() returns NULL,
we need check the return value.

Fixes: 858e26a5 ("spi: spi-fsl-qspi: Reduce devm_ioremap size to 4 times AHB buffer size")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220505093954.1285615-1-yangyingliang@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

The module omap2-mcspi does not support the interword delay
parameter present in the spi transfer. On one side, if the module
is instructed to use the dma, this parameter is correctly ignored.
However, without the usage of the dma, that parameter should be
used.

The patch introduce the handling of such delay in the omap2-mcspi
module, using standard spi_delay struct. The patch has been tested
using as benchmark a DM3730.

The delay function used (spi_delay_exec) is already present in the
kernel and it checks on its own the validity of the input, as such,
no additional checks are present.

The range of usage of the udelay function is incremented to 200 us,
as the change from udelay to usleep_range introduces not
neglectible delays.
Signed-off-by: Andrea Zanotti <andreazanottifo@gmail.com>
Link: https://lore.kernel.org/r/20220502111300.24754-1-andreazanottifo@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Add RSPI binding documentation for Renesas RZ/G2UL SoC.

RSPI block is identical to one found on RZ/A, so no driver changes are
required. The fallback compatible string "renesas,rspi-rz" will be used
on RZ/G2UL.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220501082150.24662-1-biju.das.jz@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Return -ENOMEM of there is a dma mapping error.  Do not return success.

Fixes: 764f1b74 ("spi: add driver for MTK SPI NAND Flash Interface")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Chuanhong Guo <gch981213@gmail.com>
Link: https://lore.kernel.org/r/YmwjUcTKyQNrrn2g@kiliSigned-off-by: Mark Brown <broonie@kernel.org>

The Cadence QSPI compatible string required for the SoCFPGA platform
changed from the default "cdns,qspi-nor" to "intel,socfpga-qspi" with
the introduction of an additional quirk in
commit 98d948eb ("spi: cadence-quadspi: fix write completion support").
However, that change did not preserve the previously used
quirk for this platform.  Reinstate the `CQSPI_DISABLE_DAC_MODE` quirk
for the SoCFPGA platform.

Fixes: 98d948eb ("spi: cadence-quadspi: fix write completion support")
Cc: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20220427153446.10113-1-abbotti@mev.co.ukSigned-off-by: Mark Brown <broonie@kernel.org>

Add device-tree binding documentation for Mediatek SPI-NAND Flash
Interface.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220424032527.673605-5-gch981213@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

This driver implements support for the SPI-NAND mode of MTK NAND Flash
Interface as a SPI-MEM controller with pipelined ECC capability.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/20220424032527.673605-3-gch981213@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Mediatek ECC changes:
* Also parse the default nand-ecc-engine property if available
* Make mtk_ecc.c a separated module

needed for SPI controller driver

The recently added ECC engine support introduced a generic property
named nand-ecc-engine for ecc engine phandle. This patch adds support
for this new property.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220424032527.673605-4-gch981213@gmail.com

this code will be used in mediatek snfi spi-mem controller with
pipelined ECC engine.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220424032527.673605-2-gch981213@gmail.com

Merge series from 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>:

1.Add support for using GPIOs as chip select lines on Ingenic SoCs.
2.Add support for probing the spi-ingenic driver on the JZ4775 SoC,
  the X1000 SoC, and the X2000 SoC.
3.Modify annotation texts to be more in line with the current state.

Since version 5.13, the standard syscon bindings have been added
to all clps711x DT nodes, so we can now use the more general
syscon_regmap_lookup_by_phandle function to get the syscon pointer.
Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Link: https://lore.kernel.org/r/20220420061038.22570-1-eagle.alexander923@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>