If bits_per_word is configured, transfer only word amount
of data per iteration.
Signed-off-by: Oskari Lemmela <oskari@lemmela.net>
Link: https://lore.kernel.org/r/20211222055958.1383233-2-oskari@lemmela.netSigned-off-by: Mark Brown <broonie@kernel.org>

Propagate firmware node by using a specific API call, i.e. device_set_node().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211222155739.7699-3-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Propagate firmware node by using a specific API call, i.e. device_set_node().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20211222155739.7699-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Propagate firmware node by using a specific API call, i.e. device_set_node().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211222155739.7699-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Add missing delay between transferred messages and words.
Signed-off-by: Oskari Lemmela <oskari@lemmela.net>
Link: https://lore.kernel.org/r/20211222055958.1383233-3-oskari@lemmela.netSigned-off-by: Mark Brown <broonie@kernel.org>

Some mtk spi nor has dedicated dma(s) inside. Add a new clock name, axi,
for spi nor dma bus clock.
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Link: https://lore.kernel.org/r/20211220121825.6446-3-tinghan.shen@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sama7g5 embedds 2 instances of the QSPI controller:
1/ One Octal Serial Peripheral Interface (QSPI0) Supporting up to
   200 MHz DDR. Octal, TwinQuad, HyperFlash and OctaFlash Protocols
   Supported
2/ One Quad Serial Peripheral Interface (QSPI1) Supporting Up to
   90 MHz DDR/133 MHz SDR
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211209122939.339810-3-tudor.ambarus@microchip.comSigned-off-by: Mark Brown <broonie@kernel.org>

Convert the Atmel QuadSPI controller Device Tree binding documentation
to json-schema.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211209122939.339810-2-tudor.ambarus@microchip.comSigned-off-by: Mark Brown <broonie@kernel.org>

Move the cs_setup delay to the end of spi_set_cs.

From include/linux/spi/spi.h:

 * @cs_setup: delay to be introduced by the controller after CS is
   asserted

The cs_setup delay needs to happen *after* CS is asserted, that is, at
the end of spi_set_cs, not at the beginning. Otherwise we're just
delaying before the SPI transaction starts at all, which isn't very
useful.

No drivers use this right now, but that is likely to change soon with an
upcoming Apple SPI HID transport driver.

Fixes: 25093bde ("spi: implement SW control for CS times")
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20211210170534.177139-1-marcan@marcan.stSigned-off-by: Mark Brown <broonie@kernel.org>

The spi-peripheral-props.yaml schema contains peripheral-specific
properties for SPI controllers that should be present in the peripheral
node. Add a reference to that so its constraints are followed.

additionalProperties: false cannot be used since it marks the controller
properties as unknown. Use unevaluatedProperties: false instead. This
has the side effect of allowing extra properties that are not specified
in the schema. The alternative is to list all the controller properties
in this schema but that would mean every peripheral binding would have
to repeat the same set of properties for each controller.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211109181911.2251-4-p.yadav@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

The spi-peripheral-props.yaml schema contains peripheral-specific
properties for SPI controllers that should be present in the peripheral
node. Move peripheral-specific properties to a separate file and refer
to it in spi-peripheral-props.yaml.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211109181911.2251-3-p.yadav@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

Many SPI controllers need to add properties to peripheral devices. This
could be the delay in clock or data lines, etc. These properties are
controller specific but need to be defined in the peripheral node
because they are per-peripheral and there can be multiple peripherals
attached to a controller.

If these properties are not added to the peripheral binding, then the
dtbs check emits a warning. But these properties do not make much sense
in the peripheral binding because they are controller-specific and they
will just pollute every peripheral binding. So this binding is added to
collect all such properties from all such controllers. Peripheral
bindings should simply refer to this binding and they should be rid of
the warnings.

There are some limitations with this approach. Firstly, there is no way
to specify required properties. The schema contains properties for all
controllers and there is no way to know which controller is being used.
Secondly, there is no way to restrict additional properties. Since this
schema will be used with an allOf operator, additionalProperties needs
to be true. In addition, the peripheral schema will have to set
unevaluatedProperties: false.

Despite these limitations, this appears to be the best solution to this
problem that doesn't involve modifying existing tools or schema specs.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211109181911.2251-2-p.yadav@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

There is no user of the enable_loopback member in the struct pxa2xx_spi_chip.
Remote this legacy member completely.

The mentioned in the documentation the testing phase can be performed with
spidev_test tool.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211123192723.44537-3-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Since the last user of the custom ->cs_control() gone, we may get rid of
this legacy API completely.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211123192723.44537-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

SPI PXA2xx driver supports GPIO chipselect by querying for known
GPIO connection ID. Replace custom ->cs_control() by GPIO table,
so the driver will use generic approach on this platform.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211123192723.44537-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Use devm alloc call to allocate memory for spi controller data and
remove free calls from cleanup.
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Link: https://lore.kernel.org/r/1637834152-32093-1-git-send-email-kyarlagadda@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>

The 'direction' member of 'struct dma_slave_config' is deprecated.
Instead, drivers should use the direction argument to the
device_prep_slave_sg and device_prep_dma_cyclic functions or the
dir field in the dma_interleaved_template structure.
spi-atmel uses the direction argument to dmaengine_prep_slave_sg.
slave_config.direction is not used in neither of the DMA controller
drivers (at_h/xdmac) that spi-atmel is using, we can just remove the
setting of slave_config.direction and live with whatever stack value
is there.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211125124110.838037-3-tudor.ambarus@microchip.comSigned-off-by: Mark Brown <broonie@kernel.org>

The callers passed a pointer to slave_config as an argument of
atmel_spi_dma_slave_config(), but they did not use it afterwards.
Use instead a local variable in atmel_spi_dma_slave_config(), and
stop passing arguments that are not needed in the callers.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211125124110.838037-2-tudor.ambarus@microchip.comSigned-off-by: Mark Brown <broonie@kernel.org>

Check if the transfer parameters have changed from previous settings
before applying new parameters.
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Link: https://lore.kernel.org/r/20211124193353.32311-3-kdasu.kdev@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Check requested speed for a given transfer before setting
27MHz or 108Mhz sysclk on SoCs that support both. This way
for baud rates below 212Khz we can use 27Mhz clock.
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Link: https://lore.kernel.org/r/20211124193353.32311-2-kdasu.kdev@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

The recent commit 3f076575 ("spi: deduplicate spi_match_id()
in __spi_register_driver()") inadvertently inverted a condition
that provokes a (harmless) warning:

  WARNING KERN SPI driver mtd_dataflash has no spi_device_id for atmel,at45

Restore logic to avoid such warning to be issued.

Fixes: 3f076575 ("spi: deduplicate spi_match_id() in __spi_register_driver()")
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20211123170034.41253-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Some Device Trees don't use a real device name in the compatible string
for SPI devices nodes, abusing the fact that the spidev driver name is
used to match as a fallback when a SPI device ID table is not defined.

But since commit 6840615f ("spi: spidev: Add SPI ID table") a table
for SPI device IDs was added to the driver breaking the assumption that
these DTs were relying on.

There has been a warning message for some time since commit 956b200a
("spi: spidev: Warn loudly if instantiated from DT as "spidev""), making
quite clear that this case is not really supported by the spidev driver.

Since these devices won't match anyways after the mentioned commit, there
is no point to continue if an spidev compatible is used. Let's just make
the driver probe to fail early.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20211109225920.1158920-1-javierm@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>

Since the commit 196b0e2c ("spi: pxa2xx: Remove if statement
that is always true in pump_transfers()") the ->read() and ->write()
methods in the struct driver_data are reconfigured for each transfer.
Hence no need to keep the intermediate state in the struct chip_data.

The same applies to n_bytes member of the same data structure.
Get rid of unneeded storage for good.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211122200622.43305-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Currently the 16-bit mode is what being used in user space.
However assuming that is not fully correct. Instead we should
use the respective mask, i.e. SPI_MODE_USER_MASK, which
precisely defines what bits are available for user space apps.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211122175245.84691-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

  /*
   * Fix multi-line comment style as in this short example. Pay attention
   * to the capitalization, period and starting line of the text.
   */

While at it, split the (supposedly short) description of couple of functions
to summary (short description) and (long) description.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211122171721.61553-3-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

krealloc() as any other kernel memory allocation calls accepts GFP flags,
one of which is __GFP_ZERO. Hence, no need to call memset() explicitly on
the reallocated buffer.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211122171721.61553-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

The lpspi on i.MX8ULP is derived from i.MX7ULP, it uses two
compatible strings, so update the comaptible string for i.MX8ULP.
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211120113454.785997-4-peng.fan@oss.nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

The same logic is used in spi_match_id() and in the __spi_register_driver().
By switching the former from taking struct spi_device * to const char * as
the second parameter we may deduplicate the code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211119173718.52938-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Some PL022 implementations provide a reset line to the silicon
IP block, add a device tree property for this.

Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20211120011715.2630873-1-linus.walleij@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

This doc is fairly outdated and only uses legacy device instantiation
terminology. Let us update it and also mention the OF and ACPI device
tables, to make easier for users to figure out how should be defined.

Also, mention that devices bind could be done in user-space now using
the "driver_override" sysfs entry.
Suggested-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20211119121139.2412761-1-javierm@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>

Merge series from Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>:

This patch series adds RSPI driver and dt binding support to RZ/G2L SoC.

Commit b59c1224 ("spi: spi-geni-qcom: Add support for GPI dma")
added GPI support but also added unused defines, so remove them
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20211117133110.2682631-1-vkoul@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

"ret" variable is already declared in qspi_transfer_in() at the
beginning of function, drop redeclaring ret in the if block, fixing
below:

spi-rspi.c: In function ‘qspi_transfer_in’:
spi-rspi.c:838:7: warning: declaration of ‘ret’ shadows a previous local
  838 |   int ret = rspi_dma_transfer(rspi, NULL, &xfer->rx_sg);
      |       ^~~
spi-rspi.c:835:6: note: shadowed declaration is here
  835 |  int ret;

Fixes: db300838 ("spi: rspi: avoid uninitialized variable access")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211118031041.2312-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

On RZ/G2L SoC we need to explicitly deassert the reset line
for the device to work, use this opportunity to deassert/assert
reset line in spi-rspi driver.

This patch adds support to read the "resets" property (if available)
from DT and perform deassert/assert when required.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211118031041.2312-3-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Add RSPI binding documentation for Renesas RZ/G2L 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/G2L.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211118031041.2312-2-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Change the debugfs directory name from hisi_spi65535 to hisi_spi0.

Fixes: 2b2142f2 ("spi: hisi-kunpeng: Add debugfs support")
Signed-off-by: oujiefeng <oujiefeng@huawei.com>
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/20211117012119.55558-1-f.fangjian@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

Since the DW_SPI_CAP_DWC_HSSI capability has just been replaced with using
the DW SSI IP-core versions interface, the DW SPI capability flags are now
represented with a gap. Let's fix it by redefining the DW_SPI_CAP_DFS32
macro to setting BIT(2) of the capabilities field.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20211115181917.7521-8-Sergey.Semin@baikalelectronics.ruSigned-off-by: Mark Brown <broonie@kernel.org>

Since there is a common IP-core and component versions interface available
we can use it to differentiate the DW HSSI device features in the code.
Let's remove the corresponding DWC_HSSI capability flag then and use the
dw_spi_ip_is() macro instead.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20211115181917.7521-7-Sergey.Semin@baikalelectronics.ruSigned-off-by: Mark Brown <broonie@kernel.org>

The driver currently supports two IP-core versions. It's DW APB SSI which
is older version of the controller with APB system bus interface, and DW
SSI controller with AHB bus interface. The later one is supposed to be a
new generation high-speed SSI. Even though both of these IP-cores have got
an almost identical registers space there are some differences. The driver
differentiates these distinctions by the DW_SPI_CAP_DWC_HSSI capability
flag. In addition to that each DW SSI IP-core is equipped with a Synopsys
Component version register, which encodes the IP-core release ID the has
been synthesized from. Seeing we are going to need the later one to
differentiate some controller peculiarities it would be better to have a
unified interface for both IP-core line and release versions instead of
using each of them separately.

Introduced here IP-core versioning interface consists of two parts:
1) IDs of the IP-core (virtual) and component versions.
2) a set of macro helpers to identify current IP-core and component
versions.

So the platform code is supposed to assign a proper IP-core version based
on it's platform -knowledge. The main driver initialization method reads
the IP-core release ID from the SSI component version register. That data
is used by the helpers to distinguish one IP-core release from another.
Thus the rest of the driver can use these macros to implement the
conditional code execution based on the specified IP-core and version IDs.

Collect the IP-core versions interface and the defined capabilities at the
top of the header file since they represent a common device description
data and so to immediately available for the driver hackers.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20211115181917.7521-6-Sergey.Semin@baikalelectronics.ruSigned-off-by: Mark Brown <broonie@kernel.org>

The driver has been using the offset/bitwise-shift-based approach for the
CSR fields R/W operations since it was merged into the kernel. It can be
simplified by using the macros defined in the linux/bitfield.h and
linux/bit.h header files like BIT(), GENMASK(), FIELD_PREP(), FIELD_GET(),
etc where it is required, for instance in the cached cr0 preparation
method. Thus in order to have the FIELD_*()-macros utilized we just need
to convert the macros with the CSR-fields offsets to the masks with the
corresponding registers fields definition. That's where the GENMASK() and
BIT() macros come in handy. After that the masks can be used in the
FIELD_*()-macros where it's appropriate.

We also need to convert the macros with the CRS-bit flags using the manual
bitwise shift operations (x << y) to using the BIT() macro. Thus we'll
have a more coherent set of the CSR-related macros.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20211115181917.7521-5-Sergey.Semin@baikalelectronics.ruSigned-off-by: Mark Brown <broonie@kernel.org>