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The property "fsl,spi-num-chipselects" is gone since commit 790739c4417c
("dt-bindings: spi: Convert imx cspi to json-schema").
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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The conversion of the spi-imx driver to use GPIO descriptors
in commit 8cdcd8aeee28 ("spi: imx/fsl-lpspi: Convert to GPIO descriptors")
helped to detect the following SPI chipselect polarity mismatch on an
imx6q-sabresd:
[ 4.854337] m25p80@0 enforce active low on chipselect handle
Prior to the above commit, the chipselect polarity passed via cs-gpios
property was ignored and considered active-low.
The reason for such mismatch is clearly explained in the comments inside
drivers/gpio/gpiolib-of.c:
* SPI children have active low chip selects
* by default. This can be specified negatively
* by just omitting "spi-cs-high" in the
* device node, or actively by tagging on
* GPIO_ACTIVE_LOW as flag in the device
* tree. If the line is simultaneously
* tagged as active low in the device tree
* and has the "spi-cs-high" set, we get a
* conflict and the "spi-cs-high" flag will
* take precedence.
To properly represent the SPI chipselect polarity, change it to active-low
when the "spi-cs-high" property is absent.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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The patch adds the following interfaces according the SMARC Spec 1.1
[1] and provided schematics:
- SMARC SPI0/1
Note: Since Kontron still uses silicon revisions below 1.3 they have
add a spi-nor to implement Workaround #1 of erratum ERR006282.
- SMARC SDIO
- SMARC LCD
- SMARC HDMI
- SMARC Management pins
Note: Kontron don't route all of these pins to the i.MX6, some are
routed to the SoM CPLD.
- SMARC GPIO
- SMARC CSI Camera
Note: As specified in [1] the data lanes are shared to cover the
csi and the parallel case. The case depends on the baseboard so
muxing the data lanes is not part of this patch.
- SMARC I2S
- SMARC Watchdog
Note: The watchdog output pin is routed to the CPLD and the SMARC
header. The CPLD performs a reset after a 30s timeout so we
need to enable the watchdog per default.
- SMARC module eeprom
Due to the lack of hardware not all of these interfaces are tesetd.
[1] https://sget.org/standards/smarc
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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