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spi: spi-fsl-dspi: Make bus-num property optional

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The SPI bus number is completely optional to Linux, so make the
corresponding device tree property optional as well.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20200305115546.31814-1-s.hauer@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sascha Hauer 2020-03-05 12:55:46 +01:00 committed by Mark Brown
parent c7a1a20e36
commit 29d2daf2c3
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GPG Key ID: 24D68B725D5487D0
2 changed files with 3 additions and 7 deletions
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2
Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
View File

@ -19,11 +19,11 @@ Required properties:
- pinctrl-0: pin control group to be used for this controller. - pinctrl-0: pin control group to be used for this controller.
- pinctrl-names: must contain a "default" entry. - pinctrl-names: must contain a "default" entry.
- spi-num-chipselects : the number of the chipselect signals. - spi-num-chipselects : the number of the chipselect signals.
- bus-num : the slave chip chipselect signal number.
Optional property: Optional property:
- big-endian: If present the dspi device's registers are implemented - big-endian: If present the dspi device's registers are implemented
in big endian mode. in big endian mode.
- bus-num : the slave chip chipselect signal number.
Optional SPI slave node properties: Optional SPI slave node properties:
- fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip - fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip

8
drivers/spi/spi-fsl-dspi.c
View File

@ -1108,7 +1108,7 @@ static int dspi_probe(struct platform_device *pdev)
const struct regmap_config *regmap_config; const struct regmap_config *regmap_config;
struct fsl_dspi_platform_data *pdata; struct fsl_dspi_platform_data *pdata;
struct spi_controller *ctlr; struct spi_controller *ctlr;
int ret, cs_num, bus_num; int ret, cs_num, bus_num = -1;
struct fsl_dspi *dspi; struct fsl_dspi *dspi;
struct resource *res; struct resource *res;
void __iomem *base; void __iomem *base;
@ -1145,11 +1145,7 @@ static int dspi_probe(struct platform_device *pdev)
} }
ctlr->num_chipselect = cs_num; ctlr->num_chipselect = cs_num;
ret = of_property_read_u32(np, "bus-num", &bus_num); of_property_read_u32(np, "bus-num", &bus_num);
if (ret < 0) {
dev_err(&pdev->dev, "can't get bus-num\n");
goto out_ctlr_put;
}
ctlr->bus_num = bus_num; ctlr->bus_num = bus_num;
if (of_property_read_bool(np, "spi-slave")) if (of_property_read_bool(np, "spi-slave"))