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spi: spi-gpio: Add checks for the dt properties 

The bindings assumed that the gpios properties were always there, which
made the NO_TX and NO_RX mode not usable from device tree. Add extra
checks to make sure that the driver can work if either MOSI or MISO is
not used.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Maxime Ripard 2013-01-25 09:39:34 +01:00 committed by Mark Brown
parent 3343b7a6d2
commit 0202a32d5f
1 changed files with 20 additions and 3 deletions
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23
drivers/spi/spi-gpio.c
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@ -365,9 +365,26 @@ static int spi_gpio_probe_dt(struct platform_device *pdev)
if (!pdata)
return -ENOMEM;
pdata->sck = of_get_named_gpio(np, "gpio-sck", 0);
pdata->miso = of_get_named_gpio(np, "gpio-miso", 0);
pdata->mosi = of_get_named_gpio(np, "gpio-mosi", 0);
ret = of_get_named_gpio(np, "gpio-sck", 0);
if (ret < 0) {
dev_err(&pdev->dev, "gpio-sck property not found\n");
goto error_free;
}
pdata->sck = ret;
ret = of_get_named_gpio(np, "gpio-miso", 0);
if (ret < 0) {
dev_info(&pdev->dev, "gpio-miso property not found, switching to no-rx mode\n");
pdata->miso = SPI_GPIO_NO_MISO;
} else
pdata->miso = ret;
ret = of_get_named_gpio(np, "gpio-mosi", 0);
if (ret < 0) {
dev_info(&pdev->dev, "gpio-mosi property not found, switching to no-tx mode\n");
pdata->mosi = SPI_GPIO_NO_MOSI;
} else
pdata->mosi = ret;
ret = of_property_read_u32(np, "num-chipselects", &tmp);
if (ret < 0) {