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>
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@ -365,9 +365,26 @@ static int spi_gpio_probe_dt(struct platform_device *pdev)
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if (!pdata)
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return -ENOMEM;
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pdata->sck = of_get_named_gpio(np, "gpio-sck", 0);
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pdata->miso = of_get_named_gpio(np, "gpio-miso", 0);
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pdata->mosi = of_get_named_gpio(np, "gpio-mosi", 0);
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ret = of_get_named_gpio(np, "gpio-sck", 0);
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if (ret < 0) {
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dev_err(&pdev->dev, "gpio-sck property not found\n");
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goto error_free;
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}
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pdata->sck = ret;
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ret = of_get_named_gpio(np, "gpio-miso", 0);
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if (ret < 0) {
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dev_info(&pdev->dev, "gpio-miso property not found, switching to no-rx mode\n");
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pdata->miso = SPI_GPIO_NO_MISO;
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} else
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pdata->miso = ret;
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ret = of_get_named_gpio(np, "gpio-mosi", 0);
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if (ret < 0) {
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dev_info(&pdev->dev, "gpio-mosi property not found, switching to no-tx mode\n");
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pdata->mosi = SPI_GPIO_NO_MOSI;
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} else
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pdata->mosi = ret;
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ret = of_property_read_u32(np, "num-chipselects", &tmp);
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if (ret < 0) {
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