diff options
| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2013-01-25 08:39:34 (GMT) |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-01-26 07:35:56 (GMT) |
| commit | 0202a32d5f4a129ced47db76001f958cd33adeb7 (patch) | |
| tree | 563b6db1bc77fac5b0bf02d65130dd0f36191ec7 /drivers/spi/spi-gpio.c | |
| parent | 3343b7a6d2cd0a980d0c4a0ce02ef48b6bfcc12a (diff) | |
| download | linux-0202a32d5f4a129ced47db76001f958cd33adeb7.tar.xz | |
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>
Diffstat (limited to 'drivers/spi/spi-gpio.c')
| -rw-r--r-- | drivers/spi/spi-gpio.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c index c7cf0b7..9ddef55 100644 --- a/drivers/spi/spi-gpio.c +++ b/drivers/spi/spi-gpio.c @@ -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) { |