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authorNicolas Boichat <drinkcat@chromium.org>2015-11-09 12:14:51 +0800
committerMark Brown <broonie@kernel.org>2015-11-16 17:44:57 +0000
commit98c8dccf2b2771fb622d449b2ec1604fc5d260e5 (patch)
tree8ec9304fd36f1c224f3e0cf5677997cd55ca3581 /drivers/spi/spi-mt65xx.c
parent8005c49d9aea74d382f474ce11afbbc7d7130bec (diff)
downloadlinux-98c8dccf2b2771fb622d449b2ec1604fc5d260e5.tar.bz2
spi: mediatek: single device does not require cs_gpios
When only one device is present, it is not necessary to specify cs_gpios, as the CS line can be controlled by the hardware module. Without this patch, older device tree bindings used before 37457607 "spi: mediatek: mt8173 spi multiple devices support" would cause a panic on boot. This fixes the crash, and re-introduces backward compatibility. Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Acked-by: Leilk Liu <leilk.liu@mediatek.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-mt65xx.c')
-rw-r--r--drivers/spi/spi-mt65xx.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 563954a61424..7840067062a8 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -410,7 +410,7 @@ static int mtk_spi_setup(struct spi_device *spi)
if (!spi->controller_data)
spi->controller_data = (void *)&mtk_default_chip_info;
- if (mdata->dev_comp->need_pad_sel)
+ if (mdata->dev_comp->need_pad_sel && gpio_is_valid(spi->cs_gpio))
gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
return 0;
@@ -632,13 +632,23 @@ static int mtk_spi_probe(struct platform_device *pdev)
goto err_put_master;
}
- for (i = 0; i < master->num_chipselect; i++) {
- ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i],
- dev_name(&pdev->dev));
- if (ret) {
- dev_err(&pdev->dev,
- "can't get CS GPIO %i\n", i);
- goto err_put_master;
+ if (!master->cs_gpios && master->num_chipselect > 1) {
+ dev_err(&pdev->dev,
+ "cs_gpios not specified and num_chipselect > 1\n");
+ ret = -EINVAL;
+ goto err_put_master;
+ }
+
+ if (master->cs_gpios) {
+ for (i = 0; i < master->num_chipselect; i++) {
+ ret = devm_gpio_request(&pdev->dev,
+ master->cs_gpios[i],
+ dev_name(&pdev->dev));
+ if (ret) {
+ dev_err(&pdev->dev,
+ "can't get CS GPIO %i\n", i);
+ goto err_put_master;
+ }
}
}
}