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spi: mediatek: single device does not require cs_gpios

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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>
This commit is contained in:
Nicolas Boichat 2015-11-09 12:14:51 +08:00 committed by Mark Brown
parent 8005c49d9a
commit 98c8dccf2b
1 changed files with 18 additions and 8 deletions
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14
drivers/spi/spi-mt65xx.c
View File

@ -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;
@ -632,8 +632,17 @@ static int mtk_spi_probe(struct platform_device *pdev)
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],
ret = devm_gpio_request(&pdev->dev,
master->cs_gpios[i],
dev_name(&pdev->dev));
if (ret) {
dev_err(&pdev->dev,
@ -642,6 +651,7 @@ static int mtk_spi_probe(struct platform_device *pdev)
}
}
}
}
return 0;