diff options
| author | Steven Lee <steven_lee@aspeedtech.com> | 2021-07-12 12:03:16 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2021-08-05 21:16:54 +0200 |
| commit | f43837f4f63b1a58084d7147b8b34c0f3dd261f6 (patch) | |
| tree | 3908b4e379d24c4e429e72775980c5fad1442809 /drivers | |
| parent | gpio: gpio-aspeed-sgpio: Use generic device property APIs (diff) | |
| download | linux-f43837f4f63b1a58084d7147b8b34c0f3dd261f6.tar.xz linux-f43837f4f63b1a58084d7147b8b34c0f3dd261f6.zip | |
gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.
Add an else-if condition in the probe function to check whether ngpios is
multiple of 8.
Per AST datasheet, numbers of available serial GPIO pins in Serial GPIO
Configuration Register must be n bytes. For instance, if n = 1, it means
AST SoC supports 8 GPIO pins.
Signed-off-by: Steven Lee <steven_lee@aspeedtech.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/gpio-aspeed-sgpio.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-aspeed-sgpio.c b/drivers/gpio/gpio-aspeed-sgpio.c index b3d05fc724f0..191b82a2560c 100644 --- a/drivers/gpio/gpio-aspeed-sgpio.c +++ b/drivers/gpio/gpio-aspeed-sgpio.c @@ -537,6 +537,10 @@ static int __init aspeed_sgpio_probe(struct platform_device *pdev) if (rc < 0) { dev_err(&pdev->dev, "Could not read ngpios property\n"); return -EINVAL; + } else if (nr_gpios % 8) { + dev_err(&pdev->dev, "Number of GPIOs not multiple of 8: %d\n", + nr_gpios); + return -EINVAL; } rc = device_property_read_u32(&pdev->dev, "bus-frequency", &sgpio_freq); |