gpio/aspeed: Fix incorrect number of banks

[ Upstream commit 3c4710ae6f883f9c6e3df5e27e274702a1221c57 ]

The current calculation for the number of GPIO banks is only correct if
the number of GPIOs is a multiple of 32 (if there were 31 GPIOs we would
currently say there are 0 banks, which is incorrect).

Fixes: 361b79119a4b7 ('gpio: Add Aspeed driver')

Signed-off-by: Rashmica Gupta <rashmica.g@gmail.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20190906062623.13354-1-rashmica.g@gmail.com
Reviewed-by: Joel Stanley <joel@jms.d.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index b696ec3..e627e0e 100644 (file)
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -1199,7 +1199,7 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
        gpio->chip.irq.need_valid_mask = true;
 
        /* Allocate a cache of the output registers */
-       banks = gpio->config->nr_gpios >> 5;
+       banks = DIV_ROUND_UP(gpio->config->nr_gpios, 32);
        gpio->dcache = devm_kcalloc(&pdev->dev,
                                    banks, sizeof(u32), GFP_KERNEL);
        if (!gpio->dcache)