linux-kernel - [PATCH v6 9/9] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.

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Date:   Mon, 12 Jul 2021 18:03:16 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>
CC:     <steven_lee@...eedtech.com>, <Hongweiz@....com>,
        <ryan_chen@...eedtech.com>, <billy_tsai@...eedtech.com>
Subject: [PATCH v6 9/9] 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@...eedtech.com>
Reviewed-by: Andrew Jeffery <andrew@...id.au>
---
 drivers/gpio/gpio-aspeed-sgpio.c | 4 ++++
 1 file changed, 4 insertions(+)

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);
-- 
2.17.1