From: Steven Lee <steven_lee@aspeedtech.com>
To: Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Rob Herring <robh+dt@kernel.org>, Joel Stanley <joel@jms.id.au>,
Andrew Jeffery <andrew@aj.id.au>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"moderated list:ARM/ASPEED MACHINE SUPPORT"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/ASPEED MACHINE SUPPORT"
<linux-aspeed@lists.ozlabs.org>,
open list <linux-kernel@vger.kernel.org>
Cc: <steven_lee@aspeedtech.com>, <Hongweiz@ami.com>,
<ryan_chen@aspeedtech.com>, <billy_tsai@aspeedtech.com>
Subject: [PATCH v6 9/9] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.
Date: Mon, 12 Jul 2021 18:03:16 +0800 [thread overview]
Message-ID: <20210712100317.23298-10-steven_lee@aspeedtech.com> (raw)
In-Reply-To: <20210712100317.23298-1-steven_lee@aspeedtech.com>
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>
---
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
next prev parent reply other threads:[~2021-07-12 10:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-12 10:03 [PATCH v6 0/9] ASPEED sgpio driver enhancement Steven Lee
2021-07-12 10:03 ` [PATCH v6 1/9] dt-bindings: aspeed-sgpio: Convert txt bindings to yaml Steven Lee
2021-07-23 9:55 ` Linus Walleij
2021-07-12 10:03 ` [PATCH v6 2/9] dt-bindings: aspeed-sgpio: Add ast2600 sgpio Steven Lee
2021-07-13 22:44 ` Rob Herring
2021-07-23 9:55 ` Linus Walleij
2021-07-12 10:03 ` [PATCH v6 3/9] ARM: dts: aspeed-g6: Add SGPIO node Steven Lee
2021-07-12 10:03 ` [PATCH v6 4/9] ARM: dts: aspeed-g5: Remove ngpios from sgpio node Steven Lee
2021-07-12 10:03 ` [PATCH v6 5/9] gpio: gpio-aspeed-sgpio: Add AST2600 sgpio support Steven Lee
2021-07-23 9:57 ` Linus Walleij
2021-07-12 10:03 ` [PATCH v6 6/9] gpio: gpio-aspeed-sgpio: Add set_config function Steven Lee
2021-07-23 9:58 ` Linus Walleij
2021-07-12 10:03 ` [PATCH v6 7/9] gpio: gpio-aspeed-sgpio: Move irq_chip to aspeed-sgpio struct Steven Lee
2021-07-23 9:59 ` Linus Walleij
2021-07-12 10:03 ` [PATCH v6 8/9] gpio: gpio-aspeed-sgpio: Use generic device property APIs Steven Lee
2021-07-23 9:59 ` Linus Walleij
2021-07-12 10:03 ` Steven Lee [this message]
2021-07-23 10:00 ` [PATCH v6 9/9] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8 Linus Walleij
2021-07-21 13:27 ` [PATCH v6 0/9] ASPEED sgpio driver enhancement Bartosz Golaszewski
2021-07-23 3:16 ` Steven Lee
2021-07-23 7:30 ` Bartosz Golaszewski
2021-08-03 4:48 ` Andrew Jeffery
2021-08-03 5:57 ` Joel Stanley
2021-08-05 19:17 ` Bartosz Golaszewski
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