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 v5 10/10] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.
Date: Tue, 8 Jun 2021 18:25:45 +0800 [thread overview]
Message-ID: <20210608102547.4880-11-steven_lee@aspeedtech.com> (raw)
In-Reply-To: <20210608102547.4880-1-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>
---
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 f1e40486d401..1a3fcc721664 100644
--- a/drivers/gpio/gpio-aspeed-sgpio.c
+++ b/drivers/gpio/gpio-aspeed-sgpio.c
@@ -572,6 +572,10 @@ static int __init aspeed_sgpio_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Number of GPIOs exceeds the maximum of %d: %d\n",
gpio->max_ngpios, nr_gpios);
return -EINVAL;
+ } else if (nr_gpios % 8) {
+ dev_err(&pdev->dev, "Number of GPIOs not multiple of 8: %d\n",
+ nr_gpios);
+ return -EINVAL;
}
gpio->n_sgpio = nr_gpios;
--
2.17.1
next prev parent reply other threads:[~2021-06-08 10:26 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-08 10:25 [PATCH v5 00/10] ASPEED sgpio driver enhancement Steven Lee
2021-06-08 10:25 ` [PATCH v5 01/10] dt-bindings: aspeed-sgpio: Convert txt bindings to yaml Steven Lee
2021-06-09 0:42 ` Andrew Jeffery
2021-06-10 16:18 ` Rob Herring
2021-06-08 10:25 ` [PATCH v5 02/10] dt-bindings: aspeed-sgpio: Add ast2600 sgpio compatibles Steven Lee
2021-06-10 16:23 ` Rob Herring
2021-06-10 23:27 ` Andrew Jeffery
2021-06-16 15:20 ` Rob Herring
2021-06-08 10:25 ` [PATCH v5 03/10] ARM: dts: aspeed-g6: Add SGPIO node Steven Lee
2021-06-09 0:43 ` Andrew Jeffery
2021-06-09 1:51 ` Steven Lee
2021-06-09 2:19 ` Andrew Jeffery
2021-06-08 10:25 ` [PATCH v5 04/10] ARM: dts: aspeed-g5: Remove ngpios from sgpio node Steven Lee
2021-06-09 0:45 ` Andrew Jeffery
2021-06-08 10:25 ` [PATCH v5 05/10] gpio: gpio-aspeed-sgpio: Add AST2600 sgpio support Steven Lee
2021-06-09 0:52 ` Andrew Jeffery
2021-06-08 10:25 ` [PATCH v5 06/10] gpio: gpio-aspeed-sgpio: Add AST2400 and AST2500 platform data Steven Lee
2021-06-09 0:55 ` Andrew Jeffery
2021-06-09 4:12 ` Steven Lee
2021-06-09 6:45 ` Andrew Jeffery
2021-06-11 19:02 ` Bartosz Golaszewski
2021-06-15 4:22 ` Steven Lee
2021-06-08 10:25 ` [PATCH v5 07/10] gpio: gpio-aspeed-sgpio: Add set_config function Steven Lee
2021-06-08 10:25 ` [PATCH v5 08/10] gpio: gpio-aspeed-sgpio: Move irq_chip to aspeed-sgpio struct Steven Lee
2021-06-08 10:25 ` [PATCH v5 09/10] gpio: gpio-aspeed-sgpio: Use generic device property APIs Steven Lee
2021-06-08 10:25 ` Steven Lee [this message]
2021-06-09 0:56 ` [PATCH v5 10/10] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8 Andrew Jeffery
2021-06-09 10:54 ` [PATCH v5 00/10] ASPEED sgpio driver enhancement Linus Walleij
2021-06-10 2:24 ` Steven Lee
2021-06-10 7:50 ` Linus Walleij
2021-06-10 8:39 ` Steven Lee
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