linux-kernel - [PATCH 1/2] gpio: mcp23s08: Allow -1 as a legal value for global gpio base

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Message-Id: <1360170118-11937-2-git-send-email-larsi@wh2.tu-dresden.de>
Date:	Wed,  6 Feb 2013 18:01:57 +0100
From:	Lars Poeschel <larsi@....tu-dresden.de>
To:	poeschel@...onage.de, grant.likely@...retlab.ca,
	rob.herring@...xeda.com, rob@...dley.net, linus.walleij@...aro.org,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Cc:	w.sang@...gutronix.de, ben-linux@...ff.org,
	linux-i2c@...r.kernel.org
Subject: [PATCH 1/2] gpio: mcp23s08: Allow -1 as a legal value for global gpio base

From: Lars Poeschel <poeschel@...onage.de>

Explicitly allow -1 as a legal value for the
mcp23s08_platform_data->base. This is the special value lets the
kernel choose a valid global gpio base number.

Signed-off-by: Lars Poeschel <poeschel@...onage.de>
---
 drivers/gpio/gpio-mcp23s08.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 3cea0ea..2afb828 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -483,7 +483,7 @@ static int mcp230xx_probe(struct i2c_client *client,
 	int status;
 
 	pdata = client->dev.platform_data;
-	if (!pdata || !gpio_is_valid(pdata->base)) {
+	if ((!pdata || !gpio_is_valid(pdata->base)) && pdata->base != -1) {
 		dev_dbg(&client->dev, "invalid or missing platform data\n");
 		return -EINVAL;
 	}
@@ -570,7 +570,7 @@ static int mcp23s08_probe(struct spi_device *spi)
 	type = spi_get_device_id(spi)->driver_data;
 
 	pdata = spi->dev.platform_data;
-	if (!pdata || !gpio_is_valid(pdata->base)) {
+	if ((!pdata || !gpio_is_valid(pdata->base)) && pdata->base != -1) {
 		dev_dbg(&spi->dev, "invalid or missing platform data\n");
 		return -EINVAL;
 	}
-- 
1.7.10.4

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