linux-kernel - [PATCH V3 3/5] spi: s3c64xx: Added provision for non-gpio i/o's

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Date:	Wed, 13 Mar 2013 12:13:32 +0530
From:	Girish K S <girishks2000@...il.com>
To:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	grant.likely@...retlab.ca, t.figa@...sung.com,
	broonie@...nsource.wolfsonmicro.com,
	Girish K S <girishks2000@...il.com>
Subject: [PATCH V3 3/5] spi: s3c64xx: Added provision for non-gpio i/o's

From: Girish K S <girishks2000@...il.com>

Currently the drivers supports only the GPIO based i/o pins.
But there are Exynos SoC's that use the same controller with
dedicated i/o pins.

This patch  provides provision to support gpio/dedicated pins.
The decision is made by parsing the "gpios" property in the spi
node.

Signed-off-by: Girish K S <ks.giri@...sung.com>
---
 drivers/spi/spi-s3c64xx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 054b8d4..94716d1 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1112,6 +1112,9 @@ static int s3c64xx_spi_parse_dt_gpio(struct s3c64xx_spi_driver_data *sdd)
 	struct device *dev = &sdd->pdev->dev;
 	int idx, gpio, ret;
 
+	if (!of_find_property(dev->of_node, "gpios", NULL))
+		return 0;
+
 	/* find gpios for mosi, miso and clock lines */
 	for (idx = 0; idx < 3; idx++) {
 		gpio = of_get_gpio(dev->of_node, idx);
@@ -1138,6 +1141,11 @@ free_gpio:
 static void s3c64xx_spi_dt_gpio_free(struct s3c64xx_spi_driver_data *sdd)
 {
 	unsigned int idx;
+	struct device *dev = &sdd->pdev->dev;
+
+	if (!of_find_property(dev->of_node, "gpios", NULL))
+		return;
+
 	for (idx = 0; idx < 3; idx++)
 		gpio_free(sdd->gpios[idx]);
 }
-- 
1.8.0

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