linux-kernel - [PATCH 1/2] i2c: exynos5: add support for HSI2C on Exynos5260 SoC

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Message-id: <1385100726-32165-1-git-send-email-ch.naveen@samsung.com>
Date:	Fri, 22 Nov 2013 11:42:06 +0530
From:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
To:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, hs@...x.de
Cc:	khali@...ux-fr.org, ben-linux@...ff.org, naveenkrishna.ch@...il.com
Subject: [PATCH 1/2] i2c: exynos5: add support for HSI2C on Exynos5260 SoC

This patch adds new compatible to support HSI2C module on Exynos5260
HSI2C module on Exynos5260 needs to be reset during during initialization.

Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
---
 .../devicetree/bindings/i2c/i2c-exynos5.txt        |    6 +++-
 drivers/i2c/busses/i2c-exynos5.c                   |   31 ++++++++++++++++++--
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
index 056732c..704ab92 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
@@ -5,7 +5,11 @@ at various speeds ranging from 100khz to 3.4Mhz.
 
 Required properties:
   - compatible: value should be.
-      -> "samsung,exynos5-hsi2c", for i2c compatible with exynos5 hsi2c.
+	-> "samsung,exynos5-hsi2c", for i2c compatible with HSI2C available on
+				Exynos5250/5420 SoCs.
+	-> "samsung,exynos5260-hsi2c", for i2c compatible with HSI2C available
+				on Exynos5260 SoCs.
+
   - reg: physical base address of the controller and length of memory mapped
     region.
   - interrupts: interrupt number to the cpu.
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index aca3991..cbb49e2 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -184,14 +184,35 @@ struct exynos5_i2c {
 	 * 2. Fast speed upto 1Mbps
 	 */
 	int			speed_mode;
+
+	/* Version of HS-I2C Hardware */
+	unsigned int		version;
+};
+
+enum hsi2c_version {
+	EXYNOS_5,
+	EXYNOS_5260
 };
 
 static const struct of_device_id exynos5_i2c_match[] = {
-	{ .compatible = "samsung,exynos5-hsi2c" },
+	{
+		.compatible = "samsung,exynos5-hsi2c",
+		.data = (void *)EXYNOS_5 },
+	{
+		.compatible = "samsung,exynos5260-hsi2c",
+		.data = (void *)EXYNOS_5260 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, exynos5_i2c_match);
 
+static inline unsigned int exynos5_i2c_get_version(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+
+	match = of_match_node(exynos5_i2c_match, pdev->dev.of_node);
+	return (unsigned int)match->data;
+}
+
 static void exynos5_i2c_clr_pend_irq(struct exynos5_i2c *i2c)
 {
 	writel(readl(i2c->regs + HSI2C_INT_STATUS),
@@ -692,7 +713,13 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_clk;
 
-	exynos5_i2c_init(i2c);
+	i2c->version = exynos5_i2c_get_version(pdev);
+
+	/* The HS-I2C core on Exynos5260 needs a reset to start with */
+	if (i2c->version == EXYNOS_5260)
+		exynos5_i2c_reset(i2c);
+	else
+		exynos5_i2c_init(i2c);
 
 	ret = i2c_add_adapter(&i2c->adap);
 	if (ret < 0) {
-- 
1.7.10.4

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