From c3cef3f3c07bb98e023e4d5441e60538516a4741 Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Mon, 20 Aug 2007 10:19:10 +0100
Subject: [PATCH] [ARM] pxa: update pxa i2c driver to use clk support

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/i2c/busses/i2c-pxa.c | 45 ++++++++++++++++++++----------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index bb5466b27b59..00fad11733ad 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -31,6 +31,8 @@
 #include <linux/interrupt.h>
 #include <linux/i2c-pxa.h>
 #include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/clk.h>
 
 #include <asm/hardware.h>
 #include <asm/irq.h>
@@ -48,6 +50,7 @@ struct pxa_i2c {
 	unsigned int		slave_addr;
 
 	struct i2c_adapter	adap;
+	struct clk		*clk;
 #ifdef CONFIG_I2C_PXA_SLAVE
 	struct i2c_slave_client *slave;
 #endif
@@ -869,6 +872,12 @@ static int i2c_pxa_probe(struct platform_device *dev)
 
 	sprintf(i2c->adap.name, "pxa_i2c-i2c.%u", dev->id);
 
+	i2c->clk = clk_get(&dev->dev, "I2CCLK");
+	if (IS_ERR(i2c->clk)) {
+		ret = PTR_ERR(i2c->clk);
+		goto eclk;
+	}
+
 	i2c->reg_base = ioremap(res->start, res_len(res));
 	if (!i2c->reg_base) {
 		ret = -EIO;
@@ -889,22 +898,19 @@ static int i2c_pxa_probe(struct platform_device *dev)
 	}
 #endif
 
+	clk_enable(i2c->clk);
+#ifdef CONFIG_PXA27x
 	switch (dev->id) {
 	case 0:
-#ifdef CONFIG_PXA27x
 		pxa_gpio_mode(GPIO117_I2CSCL_MD);
 		pxa_gpio_mode(GPIO118_I2CSDA_MD);
-#endif
-		pxa_set_cken(CKEN_I2C, 1);
 		break;
-#ifdef CONFIG_PXA27x
 	case 1:
 		local_irq_disable();
 		PCFR |= PCFR_PI2CEN;
 		local_irq_enable();
-		pxa_set_cken(CKEN_PWRI2C, 1);
-#endif
 	}
+#endif
 
 	ret = request_irq(irq, i2c_pxa_handler, IRQF_DISABLED,
 			  i2c->adap.name, i2c);
@@ -948,19 +954,18 @@ static int i2c_pxa_probe(struct platform_device *dev)
 eadapt:
 	free_irq(irq, i2c);
 ereqirq:
-	switch (dev->id) {
-	case 0:
-		pxa_set_cken(CKEN_I2C, 0);
-		break;
+	clk_disable(i2c->clk);
+
 #ifdef CONFIG_PXA27x
-	case 1:
-		pxa_set_cken(CKEN_PWRI2C, 0);
+	if (dev->id == 1) {
 		local_irq_disable();
 		PCFR &= ~PCFR_PI2CEN;
 		local_irq_enable();
-#endif
 	}
+#endif
 eremap:
+	clk_put(i2c->clk);
+eclk:
 	kfree(i2c);
 emalloc:
 	release_mem_region(res->start, res_len(res));
@@ -975,18 +980,18 @@ static int i2c_pxa_remove(struct platform_device *dev)
 
 	i2c_del_adapter(&i2c->adap);
 	free_irq(i2c->irq, i2c);
-	switch (dev->id) {
-	case 0:
-		pxa_set_cken(CKEN_I2C, 0);
-		break;
+
+	clk_disable(i2c->clk);
+	clk_put(i2c->clk);
+
 #ifdef CONFIG_PXA27x
-	case 1:
-		pxa_set_cken(CKEN_PWRI2C, 0);
+	if (dev->id == 1) {
 		local_irq_disable();
 		PCFR &= ~PCFR_PI2CEN;
 		local_irq_enable();
-#endif
 	}
+#endif
+
 	release_mem_region(i2c->iobase, i2c->iosize);
 	kfree(i2c);