[PATCH 1/1] I2C pxa fast mode (400khz) support

From: Jonathan Cameron <jic23@cam.ac.uk>
To: linux-arm-kernel@lists.arm.linux.org.uk, i2c@lm-sensors.org
Subject: [PATCH 1/1] I2C pxa fast mode (400khz) support
Date: Wed, 02 Jul 2008 16:26:40 +0100	[thread overview]
Message-ID: <486B9E30.80806@cam.ac.uk> (raw)

Add fast_mode option to i2c_pxa_platform_data and use it to set the ICR_FM bit
appropriately when i2c_pxa_reset is called. Parameter called fast_mode rather
than frequency as this driver is also used for the i2c_pxa_pwr bus which has
different normal and fast frequencies.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
---
 drivers/i2c/busses/i2c-pxa.c        |    4 +++-
 include/asm-arm/arch-pxa/i2c.h      |    1 +
 include/asm-arm/arch-pxa/pxa-regs.h |    1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

--- a/include/asm-arm/arch-pxa/pxa-regs.h	2008-06-30 20:06:02.000000000 +0100
+++ b/include/asm-arm/arch-pxa/pxa-regs.h	2008-07-02 14:03:19.000000000 +0100
@@ -448,6 +448,7 @@
 #define ICR_ALDIE	(1 << 12)	   /* enable arbitration interrupt */
 #define ICR_SADIE	(1 << 13)	   /* slave address detected int enable */
 #define ICR_UR		(1 << 14)	   /* unit reset */
+#define ICR_FM		(1 << 15)	   /* fast mode */
 
 #define ISR_RWM		(1 << 0)	   /* read/write mode */
 #define ISR_ACKNAK	(1 << 1)	   /* ack/nak status */
--- a/include/asm-arm/arch-pxa/i2c.h	2008-06-30 20:04:02.000000000 +0100
+++ b/include/asm-arm/arch-pxa/i2c.h	2008-07-02 13:59:59.000000000 +0100
@@ -66,6 +66,7 @@ struct i2c_pxa_platform_data {
 	struct i2c_slave_client	*slave;
 	unsigned int		class;
 	int			use_pio;
+	int			fast_mode;
 };
 
 extern void pxa_set_i2c_info(struct i2c_pxa_platform_data *info);
--- a/drivers/i2c/busses/i2c-pxa.c	2008-06-30 20:05:51.000000000 +0100
+++ b/drivers/i2c/busses/i2c-pxa.c	2008-07-02 15:50:31.000000000 +0100
@@ -67,6 +67,7 @@ struct pxa_i2c {
 
 	int			irq;
 	int			use_pio;
+	int			fast_mode;
 };
 
 #define _IBMR(i2c)	((i2c)->reg_base + 0)
@@ -365,7 +366,7 @@ static void i2c_pxa_reset(struct pxa_i2c
 	writel(i2c->slave_addr, _ISAR(i2c));
 
 	/* set control register values */
-	writel(I2C_ICR_INIT, _ICR(i2c));
+	writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
 
 #ifdef CONFIG_I2C_PXA_SLAVE
 	dev_info(&i2c->adap.dev, "Enabling slave mode\n");
@@ -1041,6 +1042,7 @@ static int i2c_pxa_probe(struct platform
 	if (plat) {
 		i2c->adap.class = plat->class;
 		i2c->use_pio = plat->use_pio;
+		i2c->fast_mode = plat->fast_mode;
 	}
 
 	if (i2c->use_pio) {



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