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authorDaniel Silverstone <dsilvers@simtec.co.uk>2009-03-13 13:53:46 +0000
committerBen Dooks <ben-linux@fluff.org>2009-04-07 10:18:33 +0100
commitc564e6ae6c5aa6e3995ff87ed4a32b4788ad5109 (patch)
treeb773106104d9897d945709d3bff8a56ff6586da8 /arch
parenta192f7153bb33151f83440cd9c0442233a064bf1 (diff)
i2c-s3c2410: Simplify bus frequency calculation
The platform data for the i2c-s3c2410 driver used to allow a min, max and desired frequency for the I2C bus. This patch reduces it to simply a desired frequency ceiling and corrects all the uses of the platform data appropriately. This means, for example, that on a system with a 66MHz fclk, a request for 100KHz will achieve 65KHz which is safe and acceptable, rather than 378KHz which it would have achieved without this change. Signed-off-by: Simtec Linux Team <linux@simtec.co.uk> Signed-off-by: Daniel Silverstone <dsilvers@simtec.co.uk> [ben-linux@fluff.org: tidy subject and description] Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-s3c2410/mach-bast.c3
-rw-r--r--arch/arm/mach-s3c2410/mach-n30.c3
-rw-r--r--arch/arm/mach-s3c2412/mach-jive.c3
-rw-r--r--arch/arm/plat-s3c/dev-i2c0.c5
-rw-r--r--arch/arm/plat-s3c/dev-i2c1.c5
-rw-r--r--arch/arm/plat-s3c/include/plat/iic.h33
6 files changed, 26 insertions, 26 deletions
diff --git a/arch/arm/mach-s3c2410/mach-bast.c b/arch/arm/mach-s3c2410/mach-bast.c
index 01bd76725b9..4389c160f7d 100644
--- a/arch/arm/mach-s3c2410/mach-bast.c
+++ b/arch/arm/mach-s3c2410/mach-bast.c
@@ -409,8 +409,7 @@ static struct platform_device bast_sio = {
static struct s3c2410_platform_i2c __initdata bast_i2c_info = {
.flags = 0,
.slave_addr = 0x10,
- .bus_freq = 100*1000,
- .max_freq = 130*1000,
+ .frequency = 100*1000,
};
/* Asix AX88796 10/100 ethernet controller */
diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
index 05a5e877b49..2b83f870771 100644
--- a/arch/arm/mach-s3c2410/mach-n30.c
+++ b/arch/arm/mach-s3c2410/mach-n30.c
@@ -340,8 +340,7 @@ static struct platform_device *n35_devices[] __initdata = {
static struct s3c2410_platform_i2c n30_i2ccfg = {
.flags = 0,
.slave_addr = 0x10,
- .bus_freq = 10*1000,
- .max_freq = 10*1000,
+ .frequency = 10*1000,
};
/* Lots of hardcoded stuff, but it sets up the hardware in a useful
diff --git a/arch/arm/mach-s3c2412/mach-jive.c b/arch/arm/mach-s3c2412/mach-jive.c
index 72c266aee14..332bd3263ea 100644
--- a/arch/arm/mach-s3c2412/mach-jive.c
+++ b/arch/arm/mach-s3c2412/mach-jive.c
@@ -453,8 +453,7 @@ static struct spi_board_info __initdata jive_spi_devs[] = {
/* I2C bus and device configuration. */
static struct s3c2410_platform_i2c jive_i2c_cfg __initdata = {
- .max_freq = 80 * 1000,
- .bus_freq = 50 * 1000,
+ .frequency = 80 * 1000,
.flags = S3C_IICFLG_FILTER,
.sda_delay = 2,
};
diff --git a/arch/arm/plat-s3c/dev-i2c0.c b/arch/arm/plat-s3c/dev-i2c0.c
index 8eecb466ab4..428372868fb 100644
--- a/arch/arm/plat-s3c/dev-i2c0.c
+++ b/arch/arm/plat-s3c/dev-i2c0.c
@@ -1,6 +1,6 @@
/* linux/arch/arm/plat-s3c/dev-i2c0.c
*
- * Copyright 2008 Simtec Electronics
+ * Copyright 2008,2009 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
@@ -50,8 +50,7 @@ struct platform_device s3c_device_i2c0 = {
static struct s3c2410_platform_i2c default_i2c_data0 __initdata = {
.flags = 0,
.slave_addr = 0x10,
- .bus_freq = 100*1000,
- .max_freq = 400*1000,
+ .frequency = 100*1000,
.sda_delay = 100,
};
diff --git a/arch/arm/plat-s3c/dev-i2c1.c b/arch/arm/plat-s3c/dev-i2c1.c
index 4536e5bb50e..8349c462788 100644
--- a/arch/arm/plat-s3c/dev-i2c1.c
+++ b/arch/arm/plat-s3c/dev-i2c1.c
@@ -1,6 +1,6 @@
/* linux/arch/arm/plat-s3c/dev-i2c1.c
*
- * Copyright 2008 Simtec Electronics
+ * Copyright 2008,2009 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
@@ -47,8 +47,7 @@ static struct s3c2410_platform_i2c default_i2c_data1 __initdata = {
.flags = 0,
.bus_num = 1,
.slave_addr = 0x10,
- .bus_freq = 100*1000,
- .max_freq = 400*1000,
+ .frequency = 100*1000,
.sda_delay = 100,
};
diff --git a/arch/arm/plat-s3c/include/plat/iic.h b/arch/arm/plat-s3c/include/plat/iic.h
index dc1dfcb9bc6..67450f11574 100644
--- a/arch/arm/plat-s3c/include/plat/iic.h
+++ b/arch/arm/plat-s3c/include/plat/iic.h
@@ -1,9 +1,9 @@
-/* arch/arm/mach-s3c2410/include/mach/iic.h
+/* arch/arm/plat-s3c/include/plat/iic.h
*
- * Copyright (c) 2004 Simtec Electronics
+ * Copyright 2004,2009 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
- * S3C2410 - I2C Controller platfrom_device info
+ * S3C - I2C Controller platform_device info
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -15,19 +15,24 @@
#define S3C_IICFLG_FILTER (1<<0) /* enable s3c2440 filter */
-/* Notes:
- * 1) All frequencies are expressed in Hz
- * 2) A value of zero is `do not care`
-*/
-
+/**
+ * struct s3c2410_platform_i2c - Platform data for s3c I2C.
+ * @bus_num: The bus number to use (if possible).
+ * @flags: Any flags for the I2C bus (E.g. S3C_IICFLK_FILTER).
+ * @slave_addr: The I2C address for the slave device (if enabled).
+ * @frequency: The desired frequency in Hz of the bus. This is
+ * guaranteed to not be exceeded. If the caller does
+ * not care, use zero and the driver will select a
+ * useful default.
+ * @sda_delay: The delay (in ns) applied to SDA edges.
+ * @cfg_gpio: A callback to configure the pins for I2C operation.
+ */
struct s3c2410_platform_i2c {
- int bus_num; /* bus number to use */
+ int bus_num;
unsigned int flags;
- unsigned int slave_addr; /* slave address for controller */
- unsigned long bus_freq; /* standard bus frequency */
- unsigned long max_freq; /* max frequency for the bus */
- unsigned long min_freq; /* min frequency for the bus */
- unsigned int sda_delay; /* pclks (s3c2440 only) */
+ unsigned int slave_addr;
+ unsigned long frequency;
+ unsigned int sda_delay;
void (*cfg_gpio)(struct platform_device *dev);
};