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i2c-s3c2410: Simplify bus frequency calculation

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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>
This commit is contained in:
Daniel Silverstone
2009-03-13 13:53:46 +00:00
committed by Ben Dooks
parent a192f7153b
commit c564e6ae6c
7 changed files with 40 additions and 68 deletions
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5
arch/arm/plat-s3c/dev-i2c0.c
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@@ -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,
};