[PATCH] ARM: 2832/1: BAST - limit clock-rate for IIC bus
Patch from Ben Dooks The default clock rate does not specify a maximum, so the default of 400KHz is used. This rate is too fast for the PMU on the EB2410ITX, so we now specify platform data with a rate of around 100KHz. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -30,6 +30,7 @@
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* 28-Jun-2005 BJD Moved pm functionality out to common code
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* 17-Jul-2005 BJD Changed to platform device for SuperIO 16550s
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* 25-Jul-2005 BJD Removed ASIX static mappings
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* 27-Jul-2005 BJD Ensure maximum frequency of i2c bus
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*/
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#include <linux/kernel.h>
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@ -60,6 +61,7 @@
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#include <asm/arch/regs-mem.h>
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#include <asm/arch/regs-lcd.h>
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#include <asm/arch/nand.h>
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#include <asm/arch/iic.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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@ -304,7 +306,7 @@ static void bast_nand_select(struct s3c2410_nand_set *set, int slot)
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}
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static struct s3c2410_platform_nand bast_nand_info = {
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.tacls = 80,
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.tacls = 40,
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.twrph0 = 80,
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.twrph1 = 80,
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.nr_sets = ARRAY_SIZE(bast_nand_sets),
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@ -385,6 +387,17 @@ static struct platform_device bast_sio = {
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},
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};
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/* we have devices on the bus which cannot work much over the
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* standard 100KHz i2c bus frequency
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*/
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static struct s3c2410_platform_i2c bast_i2c_info = {
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.flags = 0,
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.slave_addr = 0x10,
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.bus_freq = 100*1000,
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.max_freq = 130*1000,
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};
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/* Standard BAST devices */
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static struct platform_device *bast_devices[] __initdata = {
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@ -431,6 +444,7 @@ void __init bast_map_io(void)
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s3c24xx_uclk.parent = &s3c24xx_clkout1;
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s3c_device_nand.dev.platform_data = &bast_nand_info;
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s3c_device_i2c.dev.platform_data = &bast_i2c_info;
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s3c24xx_init_io(bast_iodesc, ARRAY_SIZE(bast_iodesc));
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s3c24xx_init_clocks(0);
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