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i2c-s3c2410: sda_delay should be in ns, not clock ticks

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The sda_delay field should be specified in ns, not in clock ticks
as when using cpufreq we could be changing the bus rate.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
This commit is contained in:
Ben Dooks 2009-03-27 10:52:13 +00:00 committed by Ben Dooks
parent aa11e38ce6
commit a192f7153b
3 changed files with 21 additions and 7 deletions
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2
arch/arm/plat-s3c/dev-i2c0.c
View file

@ -52,7 +52,7 @@ static struct s3c2410_platform_i2c default_i2c_data0 __initdata = {
.slave_addr = 0x10,
.bus_freq = 100*1000,
.max_freq = 400*1000,
.sda_delay = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
.sda_delay = 100,
};
void __init s3c_i2c0_set_platdata(struct s3c2410_platform_i2c *pd)

2
arch/arm/plat-s3c/dev-i2c1.c
View file

@ -49,7 +49,7 @@ static struct s3c2410_platform_i2c default_i2c_data1 __initdata = {
.slave_addr = 0x10,
.bus_freq = 100*1000,
.max_freq = 400*1000,
.sda_delay = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
.sda_delay = 100,
};
void __init s3c_i2c1_set_platdata(struct s3c2410_platform_i2c *pd)

24
drivers/i2c/busses/i2c-s3c2410.c
View file

@ -663,6 +663,23 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
writel(iiccon, i2c->regs + S3C2410_IICCON);
if (s3c24xx_i2c_is2440(i2c)) {
unsigned long sda_delay;
if (pdata->sda_delay) {
sda_delay = (freq / 1000) * pdata->sda_delay;
sda_delay /= 1000000;
sda_delay = DIV_ROUND_UP(sda_delay, 5);
if (sda_delay > 3)
sda_delay = 3;
sda_delay |= S3C2410_IICLC_FILTER_ON;
} else
sda_delay = 0;
dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay);
writel(sda_delay, i2c->regs + S3C2440_IICLC);
}
return 0;
}
@ -769,11 +786,8 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
/* check for s3c2440 i2c controller */
if (s3c24xx_i2c_is2440(i2c)) {
dev_dbg(i2c->dev, "S3C2440_IICLC=%08x\n", pdata->sda_delay);
writel(pdata->sda_delay, i2c->regs + S3C2440_IICLC);
}
if (s3c24xx_i2c_is2440(i2c))
writel(0x0, i2c->regs + S3C2440_IICLC);
return 0;
}