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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-10-07 18:43:04 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-10-07 18:43:04 +0400 |
| commit | a56e74f546b64be93731e42d83baf5b538cc1b11 (patch) | |
| tree | 18f6dee45d801e57ac9db2a31664b0d5c0762c50 /drivers/iio/adc/at91_adc.c | |
| parent | d08e2e09042bd3f7ef66a35cb4bb92794ab26bb2 (diff) | |
| parent | e4e7f10bfc4069925e99cc4b428c3434e30b6c3f (diff) | |
| download | linux-a56e74f546b64be93731e42d83baf5b538cc1b11.tar.xz | |
Merge branch 'arm-aesbs' of git://git.linaro.org/people/ardbiesheuvel/linux-arm into devel-stable
Diffstat (limited to 'drivers/iio/adc/at91_adc.c')
| -rw-r--r-- | drivers/iio/adc/at91_adc.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index 84be63bdf038..0f16b553e063 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -556,7 +556,7 @@ static const struct iio_info at91_adc_info = { static int at91_adc_probe(struct platform_device *pdev) { - unsigned int prsc, mstrclk, ticks, adc_clk, shtim; + unsigned int prsc, mstrclk, ticks, adc_clk, adc_clk_khz, shtim; int ret; struct iio_dev *idev; struct at91_adc_state *st; @@ -649,6 +649,7 @@ static int at91_adc_probe(struct platform_device *pdev) */ mstrclk = clk_get_rate(st->clk); adc_clk = clk_get_rate(st->adc_clk); + adc_clk_khz = adc_clk / 1000; prsc = (mstrclk / (2 * adc_clk)) - 1; if (!st->startup_time) { @@ -662,15 +663,15 @@ static int at91_adc_probe(struct platform_device *pdev) * defined in the electrical characteristics of the board, divided by 8. * The formula thus is : Startup Time = (ticks + 1) * 8 / ADC Clock */ - ticks = round_up((st->startup_time * adc_clk / - 1000000) - 1, 8) / 8; + ticks = round_up((st->startup_time * adc_clk_khz / + 1000) - 1, 8) / 8; /* * a minimal Sample and Hold Time is necessary for the ADC to guarantee * the best converted final value between two channels selection * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock */ - shtim = round_up((st->sample_hold_time * adc_clk / - 1000000) - 1, 1); + shtim = round_up((st->sample_hold_time * adc_clk_khz / + 1000) - 1, 1); reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask; reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask; |