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iio: adc: at91_adc: allow to use full range of startup time
The DT-Property "atmel,adc-startup-time" is stored in an u8 for a microsecond value. When trying to increase the value of STARTUP in Register AT91_ADC_MR some higher values can't be reached. Change the type in function parameter and private structure field from u8 to u32. Signed-off-by: Jan Leupold <leupold@rsi-elektrotechnik.de> [nicolas.ferre@atmel.com: change commit message, increase u16 to u32 for startup time] Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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1 changed files with 4 additions and 4 deletions
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@ -182,7 +182,7 @@ struct at91_adc_caps {
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u8 ts_pen_detect_sensitivity;
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/* startup time calculate function */
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u32 (*calc_startup_ticks)(u8 startup_time, u32 adc_clk_khz);
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u32 (*calc_startup_ticks)(u32 startup_time, u32 adc_clk_khz);
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u8 num_channels;
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struct at91_adc_reg_desc registers;
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@ -201,7 +201,7 @@ struct at91_adc_state {
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u8 num_channels;
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void __iomem *reg_base;
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struct at91_adc_reg_desc *registers;
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u8 startup_time;
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u32 startup_time;
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u8 sample_hold_time;
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bool sleep_mode;
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struct iio_trigger **trig;
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@ -779,7 +779,7 @@ static int at91_adc_of_get_resolution(struct at91_adc_state *st,
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return ret;
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}
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static u32 calc_startup_ticks_9260(u8 startup_time, u32 adc_clk_khz)
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static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz)
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{
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/*
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* Number of ticks needed to cover the startup time of the ADC
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@ -790,7 +790,7 @@ static u32 calc_startup_ticks_9260(u8 startup_time, u32 adc_clk_khz)
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return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8;
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}
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static u32 calc_startup_ticks_9x5(u8 startup_time, u32 adc_clk_khz)
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static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz)
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{
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/*
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* For sama5d3x and at91sam9x5, the formula changes to:
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