Messages in this thread | | | Date | Sat, 22 Mar 2014 12:34:00 +0000 | From | Jonathan Cameron <> | Subject | Re: [PATCH v2 05/15] ARM: at91: sam9m10g45ek: Add touchscreen support through at91_adc |
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On 17/03/14 13:56, Alexandre Belloni wrote: > at91_adc now supports reading a touchscreen for ADCs without a TSMR register. > Enable touchscreen support through at91_adc. This allows to use both a > touchscreen and the remaining ADC channel at the same time. > > Also, lower the clock for the ADC as it allows to have more stable reads and > this is the speed used by atmel_tsadcc. > It lowers the maximum throughput rate from 440000 samples per second to 12958 > samples per second. It shouldn't be an issue as the CPU is not able to keep up > reading samples at that frequency. Thanks for adding this detail. > > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Jonathan Cameron <jic23@kernel.org> > --- > arch/arm/mach-at91/at91sam9g45.c | 2 +- > arch/arm/mach-at91/board-sam9m10g45ek.c | 1 + > 2 files changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/mach-at91/at91sam9g45.c b/arch/arm/mach-at91/at91sam9g45.c > index 2f455ce35268..3c519a7a938f 100644 > --- a/arch/arm/mach-at91/at91sam9g45.c > +++ b/arch/arm/mach-at91/at91sam9g45.c > @@ -181,7 +181,7 @@ static struct clk vdec_clk = { > static struct clk adc_op_clk = { > .name = "adc_op_clk", > .type = CLK_TYPE_PERIPHERAL, > - .rate_hz = 13200000, > + .rate_hz = 300000, > }; > > /* AES/TDES/SHA clock - Only for sam9m11/sam9g56 */ > diff --git a/arch/arm/mach-at91/board-sam9m10g45ek.c b/arch/arm/mach-at91/board-sam9m10g45ek.c > index ef39078c8ce2..4d775b796ce4 100644 > --- a/arch/arm/mach-at91/board-sam9m10g45ek.c > +++ b/arch/arm/mach-at91/board-sam9m10g45ek.c > @@ -315,6 +315,7 @@ static struct at91_adc_data ek_adc_data = { > .channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) | BIT(6) | BIT(7), > .use_external_triggers = true, > .vref = 3300, > + .touchscreen_type = ATMEL_ADC_TOUCHSCREEN_4WIRE, > }; > > /* >
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