On 08/06/15 21:07, Stefan Agner wrote: > On 2015-06-08 19:49, Rob Herring wrote: >> On Wed, May 27, 2015 at 7:47 AM, Stefan Agner <stefan@xxxxxxxx> wrote: >>> Support configurable conversion mode through sysfs. So far, the >>> mode used was low-power, which is enabled by default now. Beside >>> that, the modes normal and high-speed are selectable as well. >>> >>> Use the new device tree property which specifies the maximum ADC >>> conversion clock frequencies. Depending on the mode used, the >>> available resulting conversion frequency are calculated >>> dynamically. >>> >>> Acked-by: Fugang Duan <B38611@xxxxxxxxxxxxx> >>> Signed-off-by: Stefan Agner <stefan@xxxxxxxx> >>> --- >>> Documentation/ABI/testing/sysfs-bus-iio-vf610 | 7 + >>> .../devicetree/bindings/iio/adc/vf610-adc.txt | 9 ++ >>> drivers/iio/adc/vf610_adc.c | 146 +++++++++++++++------ >>> 3 files changed, 120 insertions(+), 42 deletions(-) >>> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-vf610 >>> >>> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-vf610 b/Documentation/ABI/testing/sysfs-bus-iio-vf610 >>> new file mode 100644 >>> index 0000000..ecbc1f4 >>> --- /dev/null >>> +++ b/Documentation/ABI/testing/sysfs-bus-iio-vf610 >>> @@ -0,0 +1,7 @@ >>> +What: /sys/bus/iio/devices/iio:deviceX/conversion_mode >>> +KernelVersion: 4.2 >>> +Contact: linux-iio@xxxxxxxxxxxxxxx >>> +Description: >>> + Specifies the hardware conversion mode used. The three >>> + available modes are "normal", "high-speed" and "low-power", >>> + where the last is the default mode. >>> diff --git a/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt b/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt >>> index 1a4a43d..3eb40e2 100644 >>> --- a/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt >>> +++ b/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt >>> @@ -11,6 +11,13 @@ Required properties: >>> - clock-names: Must contain "adc", matching entry in the clocks property. >>> - vref-supply: The regulator supply ADC reference voltage. >>> >>> +Recommended properties: >>> +- fsl,adck-max-frequency: Maximum frequencies according to datasheets operating >>> + requirements. Three values are required, depending on conversion mode: >>> + - Frequency in normal mode (ADLPC=0, ADHSC=0) >>> + - Frequency in high-speed mode (ADLPC=0, ADHSC=1) >>> + - Frequency in low-power mode (ADLPC=1, ADHSC=0) >> >> Why is this "adck" rather than "adc"? > > That is the name of the clock according to the reference manual and data > sheet. > >> How is this related to today's patch adding min-sample-time? > > It is related in that this clock is the base to calculate the sampling > time, but otherwise not really related. Afaik, not respecting the > maximum clock frequency is probably more a issue for the SAR part of the > ADC. Rob, are you happy with Stefan's responses? > > -- > Stefan > > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
