* [PATCH v5 1/3] iio: hx711: add clock-frequency property in DT
@ 2018-07-10 18:18 Andreas Klinger
2018-07-11 13:54 ` Rob Herring
0 siblings, 1 reply; 3+ messages in thread
From: Andreas Klinger @ 2018-07-10 18:18 UTC (permalink / raw)
To: jic23, knaack.h, lars, pmeerw, robh+dt, mark.rutland, mchehab,
davem, gregkh, akpm, linus.walleij, rdunlap, devicetree,
linux-iio, linux-kernel
Add clock-frequency property for hx711 ADC. This is the frequency of
PD_SCK.
After PD_SCK goes high DOUT is read just before PD_SCK goes down again.
This is necessary because of parasitic capacitance on the wiring.
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
---
Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt b/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
index b3629405f568..2c1b67d33c49 100644
--- a/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
+++ b/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
@@ -8,11 +8,17 @@ Required properties:
See Documentation/devicetree/bindings/gpio/gpio.txt
- avdd-supply: Definition of the regulator used as analog supply
+Optional properties:
+ - clock-frequency: Frequency of PD_SCK in Hz
+ Minimum value allowed is 10 kHz because of maximum
+ high time of 50 microseconds.
+
Example:
weight@0 {
compatible = "avia,hx711";
sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;
dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
avdd-suppy = <&avdd>;
+ clock-frequency = <100000>;
};
--
2.1.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v5 1/3] iio: hx711: add clock-frequency property in DT
2018-07-10 18:18 [PATCH v5 1/3] iio: hx711: add clock-frequency property in DT Andreas Klinger
@ 2018-07-11 13:54 ` Rob Herring
2018-07-15 8:38 ` Jonathan Cameron
0 siblings, 1 reply; 3+ messages in thread
From: Rob Herring @ 2018-07-11 13:54 UTC (permalink / raw)
To: Andreas Klinger
Cc: jic23, knaack.h, lars, pmeerw, mark.rutland, mchehab, davem,
gregkh, akpm, linus.walleij, rdunlap, devicetree, linux-iio,
linux-kernel
On Tue, Jul 10, 2018 at 08:18:31PM +0200, Andreas Klinger wrote:
> Add clock-frequency property for hx711 ADC. This is the frequency of
> PD_SCK.
>
> After PD_SCK goes high DOUT is read just before PD_SCK goes down again.
> This is necessary because of parasitic capacitance on the wiring.
>
> Signed-off-by: Andreas Klinger <ak@it-klinger.de>
> ---
> Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 6 ++++++
> 1 file changed, 6 insertions(+)
Reviewed-by: Rob Herring <robh@kernel.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v5 1/3] iio: hx711: add clock-frequency property in DT
2018-07-11 13:54 ` Rob Herring
@ 2018-07-15 8:38 ` Jonathan Cameron
0 siblings, 0 replies; 3+ messages in thread
From: Jonathan Cameron @ 2018-07-15 8:38 UTC (permalink / raw)
To: Rob Herring
Cc: Andreas Klinger, knaack.h, lars, pmeerw, mark.rutland, mchehab,
davem, gregkh, akpm, linus.walleij, rdunlap, devicetree,
linux-iio, linux-kernel
On Wed, 11 Jul 2018 07:54:00 -0600
Rob Herring <robh@kernel.org> wrote:
> On Tue, Jul 10, 2018 at 08:18:31PM +0200, Andreas Klinger wrote:
> > Add clock-frequency property for hx711 ADC. This is the frequency of
> > PD_SCK.
> >
> > After PD_SCK goes high DOUT is read just before PD_SCK goes down again.
> > This is necessary because of parasitic capacitance on the wiring.
> >
> > Signed-off-by: Andreas Klinger <ak@it-klinger.de>
> > ---
> > Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 6 ++++++
> > 1 file changed, 6 insertions(+)
>
> Reviewed-by: Rob Herring <robh@kernel.org>
Applied to the togreg branch of iio.git and pushed out as testing.
Thanks,
Jonathan
> --
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