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Date: Mon, 17 Dec 2018 16:15:02 -0600
From: Rob Herring <robh@...nel.org>
To: Philippe Schenker <dev@...henker.ch>
Cc: jic23@...nel.org, marcel.ziswiler@...adex.com, stefan@...er.ch,
thierry.reding@...il.com,
Max Krummenacher <max.krummenacher@...adex.com>,
Philippe Schenker <philippe.schenker@...adex.com>,
devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
Hartmut Knaack <knaack.h@....de>,
Alexandre Torgue <alexandre.torgue@...com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Lee Jones <lee.jones@...aro.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Mark Rutland <mark.rutland@....com>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org,
Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v4 6/8] iio: adc: add STMPE ADC devicetree bindings
On Wed, Dec 12, 2018 at 02:06:47PM +0100, Philippe Schenker wrote:
> From: Stefan Agner <stefan@...er.ch>
>
> This adds the devicetree bindings for the STMPE ADC. And corrects a
> typo in st,sample-time it is rather "6 -> 124 clocks" according
> to the datasheet and not 144.
>
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>
> Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
> ---
>
> Changes in v4:
> - Put reformatting in a separate precursor patch.
>
> Changes in v3:
> - Reformatted documentation for touchscreen to use tabs and have a better
> overview of the settings.
> - Added note which adc-settings will take precedence.
> - changed typo in sample-time setting from 144 clocks to 124 clocks, as stated
> in the datasheet.
>
> Changes in v2:
> - Moved the bindings for ADC to the overlying mfd.
> - Reformatted for better readability
>
> .../devicetree/bindings/iio/adc/stmpe-adc.txt | 21 ++++++++++++
> .../bindings/input/touchscreen/stmpe.txt | 32 +++++++++----------
> .../devicetree/bindings/mfd/stmpe.txt | 14 ++++++++
> 3 files changed, 51 insertions(+), 16 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> new file mode 100644
> index 000000000000..480e66422625
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> @@ -0,0 +1,21 @@
> +STMPE ADC driver
> +----------------
> +
> +Required properties:
> + - compatible: "st,stmpe-adc"
> +
> +Optional properties:
> +Note that the ADC is shared with the STMPE touchscreen. ADC related settings
> +have to be done in the mfd.
> +- st,norequest-mask: bitmask specifying which ADC channels should _not_ be
> + requestable due to different usage (e.g. touch)
> +
> +Node name must be stmpe_adc and should be child node of stmpe node to
> +which it belongs.
> +
> +Example:
> +
> + stmpe_adc {
> + compatible = "st,stmpe-adc";
> + st,norequest-mask = <0x0F>; /* dont use ADC CH3-0 */
> + };
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> index 1d3f84308142..8e2b240882fa 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> @@ -5,18 +5,6 @@ Required properties:
> - compatible: "st,stmpe-ts"
>
> Optional properties:
> -- st,sample-time : ADC conversion time in number of clock.
> - 0 -> 36 clocks 4 -> 80 clocks (recommended)
> - 1 -> 44 clocks 5 -> 96 clocks
> - 2 -> 56 clocks 6 -> 144 clocks
> - 3 -> 64 clocks
> -- st,mod-12b : ADC Bit mode
> - 0 -> 10bit ADC 1 -> 12bit ADC
> -- st,ref-sel : ADC reference source
> - 0 -> internal 1 -> external
> -- st,adc-freq : ADC Clock speed
> - 0 -> 1.625 MHz 2 || 3 -> 6.5 MHz
> - 1 -> 3.25 MHz
> - st,ave-ctrl : Sample average control
> 0 -> 1 sample
> 1 -> 2 samples
> @@ -40,17 +28,29 @@ Optional properties:
> 0 -> 20 mA (typical 35mA max)
> 1 -> 50 mA (typical 80 mA max)
>
> +Optional properties common with MFD (deprecated):
> + - st,sample-time : ADC conversion time in number of clock.
> + 0 -> 36 clocks 4 -> 80 clocks (recommended)
> + 1 -> 44 clocks 5 -> 96 clocks
> + 2 -> 56 clocks 6 -> 124 clocks
> + 3 -> 64 clocks
> + - st,mod-12b : ADC Bit mode
> + 0 -> 10bit ADC 1 -> 12bit ADC
> + - st,ref-sel : ADC reference source
> + 0 -> internal 1 -> external
> + - st,adc-freq : ADC Clock speed
> + 0 -> 1.625 MHz 2 || 3 -> 6.5 MHz
> + 1 -> 3.25 MHz
> +
> Node name must be stmpe_touchscreen and should be child node of stmpe node to
> which it belongs.
>
> +Note that common ADC settings of stmpe_touchscreen will take precedence.
This isn't clear. The parent or child properties take precedence?
> +
> Example:
>
> stmpe_touchscreen {
> compatible = "st,stmpe-ts";
> - st,sample-time = <4>;
> - st,mod-12b = <1>;
> - st,ref-sel = <0>;
> - st,adc-freq = <1>;
It would be nice to see an example with both ADC and touchscreen.
> st,ave-ctrl = <1>;
> st,touch-det-delay = <2>;
> st,settling = <2>;
> diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
> index a46e7177195d..d4408a417193 100644
> --- a/Documentation/devicetree/bindings/mfd/stmpe.txt
> +++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
> @@ -14,6 +14,20 @@ Optional properties:
> - st,autosleep-timeout : Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
> - irq-gpio : If present, which GPIO to use for event IRQ
>
> +Optional properties for devices with touch and ADC (STMPE811|STMPE610):
> + - st,sample-time : ADC conversion time in number of clock.
> + 0 -> 36 clocks 4 -> 80 clocks (recommended)
> + 1 -> 44 clocks 5 -> 96 clocks
> + 2 -> 56 clocks 6 -> 124 clocks
> + 3 -> 64 clocks
> + - st,mod-12b : ADC Bit mode
> + 0 -> 10bit ADC 1 -> 12bit ADC
> + - st,ref-sel : ADC reference source
> + 0 -> internal 1 -> external
> + - st,adc-freq : ADC Clock speed
> + 0 -> 1.625 MHz 2 || 3 -> 6.5 MHz
> + 1 -> 3.25 MHz
> +
> Example:
>
> stmpe1601: stmpe1601@40 {
> --
> 2.19.2
>
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