From: Hartmut Knaack <knaack.h@gmx.de>
To: Stanimir Varbanov <svarbanov@mm-sol.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Pawel Moll <pawel.moll@arm.com>, Rob Herring <robh+dt@kernel.org>,
Kumar Gala <galak@codeaurora.org>,
Mark Rutland <mark.rutland@arm.com>,
Grant Likely <grant.likely@linaro.org>,
Jonathan Cameron <jic23@kernel.org>,
Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Angelo Compagnucci <angelo.compagnucci@gmail.com>,
Doug Anderson <dianders@chromium.org>,
Fugang Duan <B38611@freescale.com>,
Johannes Thumshirn <johannes.thumshirn@men.de>,
Jean Delvare <jdelvare@suse.de>,
Philippe Reynes <tremyfr@yahoo.fr>,
Lee Jones <lee.jones@linaro.org>,
Josh Cartwright <joshc@codeaurora.org>,
Stephen Boyd <sboyd@codeaurora.org>,
David Collins <collinsd@codeaurora.org>,
"Ivan T. Ivanov" <iivanov@mm-sol.com>
Subject: Re: [PATCH v2 2/2] DT: iio: vadc: document dt binding
Date: Sat, 13 Sep 2014 01:35:11 +0200 [thread overview]
Message-ID: <5413832F.6040503@gmx.de> (raw)
In-Reply-To: <1410448403-19402-3-git-send-email-svarbanov@mm-sol.com>
Stanimir Varbanov schrieb, Am 11.09.2014 17:13:
> Document DT binding for Qualcomm SPMI PMIC voltage ADC
> driver.
>
Still one typo left.
> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
> Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
> ---
> .../devicetree/bindings/iio/adc/qcom,spmi-vadc.txt | 123 ++++++++++++++++++++
> 1 files changed, 123 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> new file mode 100644
> index 0000000..5abb491
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> @@ -0,0 +1,123 @@
> +Qualcomm's SPMI PMIC voltage ADC
> +
> +SPMI PMIC voltage ADC (VADC) provides interface to clients to read
> +voltage. A 15 bit ADC is used for voltage measurements. There are multiple
> +peripherals to the VADC and the scope of the driver is to provide interface
> +for the USR peripheral of the VADC.
> +
> +VADC node:
> +
> +- compatible:
> + Usage: required
> + Value type: <string>
> + Definition: Should contain "qcom,spmi-vadc".
> +
> +- reg:
> + Usage: required
> + Value type: <u32>
> + Definition: Base address in the SPMI PMIC register map.
> +
> +- address-cells:
> + Usage: required
> + Value type: <u32>
> + Definition: Must be one.
> +
> +- size-cells:
> + Usage: required
> + Value type: <u32>
> + Definition: Must be zero.
> +
> +- interrupts:
> + Usage: required
> + Value type: <prop-encoded-array>
> + Definition: End of convertion interrupt number.
Typo: conversion
> +
> +- qcom,poll-eoc:
> + Usage: optional
> + Value type: <empty>
> + Definition: Use polling instead of interrupt for end of conversion
> + completion.
> +
> +Channel node properties:
> +
> +- reg:
> + Usage: required
> + Value type: <u32>
> + Definition: AMUX channel number.
> + See include/dt-bindings/iio/qcom,spmi-pmic-vadc.h
> +
> +- qcom,decimation:
> + Usage: optional
> + Value type: <u32>
> + Definition: Sampling rate to use for the individual channel measurement.
> + Quicker measurements can be made by reducing decimation ratio.
> + Valid values are 512, 1024, 2048, 4096.
> + If property is not found, default value of 512 will be used.
> +
> +- qcom,pre-scaling:
> + Usage: optional
> + Value type: <u32 array>
> + Definition: Used for scaling the channel input signal before the signal is
> + fed to VADC. The configuration for this node is to know the
> + pre-determined ratio and use it for post scaling. Select one from
> + the following options.
> + <1 1>, <1 3>, <1 4>, <1 6>, <1 20>, <1 8>, <10 81>, <1 10>
> + If property is not found default value depending of chip will be used.
> +
> +- qcom,ratiometric:
> + Usage: optional
> + Value type: <empty>
> + Definition: Channel calibration type. If this property is specified
> + VADC will use the VDD reference(1.8V) and GND for channel
> + calibration. If property is not found, channel will be
> + calibrated with 625mV and 1.25V reference channels.
> +
> +- qcom,hw-settle-time:
> + Usage: optional
> + Value type: <u32>
> + Definition: Time between AMUX getting configured and the ADC starting
> + conversion. Delay = 100us * (value) for value < 11, and
> + 2ms * (value - 10) otherwise.
> + Valid values are: 0, 100, 200, 300, 400, 500, 600, 700, 800,
> + 900 us and 1, 2, 4, 6, 8, 10 ms
> + If property is not found, channel will use 0us.
> +
> +- qcom,avg-samples:
> + Usage: optional
> + Value type: <u32>
> + Definition: Number of samples to be used for measurement.
> + Fast averaging provides the option to obtain a single measurement
> + from the ADC that is an average of multiple samples. The value
> + selected is 2^(value).
> + Valid values are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512
> + If property is not found, 1 sample will be used.
> +
> +NOTE: At least one channel node is required.
> +
> +Example:
> + /* VADC node */
> + pmic_vadc: vadc@3100 {
> + compatible = "qcom,spmi-vadc";
> + reg = <0x3100 0x100>;
> + interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + #io-channel-cells = <1>;
> + io-channel-ranges;
> +
> + /* Channel node */
> + usb_id_nopull {
> + reg = <VADC_LR_MUX10_USB_ID>;
> + qcom,decimation = <512>;
> + qcom,ratiometric;
> + qcom,hw-settle-time = <200>;
> + qcom,avg-samples = <1>;
> + qcom,pre-scaling = <1 3>;
> + };
> + };
> +
> + /* IIO client node */
> + usb {
> + io-channels = <&pmic_vadc VADC_LR_MUX10_USB_ID>;
> + io-channel-names = "vadc";
> + };
>
next prev parent reply other threads:[~2014-09-12 23:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 15:13 [PATCH v2 0/2] Intial support for voltage ADC Stanimir Varbanov
2014-09-11 15:13 ` [PATCH v2 1/2] iio: vadc: Qualcomm SPMI PMIC voltage ADC driver Stanimir Varbanov
2014-09-12 23:27 ` Hartmut Knaack
2014-09-13 17:27 ` Jonathan Cameron
2014-09-15 14:12 ` Stanimir Varbanov
2014-09-15 16:11 ` Jonathan Cameron
2014-09-18 9:57 ` Stanimir Varbanov
2014-09-21 13:29 ` Jonathan Cameron
2014-09-22 1:01 ` Kim, Milo
2014-09-15 14:16 ` Stanimir Varbanov
2014-09-11 15:13 ` [PATCH v2 2/2] DT: iio: vadc: document dt binding Stanimir Varbanov
2014-09-12 23:35 ` Hartmut Knaack [this message]
2014-09-13 17:32 ` Jonathan Cameron
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