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Message-ID: <545968F5.7070605@gmx.de>
Date: Wed, 05 Nov 2014 01:01:57 +0100
From: Hartmut Knaack <knaack.h@....de>
To: "Ivan T. Ivanov" <iivanov@...sol.com>,
Jonathan Cameron <jic23@...nel.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Kumar Gala <galak@...eaurora.org>
CC: Stanimir Varbanov <svarbanov@...sol.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4 1/2] DT: iio: vadc: document dt binding
Ivan T. Ivanov schrieb am 03.11.2014 16:24:
> From: Stanimir Varbanov <svarbanov@...sol.com>
>
> Document DT binding for Qualcomm SPMI PMIC voltage ADC
> driver.
>
> Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
> .../devicetree/bindings/iio/adc/qcom,spmi-vadc.txt | 129 +++++++++++++++++++++
> include/dt-bindings/iio/qcom,spmi-vadc.h | 119 +++++++++++++++++++
> 2 files changed, 248 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> create mode 100644 include/dt-bindings/iio/qcom,spmi-vadc.h
>
> 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..2253813
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> @@ -0,0 +1,129 @@
> +Qualcomm's SPMI PMIC voltage ADC
> +
> +SPMI PMIC voltage ADC (VADC) provides interface to clients to read
> +voltage. The VADC is a 15-bit sigma-delta ADC.
> +
> +VADC node:
> +
> +- compatible:
> + Usage: required
> + Value type: <string>
> + Definition: Should contain "qcom,spmi-vadc".
> +
> +- reg:
> + Usage: required
> + Value type: <prop-encoded-array>
> + Definition: VADC base address and length in the SPMI PMIC register map.
> +
> +- #address-cells:
> + Usage: required
> + Value type: <u32>
> + Definition: Must be one. Child node 'reg' property should define ADC
> + channel number.
> +
> +- #size-cells:
> + Usage: required
> + Value type: <u32>
> + Definition: Must be zero.
> +
> +- #io-channel-cells:
> + Usage: required
> + Value type: <u32>
> + Definition: Must be one. For details about IIO bindings see:
> + Documentation/devicetree/bindings/iio/iio-bindings.txt
> +
> +- interrupts:
> + Usage: optional
> + Value type: <prop-encoded-array>
> + Definition: End of conversion interrupt.
> +
> +Channel node properties:
> +
> +- reg:
> + Usage: required
> + Value type: <u32>
> + Definition: ADC channel number.
> + See include/dt-bindings/iio/qcom,spmi-vadc.h
> +
> +- qcom,decimation:
> + Usage: optional
> + Value type: <u32>
> + Definition: This parameters is used to decrease ADC sampling rate.
Typo: This parameter (singular)
> + 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 0.625V and 1.25V reference channels, also
> + known as absolute calibration.
> +
> +- 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.
> + 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:
> +
> +Following channels, also know as reference points channels, are used for
Typos: <...> also known as reference point channels <...>
> +result calibration and their channel configuration nodes should be defined:
> +VADC_REF_625MV and/or VADC_SPARE1, based on PMIC version, VADC_REF_1250MV,
Better put the "based on PMIC version" into parenthesis.
> +VADC_GND_REF and VADC_VDD_VADC.
> +
> +Example:
> +
> + /* VADC node */
> + pmic_vadc: vadc@...0 {
> + 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";
> + };
> diff --git a/include/dt-bindings/iio/qcom,spmi-vadc.h b/include/dt-bindings/iio/qcom,spmi-vadc.h
> new file mode 100644
> index 0000000..42121fa
> --- /dev/null
> +++ b/include/dt-bindings/iio/qcom,spmi-vadc.h
> @@ -0,0 +1,119 @@
> +/*
> + * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _DT_BINDINGS_QCOM_SPMI_VADC_H
> +#define _DT_BINDINGS_QCOM_SPMI_VADC_H
> +
> +/* Voltage ADC channels */
> +#define VADC_USBIN 0x00
> +#define VADC_DCIN 0x01
> +#define VADC_VCHG_SNS 0x02
> +#define VADC_SPARE1_03 0x03
> +#define VADC_USB_ID_MV 0x04
> +#define VADC_VCOIN 0x05
> +#define VADC_VBAT_SNS 0x06
> +#define VADC_VSYS 0x07
> +#define VADC_DIE_TEMP 0x08
> +#define VADC_REF_625MV 0x09
> +#define VADC_REF_1250MV 0x0a
> +#define VADC_CHG_TEMP 0x0b
> +#define VADC_SPARE1 0x0c
> +#define VADC_SPARE2 0x0d
> +#define VADC_GND_REF 0x0e
> +#define VADC_VDD_VADC 0x0f
> +
> +#define VADC_P_MUX1_1_1 0x10
> +#define VADC_P_MUX2_1_1 0x11
> +#define VADC_P_MUX3_1_1 0x12
> +#define VADC_P_MUX4_1_1 0x13
> +#define VADC_P_MUX5_1_1 0x14
> +#define VADC_P_MUX6_1_1 0x15
> +#define VADC_P_MUX7_1_1 0x16
> +#define VADC_P_MUX8_1_1 0x17
> +#define VADC_P_MUX9_1_1 0x18
> +#define VADC_P_MUX10_1_1 0x19
> +#define VADC_P_MUX11_1_1 0x1a
> +#define VADC_P_MUX12_1_1 0x1b
> +#define VADC_P_MUX13_1_1 0x1c
> +#define VADC_P_MUX14_1_1 0x1d
> +#define VADC_P_MUX15_1_1 0x1e
> +#define VADC_P_MUX16_1_1 0x1f
> +
> +#define VADC_P_MUX1_1_3 0x20
> +#define VADC_P_MUX2_1_3 0x21
> +#define VADC_P_MUX3_1_3 0x22
> +#define VADC_P_MUX4_1_3 0x23
> +#define VADC_P_MUX5_1_3 0x24
> +#define VADC_P_MUX6_1_3 0x25
> +#define VADC_P_MUX7_1_3 0x26
> +#define VADC_P_MUX8_1_3 0x27
> +#define VADC_P_MUX9_1_3 0x28
> +#define VADC_P_MUX10_1_3 0x29
> +#define VADC_P_MUX11_1_3 0x2a
> +#define VADC_P_MUX12_1_3 0x2b
> +#define VADC_P_MUX13_1_3 0x2c
> +#define VADC_P_MUX14_1_3 0x2d
> +#define VADC_P_MUX15_1_3 0x2e
> +#define VADC_P_MUX16_1_3 0x2f
> +
> +#define VADC_LR_MUX1_BAT_THERM 0x30
> +#define VADC_LR_MUX2_BAT_ID 0x31
> +#define VADC_LR_MUX3_XO_THERM 0x32
> +#define VADC_LR_MUX4_AMUX_THM1 0x33
> +#define VADC_LR_MUX5_AMUX_THM2 0x34
> +#define VADC_LR_MUX6_AMUX_THM3 0x35
> +#define VADC_LR_MUX7_HW_ID 0x36
> +#define VADC_LR_MUX8_AMUX_THM4 0x37
> +#define VADC_LR_MUX9_AMUX_THM5 0x38
> +#define VADC_LR_MUX10_USB_ID 0x39
> +#define VADC_AMUX_PU1 0x3a
> +#define VADC_AMUX_PU2 0x3b
> +#define VADC_LR_MUX3_BUF_XO_THERM 0x3c
> +
> +#define VADC_LR_MUX1_PU1_BAT_THERM 0x70
> +#define VADC_LR_MUX2_PU1_BAT_ID 0x71
> +#define VADC_LR_MUX3_PU1_XO_THERM 0x72
> +#define VADC_LR_MUX4_PU1_AMUX_THM1 0x73
> +#define VADC_LR_MUX5_PU1_AMUX_THM2 0x74
> +#define VADC_LR_MUX6_PU1_AMUX_THM3 0x75
> +#define VADC_LR_MUX7_PU1_AMUX_HW_ID 0x76
> +#define VADC_LR_MUX8_PU1_AMUX_THM4 0x77
> +#define VADC_LR_MUX9_PU1_AMUX_THM5 0x78
> +#define VADC_LR_MUX10_PU1_AMUX_USB_ID 0x79
> +#define VADC_LR_MUX3_BUF_PU1_XO_THERM 0x7c
> +
> +#define VADC_LR_MUX1_PU2_BAT_THERM 0xb0
> +#define VADC_LR_MUX2_PU2_BAT_ID 0xb1
> +#define VADC_LR_MUX3_PU2_XO_THERM 0xb2
> +#define VADC_LR_MUX4_PU2_AMUX_THM1 0xb3
> +#define VADC_LR_MUX5_PU2_AMUX_THM2 0xb4
> +#define VADC_LR_MUX6_PU2_AMUX_THM3 0xb5
> +#define VADC_LR_MUX7_PU2_AMUX_HW_ID 0xb6
> +#define VADC_LR_MUX8_PU2_AMUX_THM4 0xb7
> +#define VADC_LR_MUX9_PU2_AMUX_THM5 0xb8
> +#define VADC_LR_MUX10_PU2_AMUX_USB_ID 0xb9
> +#define VADC_LR_MUX3_BUF_PU2_XO_THERM 0xbc
> +
> +#define VADC_LR_MUX1_PU1_PU2_BAT_THERM 0xf0
> +#define VADC_LR_MUX2_PU1_PU2_BAT_ID 0xf1
> +#define VADC_LR_MUX3_PU1_PU2_XO_THERM 0xf2
> +#define VADC_LR_MUX4_PU1_PU2_AMUX_THM1 0xf3
> +#define VADC_LR_MUX5_PU1_PU2_AMUX_THM2 0xf4
> +#define VADC_LR_MUX6_PU1_PU2_AMUX_THM3 0xf5
> +#define VADC_LR_MUX7_PU1_PU2_AMUX_HW_ID 0xf6
> +#define VADC_LR_MUX8_PU1_PU2_AMUX_THM4 0xf7
> +#define VADC_LR_MUX9_PU1_PU2_AMUX_THM5 0xf8
> +#define VADC_LR_MUX10_PU1_PU2_AMUX_USB_ID 0xf9
> +#define VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM 0xfc
> +
> +#endif /* _DT_BINDINGS_QCOM_SPMI_VADC_H */
>
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