From: Stanimir Varbanov Date: Tue, 20 Jan 2015 10:15:21 +0000 (+0200) Subject: DT: iio: vadc: document dt binding X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d3ba5586facfc038110333b5ce17f8bfccbcaddf;p=linux-beck.git DT: iio: vadc: document dt binding Document DT binding for Qualcomm SPMI PMIC voltage ADC driver. Signed-off-by: Stanimir Varbanov Signed-off-by: Ivan T. Ivanov Signed-off-by: Jonathan Cameron --- 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 000000000000..0fb46137f936 --- /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: + Definition: Should contain "qcom,spmi-vadc". + +- reg: + Usage: required + Value type: + Definition: VADC base address and length in the SPMI PMIC register map. + +- #address-cells: + Usage: required + Value type: + Definition: Must be one. Child node 'reg' property should define ADC + channel number. + +- #size-cells: + Usage: required + Value type: + Definition: Must be zero. + +- #io-channel-cells: + Usage: required + Value type: + Definition: Must be one. For details about IIO bindings see: + Documentation/devicetree/bindings/iio/iio-bindings.txt + +- interrupts: + Usage: optional + Value type: + Definition: End of conversion interrupt. + +Channel node properties: + +- reg: + Usage: required + Value type: + Definition: ADC channel number. + See include/dt-bindings/iio/qcom,spmi-vadc.h + +- qcom,decimation: + Usage: optional + Value type: + Definition: This parameter is used to decrease ADC sampling rate. + 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: + 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 on chip will be used. + +- qcom,ratiometric: + Usage: optional + Value type: + 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: + 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: + 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 known as reference point channels, are used for +result calibration and their channel configuration nodes should be defined: +VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV, +VADC_GND_REF and VADC_VDD_VADC. + +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 = ; + 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 000000000000..42121fa238fa --- /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 */