The dra7xx series of SOCs contain a temperature sensor and an associated analog-to-digital converter (ADC) which produces an output which is proportional to the SOC temperature. Add support for this temperature sensor. Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org>master
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* Texas Instrument dra7xx SCM bandgap bindings |
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In the System Control Module, SoC supplies a voltage reference |
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and a temperature sensor feature that are gathered in the band |
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gap voltage and temperature sensor (VBGAPTS) module. The band |
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gap provides current and voltage reference for its internal |
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circuits and other analog IP blocks. The analog-to-digital |
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converter (ADC) produces an output value that is proportional |
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to the silicon temperature. |
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Required properties: |
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- compatible : Should be: |
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- "ti,dra752-bandgap" |
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- interrupts : this entry should indicate which interrupt line |
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the talert signal is routed to; |
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- regs : this is specific to each bandgap version, because |
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the mapping may change from soc to soc, apart from depending |
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on available features. |
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Optional: |
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- gpios : this entry should be used to inform which GPIO |
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line the tshut signal is routed to. The informed GPIO will |
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be treated as an IRQ; |
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Example: |
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bandgap { |
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reg = <0x4a0021e0 0xc |
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0x4a00232c 0xc |
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0x4a002380 0x2c |
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0x4a0023C0 0x3c |
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0x4a002564 0x8 |
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0x4a002574 0x50>; |
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compatible = "ti,dra752-bandgap"; |
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interrupts = <0 126 4>; /* talert */ |
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}; |
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/*
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* TI Bandgap temperature sensor driver |
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* |
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* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation version 2. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* Taken from Linux v4.9 (drivers/thermal/ti-soc-thermal/ti-bandgap.c) |
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* and ported to uboot. |
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* |
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*/ |
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#include <asm/io.h> |
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#include <dm.h> |
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#include <thermal.h> |
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#define CTRL_CORE_TEMP_SENSOR_MPU 0 |
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#define DRA752_ADC_START_VALUE 540 |
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struct ti_bandgap { |
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ulong base; |
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int temperature; /* in mili degree celsius */ |
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}; |
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/*
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* DRA752 : Temperature values in milli degree celsius |
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* ADC code values from 540 to 945 |
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*/ |
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static int dra752_adc_to_temp[] = { |
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/* Index 540 - 549 */ |
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-40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200, |
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-37800, |
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/* Index 550 - 559 */ |
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-37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200, -33800, |
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-33400, |
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/* Index 560 - 569 */ |
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-33000, -32600, -32200, -31800, -31400, -31000, -30600, -30200, -29800, |
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-29400, |
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/* Index 570 - 579 */ |
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-29000, -28600, -28200, -27700, -27100, -26600, -26200, -25800, -25400, |
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-25000, |
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/* Index 580 - 589 */ |
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-24600, -24200, -23800, -23400, -23000, -22600, -22200, -21800, -21400, |
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-21000, |
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/* Index 590 - 599 */ |
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-20500, -19900, -19400, -19000, -18600, -18200, -17800, -17400, -17000, |
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-16600, |
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/* Index 600 - 609 */ |
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-16200, -15800, -15400, -15000, -14600, -14200, -13800, -13400, -13000, |
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-12500, |
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/* Index 610 - 619 */ |
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-11900, -11400, -11000, -10600, -10200, -9800, -9400, -9000, -8600, |
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-8200, |
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/* Index 620 - 629 */ |
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-7800, -7400, -7000, -6600, -6200, -5800, -5400, -5000, -4500, |
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-3900, |
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/* Index 630 - 639 */ |
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-3400, -3000, -2600, -2200, -1800, -1400, -1000, -600, -200, |
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200, |
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/* Index 640 - 649 */ |
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600, 1000, 1400, 1800, 2200, 2600, 3000, 3400, 3900, |
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4500, |
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/* Index 650 - 659 */ |
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5000, 5400, 5800, 6200, 6600, 7000, 7400, 7800, 8200, |
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8600, |
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/* Index 660 - 669 */ |
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9000, 9400, 9800, 10200, 10600, 11000, 11400, 11800, 12200, |
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12700, |
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/* Index 670 - 679 */ |
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13300, 13800, 14200, 14600, 15000, 15400, 15800, 16200, 16600, |
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17000, |
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/* Index 680 - 689 */ |
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17400, 17800, 18200, 18600, 19000, 19400, 19800, 20200, 20600, |
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21000, |
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/* Index 690 - 699 */ |
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21400, 21900, 22500, 23000, 23400, 23800, 24200, 24600, 25000, |
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25400, |
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/* Index 700 - 709 */ |
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25800, 26200, 26600, 27000, 27400, 27800, 28200, 28600, 29000, |
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29400, |
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/* Index 710 - 719 */ |
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29800, 30200, 30600, 31000, 31400, 31900, 32500, 33000, 33400, |
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33800, |
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/* Index 720 - 729 */ |
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34200, 34600, 35000, 35400, 35800, 36200, 36600, 37000, 37400, |
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37800, |
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/* Index 730 - 739 */ |
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38200, 38600, 39000, 39400, 39800, 40200, 40600, 41000, 41400, |
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41800, |
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/* Index 740 - 749 */ |
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42200, 42600, 43100, 43700, 44200, 44600, 45000, 45400, 45800, |
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46200, |
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/* Index 750 - 759 */ |
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46600, 47000, 47400, 47800, 48200, 48600, 49000, 49400, 49800, |
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50200, |
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/* Index 760 - 769 */ |
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50600, 51000, 51400, 51800, 52200, 52600, 53000, 53400, 53800, |
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54200, |
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/* Index 770 - 779 */ |
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54600, 55000, 55400, 55900, 56500, 57000, 57400, 57800, 58200, |
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58600, |
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/* Index 780 - 789 */ |
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59000, 59400, 59800, 60200, 60600, 61000, 61400, 61800, 62200, |
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62600, |
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/* Index 790 - 799 */ |
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63000, 63400, 63800, 64200, 64600, 65000, 65400, 65800, 66200, |
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66600, |
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/* Index 800 - 809 */ |
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67000, 67400, 67800, 68200, 68600, 69000, 69400, 69800, 70200, |
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70600, |
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/* Index 810 - 819 */ |
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71000, 71500, 72100, 72600, 73000, 73400, 73800, 74200, 74600, |
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75000, |
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/* Index 820 - 829 */ |
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75400, 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, |
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79000, |
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/* Index 830 - 839 */ |
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79400, 79800, 80200, 80600, 81000, 81400, 81800, 82200, 82600, |
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83000, |
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/* Index 840 - 849 */ |
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83400, 83800, 84200, 84600, 85000, 85400, 85800, 86200, 86600, |
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87000, |
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/* Index 850 - 859 */ |
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87400, 87800, 88200, 88600, 89000, 89400, 89800, 90200, 90600, |
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91000, |
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/* Index 860 - 869 */ |
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91400, 91800, 92200, 92600, 93000, 93400, 93800, 94200, 94600, |
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95000, |
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/* Index 870 - 879 */ |
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95400, 95800, 96200, 96600, 97000, 97500, 98100, 98600, 99000, |
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99400, |
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/* Index 880 - 889 */ |
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99800, 100200, 100600, 101000, 101400, 101800, 102200, 102600, 103000, |
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103400, |
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/* Index 890 - 899 */ |
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103800, 104200, 104600, 105000, 105400, 105800, 106200, 106600, 107000, |
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107400, |
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/* Index 900 - 909 */ |
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107800, 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000, |
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111400, |
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/* Index 910 - 919 */ |
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111800, 112200, 112600, 113000, 113400, 113800, 114200, 114600, 115000, |
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115400, |
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/* Index 920 - 929 */ |
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115800, 116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, |
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119400, |
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/* Index 930 - 939 */ |
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119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000, |
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123400, |
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/* Index 940 - 945 */ |
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123800, 124200, 124600, 124900, 125000, 125000, |
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}; |
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static int ti_bandgap_get_temp(struct udevice *dev, int *temp) |
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{ |
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struct ti_bandgap *bgp = dev_get_priv(dev); |
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bgp->temperature = 0x3ff & readl(bgp->base + CTRL_CORE_TEMP_SENSOR_MPU); |
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*temp = dra752_adc_to_temp[bgp->temperature - DRA752_ADC_START_VALUE]; |
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return 0; |
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} |
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static struct dm_thermal_ops ti_thermal_ops = { |
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.get_temp = ti_bandgap_get_temp, |
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}; |
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static int ti_bandgap_probe(struct udevice *dev) |
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{ |
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struct ti_bandgap *bgp = dev_get_priv(dev); |
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bgp->base = devfdt_get_addr_index(dev, 1); |
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return 0; |
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} |
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static const struct udevice_id of_ti_bandgap_match[] = { |
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{ |
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.compatible = "ti,dra752-bandgap", |
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}, |
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{}, |
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}; |
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U_BOOT_DRIVER(ti_bandgap_thermal) = { |
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.name = "ti_bandgap_thermal", |
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.id = UCLASS_THERMAL, |
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.ops = &ti_thermal_ops, |
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.probe = ti_bandgap_probe, |
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.of_match = of_ti_bandgap_match, |
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.priv_auto_alloc_size = sizeof(struct ti_bandgap), |
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}; |
Loading…
Reference in new issue