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   1 From 28928a3ce142b2e4e5a7a0f067cefb41a3d2c3f9 Mon Sep 17 00:00:00 2001
   2 From: Krzysztof Kozlowski <krzk@kernel.org>
   3 Date: Sat, 11 Feb 2017 22:14:56 +0200
   4 Subject: ARM: dts: exynos: Do not ignore real-world fuse values for thermal zone 0 on Exynos5420
   5
   6 From: Krzysztof Kozlowski <krzk@kernel.org>
   7
   8 commit 28928a3ce142b2e4e5a7a0f067cefb41a3d2c3f9 upstream.
   9
  10 In Odroid XU3 Lite board, the temperature levels reported for thermal
  11 zone 0 were weird. In warm room:
  12         /sys/class/thermal/thermal_zone0/temp:32000
  13         /sys/class/thermal/thermal_zone1/temp:51000
  14         /sys/class/thermal/thermal_zone2/temp:55000
  15         /sys/class/thermal/thermal_zone3/temp:54000
  16         /sys/class/thermal/thermal_zone4/temp:51000
  17
  18 Sometimes after booting the value was even equal to ambient temperature
  19 which is highly unlikely to be a real temperature of sensor in SoC.
  20
  21 The thermal sensor's calibration (trimming) is based on fused values.
  22 In case of the board above, the fused values are: 35, 52, 43, 58 and 43
  23 (corresponding to each TMU device).  However driver defined a minimum value
  24 for fused data as 40 and for smaller values it was using a hard-coded 55
  25 instead.  This lead to mapping data from sensor to wrong temperatures
  26 for thermal zone 0.
  27
  28 Various vendor 3.10 trees (Hardkernel's based on Samsung LSI, Artik 10)
  29 do not impose any limits on fused values.  Since we do not have any
  30 knowledge about these limits, use 0 as a minimum accepted fused value.
  31 This should essentially allow accepting any reasonable fused value thus
  32 behaving like vendor driver.
  33
  34 The exynos5420-tmu-sensor-conf.dtsi is copied directly from existing
  35 exynos4412 with one change - the samsung,tmu_min_efuse_value.
  36
  37 Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
  38 Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
  39 Acked-by: Eduardo Valentin <edubezval@gmail.com>
  40 Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
  41 Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
  42 Reviewed-by: Anand Moon <linux.amoon@gmail.com>
  43 Tested-by: Anand Moon <linux.amoon@gmail.com>
  44 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  45
  46
  47 ---
  48  arch/arm/boot/dts/exynos5420-tmu-sensor-conf.dtsi |   25 ++++++++++++++++++++++
  49  arch/arm/boot/dts/exynos5420.dtsi                 |   10 ++++----
  50  2 files changed, 30 insertions(+), 5 deletions(-)
  51
  52 --- /dev/null
  53 +++ b/arch/arm/boot/dts/exynos5420-tmu-sensor-conf.dtsi
  54 @@ -0,0 +1,25 @@
  55 +/*
  56 + * Device tree sources for Exynos5420 TMU sensor configuration
  57 + *
  58 + * Copyright (c) 2014 Lukasz Majewski <l.majewski@samsung.com>
  59 + * Copyright (c) 2017 Krzysztof Kozlowski <krzk@kernel.org>
  60 + *
  61 + * This program is free software; you can redistribute it and/or modify
  62 + * it under the terms of the GNU General Public License version 2 as
  63 + * published by the Free Software Foundation.
  64 + *
  65 + */
  66 +
  67 +#include <dt-bindings/thermal/thermal_exynos.h>
  68 +
  69 +#thermal-sensor-cells = <0>;
  70 +samsung,tmu_gain = <8>;
  71 +samsung,tmu_reference_voltage = <16>;
  72 +samsung,tmu_noise_cancel_mode = <4>;
  73 +samsung,tmu_efuse_value = <55>;
  74 +samsung,tmu_min_efuse_value = <0>;
  75 +samsung,tmu_max_efuse_value = <100>;
  76 +samsung,tmu_first_point_trim = <25>;
  77 +samsung,tmu_second_point_trim = <85>;
  78 +samsung,tmu_default_temp_offset = <50>;
  79 +samsung,tmu_cal_type = <TYPE_ONE_POINT_TRIMMING>;
  80 --- a/arch/arm/boot/dts/exynos5420.dtsi
  81 +++ b/arch/arm/boot/dts/exynos5420.dtsi
  82 @@ -694,7 +694,7 @@
  83                         interrupts = <0 65 0>;
  84                         clocks = <&clock CLK_TMU>;
  85                         clock-names = "tmu_apbif";
  86 -                       #include "exynos4412-tmu-sensor-conf.dtsi"
  87 +                       #include "exynos5420-tmu-sensor-conf.dtsi"
  88                 };
  89
  90                 tmu_cpu1: tmu@10064000 {
  91 @@ -703,7 +703,7 @@
  92                         interrupts = <0 183 0>;
  93                         clocks = <&clock CLK_TMU>;
  94                         clock-names = "tmu_apbif";
  95 -                       #include "exynos4412-tmu-sensor-conf.dtsi"
  96 +                       #include "exynos5420-tmu-sensor-conf.dtsi"
  97                 };
  98
  99                 tmu_cpu2: tmu@10068000 {
 100 @@ -712,7 +712,7 @@
 101                         interrupts = <0 184 0>;
 102                         clocks = <&clock CLK_TMU>, <&clock CLK_TMU>;
 103                         clock-names = "tmu_apbif", "tmu_triminfo_apbif";
 104 -                       #include "exynos4412-tmu-sensor-conf.dtsi"
 105 +                       #include "exynos5420-tmu-sensor-conf.dtsi"
 106                 };
 107
 108                 tmu_cpu3: tmu@1006c000 {
 109 @@ -721,7 +721,7 @@
 110                         interrupts = <0 185 0>;
 111                         clocks = <&clock CLK_TMU>, <&clock CLK_TMU_GPU>;
 112                         clock-names = "tmu_apbif", "tmu_triminfo_apbif";
 113 -                       #include "exynos4412-tmu-sensor-conf.dtsi"
 114 +                       #include "exynos5420-tmu-sensor-conf.dtsi"
 115                 };
 116
 117                 tmu_gpu: tmu@100a0000 {
 118 @@ -730,7 +730,7 @@
 119                         interrupts = <0 215 0>;
 120                         clocks = <&clock CLK_TMU_GPU>, <&clock CLK_TMU>;
 121                         clock-names = "tmu_apbif", "tmu_triminfo_apbif";
 122 -                       #include "exynos4412-tmu-sensor-conf.dtsi"
 123 +                       #include "exynos5420-tmu-sensor-conf.dtsi"
 124                 };
 125
 126                 sysmmu_g2dr: sysmmu@0x10A60000 {