target/linux/gemini/patches-5.4/0004-ARM-dts-gemini-Add-thermal-zone-to-DIR-685.patch

   1 From 2b2e9d0e1ee4765b21c648235489028c6dc7e336 Mon Sep 17 00:00:00 2001
   2 From: Linus Walleij <linus.walleij@linaro.org>
   3 Date: Tue, 31 Dec 2019 18:18:08 +0100
   4 Subject: [PATCH 4/7] ARM: dts: gemini: Add thermal zone to DIR-685
   5
   6 The DIR-685 can now exploit the thermal zone added by the
   7 drive temperature sensor inside the hard drive. We have
   8 patched the libata subsystem to assign the device nodes
   9 properly to the SCSI devices and this is what the drivetemp
  10 driver will use to populate the sensor and the thermal
  11 zone, so pick that up into the thermal zone and let this
  12 control the fan.
  13
  14 The hardware lacks an embedded temperature sensor so the
  15 D-Link vendor firmware uses this method to control the
  16 temperature of the NAS enclosure using the thermal sensor
  17 inside the hard drive.
  18
  19 The drive temperature trigger points to be used comes from
  20 the vendor firmware.
  21
  22 Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
  23 ---
  24  arch/arm/boot/dts/gemini-dlink-dir-685.dts | 48 ++++++++++++++++++++--
  25  1 file changed, 45 insertions(+), 3 deletions(-)
  26
  27 --- a/arch/arm/boot/dts/gemini-dlink-dir-685.dts
  28 +++ b/arch/arm/boot/dts/gemini-dlink-dir-685.dts
  29 @@ -119,13 +119,11 @@
  30
  31         /*
  32          * This is a Sunon Maglev GM0502PFV2-8 cooling fan @10000 RPM.
  33 -        * Since the platform has no temperature sensor, this is controlled
  34 -        * from userspace by using the hard disks S.M.A.R.T. temperature
  35          * sensor. It is turned on when the temperature exceeds 46 degrees
  36          * and turned off when the temperatures goes below 41 degrees
  37          * (celsius).
  38          */
  39 -       gpio-fan {
  40 +       fan0: gpio-fan {
  41                 compatible = "gpio-fan";
  42                 /* Collides with IDE */
  43                 gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
  44 @@ -133,6 +131,40 @@
  45                 #cooling-cells = <2>;
  46         };
  47
  48 +       thermal-zones {
  49 +               chassis-thermal {
  50 +                       /* Poll every 20 seconds */
  51 +                       polling-delay = <20000>;
  52 +                       /* Poll every 2nd second when cooling */
  53 +                       polling-delay-passive = <2000>;
  54 +                       /*  Use the thermal sensor in the hard drive */
  55 +                       thermal-sensors = <&drive0>;
  56 +
  57 +                       /* Tripping points from the fan.script in the rootfs */
  58 +                       trips {
  59 +                               alert: chassis-alert {
  60 +                                       /* At 43 degrees turn on the fan */
  61 +                                       temperature = <43000>;
  62 +                                       hysteresis = <3000>;
  63 +                                       type = "active";
  64 +                               };
  65 +                               crit: chassis-crit {
  66 +                                       /* Just shut down at 60 degrees */
  67 +                                       temperature = <60000>;
  68 +                                       hysteresis = <2000>;
  69 +                                       type = "critical";
  70 +                               };
  71 +                       };
  72 +
  73 +                       cooling-maps {
  74 +                               map0 {
  75 +                                       trip = <&alert>;
  76 +                                       cooling-device = <&fan0 1 1>;
  77 +                               };
  78 +                       };
  79 +               };
  80 +       };
  81 +
  82         /*
  83          * The touchpad input is connected to a GPIO bit-banged
  84          * I2C bus.
  85 @@ -445,6 +477,16 @@
  86
  87                 ide@63000000 {
  88                         status = "okay";
  89 +
  90 +                       /*
  91 +                        * This drive may have a temperature sensor with a
  92 +                        * thermal zone we can use for thermal control of the
  93 +                        * chassis temperature using the fan.
  94 +                        */
  95 +                       drive0: ide-port@0 {
  96 +                               reg = <0>;
  97 +                               #thermal-sensor-cells = <0>;
  98 +                       };
  99                 };
 100
 101                 display-controller@6a000000 {