target/linux/generic/backport-5.10/870-hwmon-next-hwmon-lm70-Add-ti-tmp125-support.patch

   1 From 31d8f414e1596ba54a4315418e4c0086fda9e428 Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Fri, 18 Feb 2022 10:06:43 +0100
   4 Subject: hwmon: (lm70) Add ti,tmp125 support
   5
   6 The TMP125 is a 2 degree Celsius accurate Digital
   7 Temperature Sensor with a SPI interface.
   8
   9 The temperature register is a 16-bit, read-only register.
  10 The MSB (Bit 15) is a leading zero and never set. Bits 14
  11 to 5 are the 1+9 temperature data bits in a two's
  12 complement format. Bits 4 to 0 are useless copies of
  13 Bit 5 value and therefore ignored.
  14
  15 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  16 Link: https://lore.kernel.org/r/43b19cbd4e7f51e9509e561b02b5d8d0e7079fac.1645175187.git.chunkeey@gmail.com
  17 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  18 ---
  19 --- a/drivers/hwmon/lm70.c
  20 +++ b/drivers/hwmon/lm70.c
  21 @@ -34,6 +34,7 @@
  22  #define LM70_CHIP_LM71         2       /* NS LM71 */
  23  #define LM70_CHIP_LM74         3       /* NS LM74 */
  24  #define LM70_CHIP_TMP122       4       /* TI TMP122/TMP124 */
  25 +#define LM70_CHIP_TMP125       5       /* TI TMP125 */
  26
  27  struct lm70 {
  28         struct spi_device *spi;
  29 @@ -87,6 +88,12 @@ static ssize_t temp1_input_show(struct d
  30          * LM71:
  31          * 14 bits of 2's complement data, discard LSB 2 bits,
  32          * resolution 0.0312 degrees celsius.
  33 +        *
  34 +        * TMP125:
  35 +        * MSB/D15 is a leading zero. D14 is the sign-bit. This is
  36 +        * followed by 9 temperature bits (D13..D5) in 2's complement
  37 +        * data format with a resolution of 0.25 degrees celsius per unit.
  38 +        * LSB 5 bits (D4..D0) share the same value as D5 and get discarded.
  39          */
  40         switch (p_lm70->chip) {
  41         case LM70_CHIP_LM70:
  42 @@ -102,6 +109,10 @@ static ssize_t temp1_input_show(struct d
  43         case LM70_CHIP_LM71:
  44                 val = ((int)raw / 4) * 3125 / 100;
  45                 break;
  46 +
  47 +       case LM70_CHIP_TMP125:
  48 +               val = (sign_extend32(raw, 14) / 32) * 250;
  49 +               break;
  50         }
  51
  52         status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */
  53 @@ -136,6 +147,10 @@ static const struct of_device_id lm70_of
  54                 .data = (void *) LM70_CHIP_TMP122,
  55         },
  56         {
  57 +               .compatible = "ti,tmp125",
  58 +               .data = (void *) LM70_CHIP_TMP125,
  59 +       },
  60 +       {
  61                 .compatible = "ti,lm71",
  62                 .data = (void *) LM70_CHIP_LM71,
  63         },
  64 @@ -184,6 +199,7 @@ static const struct spi_device_id lm70_i
  65         { "lm70",   LM70_CHIP_LM70 },
  66         { "tmp121", LM70_CHIP_TMP121 },
  67         { "tmp122", LM70_CHIP_TMP122 },
  68 +       { "tmp125", LM70_CHIP_TMP125 },
  69         { "lm71",   LM70_CHIP_LM71 },
  70         { "lm74",   LM70_CHIP_LM74 },
  71         { },