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| author | Christian Lamparter <chunkeey@gmail.com> | 2022-02-17 21:15:54 +0100 |
|---|---|---|
| committer | Christian Lamparter <chunkeey@gmail.com> | 2022-02-25 17:54:56 +0100 |
| commit | 8144f9c665327cae94a4e4b27ed3789d3777f978 (patch) | |
| tree | 71553279669125015400c3eaea0ee3077a9fc568 /target/linux/generic | |
| parent | 71d86a2db92d3426f594b21873b9a2cc952b33c2 (diff) | |
| download | upstream-8144f9c665327cae94a4e4b27ed3789d3777f978.tar.gz upstream-8144f9c665327cae94a4e4b27ed3789d3777f978.tar.bz2 upstream-8144f9c665327cae94a4e4b27ed3789d3777f978.zip | |
mpc85xx: HiveAP-330: add tmp125 temperature sensor
the Aerohive HiveAP-330 and HiveAP-350 come equipped
with an TI TMP125 temperature chip. This patch wires
up the necessary support for this sensor and exposes
it through hwmon / thermal sensor framework. Upstream
support is coming, but it has to go through hwmon-next
first.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Diffstat (limited to 'target/linux/generic')
| -rw-r--r-- | target/linux/generic/backport-5.10/870-hwmon-next-hwmon-lm70-Add-ti-tmp125-support.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/870-hwmon-next-hwmon-lm70-Add-ti-tmp125-support.patch b/target/linux/generic/backport-5.10/870-hwmon-next-hwmon-lm70-Add-ti-tmp125-support.patch new file mode 100644 index 0000000000..fabf177628 --- /dev/null +++ b/target/linux/generic/backport-5.10/870-hwmon-next-hwmon-lm70-Add-ti-tmp125-support.patch @@ -0,0 +1,71 @@ +From 31d8f414e1596ba54a4315418e4c0086fda9e428 Mon Sep 17 00:00:00 2001 +From: Christian Lamparter <chunkeey@gmail.com> +Date: Fri, 18 Feb 2022 10:06:43 +0100 +Subject: hwmon: (lm70) Add ti,tmp125 support + +The TMP125 is a 2 degree Celsius accurate Digital +Temperature Sensor with a SPI interface. + +The temperature register is a 16-bit, read-only register. +The MSB (Bit 15) is a leading zero and never set. Bits 14 +to 5 are the 1+9 temperature data bits in a two's +complement format. Bits 4 to 0 are useless copies of +Bit 5 value and therefore ignored. + +Signed-off-by: Christian Lamparter <chunkeey@gmail.com> +Link: https://lore.kernel.org/r/43b19cbd4e7f51e9509e561b02b5d8d0e7079fac.1645175187.git.chunkeey@gmail.com +Signed-off-by: Guenter Roeck <linux@roeck-us.net> +--- +--- a/drivers/hwmon/lm70.c ++++ b/drivers/hwmon/lm70.c +@@ -34,6 +34,7 @@ + #define LM70_CHIP_LM71 2 /* NS LM71 */ + #define LM70_CHIP_LM74 3 /* NS LM74 */ + #define LM70_CHIP_TMP122 4 /* TI TMP122/TMP124 */ ++#define LM70_CHIP_TMP125 5 /* TI TMP125 */ + + struct lm70 { + struct spi_device *spi; +@@ -87,6 +88,12 @@ static ssize_t temp1_input_show(struct d + * LM71: + * 14 bits of 2's complement data, discard LSB 2 bits, + * resolution 0.0312 degrees celsius. ++ * ++ * TMP125: ++ * MSB/D15 is a leading zero. D14 is the sign-bit. This is ++ * followed by 9 temperature bits (D13..D5) in 2's complement ++ * data format with a resolution of 0.25 degrees celsius per unit. ++ * LSB 5 bits (D4..D0) share the same value as D5 and get discarded. + */ + switch (p_lm70->chip) { + case LM70_CHIP_LM70: +@@ -102,6 +109,10 @@ static ssize_t temp1_input_show(struct d + case LM70_CHIP_LM71: + val = ((int)raw / 4) * 3125 / 100; + break; ++ ++ case LM70_CHIP_TMP125: ++ val = (sign_extend32(raw, 14) / 32) * 250; ++ break; + } + + status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */ +@@ -136,6 +147,10 @@ static const struct of_device_id lm70_of + .data = (void *) LM70_CHIP_TMP122, + }, + { ++ .compatible = "ti,tmp125", ++ .data = (void *) LM70_CHIP_TMP125, ++ }, ++ { + .compatible = "ti,lm71", + .data = (void *) LM70_CHIP_LM71, + }, +@@ -184,6 +199,7 @@ static const struct spi_device_id lm70_i + { "lm70", LM70_CHIP_LM70 }, + { "tmp121", LM70_CHIP_TMP121 }, + { "tmp122", LM70_CHIP_TMP122 }, ++ { "tmp125", LM70_CHIP_TMP125 }, + { "lm71", LM70_CHIP_LM71 }, + { "lm74", LM70_CHIP_LM74 }, + { }, |