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authorChristian Lamparter <chunkeey@gmail.com>2022-02-17 21:15:54 +0100
committerChristian Lamparter <chunkeey@gmail.com>2022-02-25 17:54:56 +0100
commit8144f9c665327cae94a4e4b27ed3789d3777f978 (patch)
tree71553279669125015400c3eaea0ee3077a9fc568 /target/linux/generic
parent71d86a2db92d3426f594b21873b9a2cc952b33c2 (diff)
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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.patch71
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 },
+ { },