[PATCH v2 4/6] realtek: enable HWMON for SFP sensors

[Bjørn Mork]

This adds SFP sensors as a hwmon device, allowing readout of
temperatures, DOM and other sensor readings available from the
SFP.  Example from a ZyXEL GS1900-10HP with a DOM capable
1000Base-SX SFP:

root at gs1900-10hp:~# grep . /sys/class/hwmon/hwmon0/*
/sys/class/hwmon/hwmon0/curr1_crit:90
/sys/class/hwmon/hwmon0/curr1_crit_alarm:0
/sys/class/hwmon/hwmon0/curr1_input:4
/sys/class/hwmon/hwmon0/curr1_label:bias
/sys/class/hwmon/hwmon0/curr1_lcrit:0
/sys/class/hwmon/hwmon0/curr1_lcrit_alarm:0
/sys/class/hwmon/hwmon0/curr1_max:85
/sys/class/hwmon/hwmon0/curr1_max_alarm:0
/sys/class/hwmon/hwmon0/curr1_min:0
/sys/class/hwmon/hwmon0/curr1_min_alarm:0
/sys/class/hwmon/hwmon0/in0_crit:3795
/sys/class/hwmon/hwmon0/in0_crit_alarm:0
/sys/class/hwmon/hwmon0/in0_input:3317
/sys/class/hwmon/hwmon0/in0_label:VCC
/sys/class/hwmon/hwmon0/in0_lcrit:2805
/sys/class/hwmon/hwmon0/in0_lcrit_alarm:0
/sys/class/hwmon/hwmon0/in0_max:3465
/sys/class/hwmon/hwmon0/in0_max_alarm:0
/sys/class/hwmon/hwmon0/in0_min:3135
/sys/class/hwmon/hwmon0/in0_min_alarm:0
/sys/class/hwmon/hwmon0/name:sfp_p10
/sys/class/hwmon/hwmon0/power1_crit:708
/sys/class/hwmon/hwmon0/power1_crit_alarm:0
/sys/class/hwmon/hwmon0/power1_input:259
/sys/class/hwmon/hwmon0/power1_label:TX_power
/sys/class/hwmon/hwmon0/power1_lcrit:89
/sys/class/hwmon/hwmon0/power1_lcrit_alarm:0
/sys/class/hwmon/hwmon0/power1_max:501
/sys/class/hwmon/hwmon0/power1_max_alarm:0
/sys/class/hwmon/hwmon0/power1_min:126
/sys/class/hwmon/hwmon0/power1_min_alarm:0
/sys/class/hwmon/hwmon0/power2_crit:1259
/sys/class/hwmon/hwmon0/power2_crit_alarm:0
/sys/class/hwmon/hwmon0/power2_input:404
/sys/class/hwmon/hwmon0/power2_label:RX_power
/sys/class/hwmon/hwmon0/power2_lcrit:6
/sys/class/hwmon/hwmon0/power2_lcrit_alarm:0
/sys/class/hwmon/hwmon0/power2_max:794
/sys/class/hwmon/hwmon0/power2_max_alarm:0
/sys/class/hwmon/hwmon0/power2_min:10
/sys/class/hwmon/hwmon0/power2_min_alarm:0
/sys/class/hwmon/hwmon0/temp1_crit:100000
/sys/class/hwmon/hwmon0/temp1_crit_alarm:0
/sys/class/hwmon/hwmon0/temp1_input:22547
/sys/class/hwmon/hwmon0/temp1_label:temperature
/sys/class/hwmon/hwmon0/temp1_lcrit:-50000
/sys/class/hwmon/hwmon0/temp1_lcrit_alarm:0
/sys/class/hwmon/hwmon0/temp1_max:85000
/sys/class/hwmon/hwmon0/temp1_max_alarm:0
/sys/class/hwmon/hwmon0/temp1_min:-40000
/sys/class/hwmon/hwmon0/temp1_min_alarm:0
/sys/class/hwmon/hwmon0/uevent:OF_NAME=sfp-p10
/sys/class/hwmon/hwmon0/uevent:OF_FULLNAME=/sfp-p10
/sys/class/hwmon/hwmon0/uevent:OF_COMPATIBLE_0=sff,sfp
/sys/class/hwmon/hwmon0/uevent:OF_COMPATIBLE_N=1

Tested-by: Birger Koblitz <mail at birger-koblitz.de>
Signed-off-by: Bjørn Mork <bjorn at mork.no>
---
 target/linux/realtek/config-5.4 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/realtek/config-5.4 b/target/linux/realtek/config-5.4
index 2fbd904376fc..ed8c6023377f 100644
--- a/target/linux/realtek/config-5.4
+++ b/target/linux/realtek/config-5.4
@@ -82,6 +82,7 @@ CONFIG_HAS_DMA=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT_MAP=y
 # CONFIG_HIGH_RES_TIMERS is not set
+CONFIG_HWMON=y
 CONFIG_HZ=250
 CONFIG_HZ_250=y
 CONFIG_HZ_PERIODIC=y
-- 
2.20.1