Changes between Version 21 and Version 22 of gpio

Timestamp:

06/18/2021 04:15:39 PM (3 years ago)

Author:

Tim Harvey

Comment:

add section for W_DISABLE#

gpio

@@ -668 +668 @@
 
 
+[=#notable_gpio]
+= Notable GPIO's on Gateworks boards
+Gateworks boards use GPIO control for various things including:
+ * General Purpose off-board GPIO/PWM
+ * on-board LED's
+ * Various enables for add-in cards
+
 [=#led_class]
-= Linux LED class for GPIO (and PWM) controlled LEDs =
-see wiki:linux/led
+== GPIO for LED's
+While SoC based GPIO's are often used for LED's on various Gateworks boards, there is a Linux gpio-led driver which has a sysfs interface for manipulating the LED's in Linux:
+ * see wiki:linux/led
+
+[=#wlan_dis]
+== W_DISABLE#
+The W_DISABLE# pin (aka WLAN_DIS#) is a pin on miniPCIe cards that if implemented disable radio operation according to the spec. In reality some radios use this as a GPIO that a radio driver can read and certain devices such as the WLE900VX ath10k 802.11 !WiFi radio will not even enumerate on the PCIe bus if this is driven low.
+
+||= Board =||= GPIO pin/cont =||= GPIO offset =||= Linux GPIO =||= Notes =||
+|| GW700x || GPIO4_IO7 GPIO4 || 7 || gpio103 || ||
+|| ||
+|| GW6xxx || GSC P0.0 i2c/0-0023 || 0 || gpio448 || This is a GSC gpio ||
+|| ||
+|| GW54xx || GPIO5_IO17 GPIO5 || 17 || gpio145 || ventana U-Boot drives this high by default ||
+|| GW53xx || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
+|| GW52xx || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
+|| GW51xx || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
+|| GW551x || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
+|| GW552x ||GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
+|| GW553x ||GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
+|| GW5910 || GPIO1_IO0 || 0 || gpio0 || ventana U-Boot drives this high by default ||
+|| GW5913 || GPIO1_IO0 || 0 || gpio0 || ventana U-Boot drives this high by default ||
+
+In most cases shown by the table above the GPIO above will be defaulted to driven high in boot firmware or have a pull-up on the card thus typically you would only need to make a change if you want to drive the signal low to 'assert' W_DISABLE# (to disable the card's RF output).