Changes between Version 21 and Version 22 of gpio


Ignore:
Timestamp:
06/18/2021 04:15:39 PM (13 months ago)
Author:
Tim Harvey
Comment:

add section for W_DISABLE#

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  • gpio

    v21 v22  
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     670[=#notable_gpio]
     671= Notable GPIO's on Gateworks boards
     672Gateworks boards use GPIO control for various things including:
     673 * General Purpose off-board GPIO/PWM
     674 * on-board LED's
     675 * Various enables for add-in cards
     676
    670677[=#led_class]
    671 = Linux LED class for GPIO (and PWM) controlled LEDs =
    672 see wiki:linux/led
     678== GPIO for LED's
     679While 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:
     680 * see wiki:linux/led
     681
     682[=#wlan_dis]
     683== W_DISABLE#
     684The 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.
     685
     686||= Board =||= GPIO pin/cont =||= GPIO offset =||= Linux GPIO =||= Notes =||
     687|| GW700x || GPIO4_IO7 GPIO4 || 7 || gpio103 || ||
     688|| ||
     689|| GW6xxx || GSC P0.0 i2c/0-0023 || 0 || gpio448 || This is a GSC gpio ||
     690|| ||
     691|| GW54xx || GPIO5_IO17 GPIO5 || 17 || gpio145 || ventana U-Boot drives this high by default ||
     692|| GW53xx || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
     693|| GW52xx || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
     694|| GW51xx || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
     695|| GW551x || GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
     696|| GW552x ||GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
     697|| GW553x ||GPIO7_IO12 || 12 || gpio209 || ventana U-Boot drives this high by default ||
     698|| GW5910 || GPIO1_IO0 || 0 || gpio0 || ventana U-Boot drives this high by default ||
     699|| GW5913 || GPIO1_IO0 || 0 || gpio0 || ventana U-Boot drives this high by default ||
     700
     701In 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).
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