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Vendor: QuickLogic Corp.


EOS S3 GPIO node


Properties not inherited from the base binding file.






Number of items to expect in a GPIO specifier

This property is required.

Constant value: 2



This property is used to preconfigure the GPIOs and connect them to
a primary(0) or a secondary(1) pin. EOS S3 supports up to 8 GPIOs
which can be configured as follows
"GPIO_NUM : primary_pin_num / secondary_pin_num"
"0 : 6 / 24"
"1 : 9 / 26"
"2 : 11 / 28"
"3 : 14 / 30"
"4 : 18 / 31"
"5 : 21 / 36"
"6 : 22 / 38"
"7 : 23 / 45"
E.g. configuring GPIO 2 as secondary results in controlling pin 28,
to do so set the bit on the 2nd index of this property
"pin-secondary-config = <0x04>;"

This property is required.



Convey's this node is a GPIO controller

This property is required.



This property indicates the number of in-use slots of available slots
for GPIOs. The typical example is something like this: the hardware
register is 32 bits wide, but only 18 of the bits have a physical
counterpart. The driver is generally written so that all 32 bits can
be used, but the IP block is reused in a lot of designs, some using
all 32 bits, some using 18 and some using 12. In this case, setting
"ngpios = <18>;" informs the driver that only the first 18 GPIOs, at
local offset 0 .. 17, are in use.  For cases in which there might be
holes in the slot range, this value should be the max slot number-1.

Default value: 32



If not all the GPIOs at offsets 0...N-1 are usable for ngpios = <N>, then
this property contains an additional set of tuples which specify which GPIOs
are unusable. This property indicates the start and size of the GPIOs
that can't be used.

For example, setting "gpio-reserved-ranges = <3 2>, <10 1>;" means that
GPIO offsets 3, 4, and 10 are not usable, even if ngpios = <18>.



This is an array of strings defining the names of the GPIO lines
going out of the GPIO controller

Specifier cell names

  • gpio cells: pin, flags