Martin, in my flow-up mail I found this wrong numbering also. I attched a copy of the relavant section from this mail. I defined a new "label" gpio_pca and reference gpio0 of the pca ...
On Sonntag, 14. Mai 2017 23:50:25 CEST Mathias Kresin wrote:
> > poe_passthrough {
> >
> > gpio-export,name = "poe_power_port0";
> > gpio-export,output = <1>;
> > gpios = <&gpio0 496 0>;
>
> Your GPIO number is wrong.
>
When using the following dts-file it improves, a bit:
/ {
model = "UBNT-ERX-SFP";
i2c-gpio {
compatible = "i2c-gpio";
gpios = <&gpio0 3 GPIO_ACTIVE_HIGH /* sda */
&gpio0 4 GPIO_ACTIVE_HIGH /* scl */
>;
#address-cells = <1>;
#size-cells = <0>;
gpio_pca: pca9555@25 {
compatible = "pca9555";
reg = <0x25>;
};
};
gpio_export {
compatible = "gpio-export";
#size-cells = <0>;
poe_passthrough {
gpio-export,name = "poe_power_port0";
gpio-export,output = <1>;
gpios = <&gpio_pca 0 0>;
};
};
};
I think I got the trick to define a name for the PCA-gpio-chip and
reference it in the gpio-export section.
But it fails now with
[ 1.640000] /gpio_export/poe_passthrough: could not get #gpio-cells for
/i2c-gpio/pca9555@25
[ 1.660000] ------------[ cut here ]------------
[ 1.670000] WARNING: CPU: 3 PID: 1 at drivers/gpio/gpiolib.c:85 0x801dc2fc()
[ 1.680000] invalid GPIO -22
[ 1.690000] Modules linked in:
[ 1.690000] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.4.61 #0
seems not to find the i2c-pca and it's gpios, as these modules are not
compile into the kernel.
[ 10.460000] kmodloader: loading kernel modules from /etc/modules.d/*
[ 10.470000] i2c /dev entries driver
[ 10.480000] pca953x 0-0025: interrupt support not compiled in
[ 10.500000] i2c-gpio i2c-gpio: using pins 3 (SDA) and 4 (SCL)
[ 10.510000] PPP generic driver version 2.4.2
They will load during init.scripts.
I see following options:
- use the 03-gpio script in board.d
- compile the drivers into the kernel, but will this be done for all
mt7621-kernels?
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