On Mon, Jan 20, 2014 at 2:48 PM, Russell King - ARM Linux
<linux@xxxxxxxxxxxxxxxx> wrote:
> So far so good. Now, what about this external oscillator which has its
> own separate power control. My immediate thought is that this can be
> specified via card_ext_clock - I would simply need to declare a fixed-rate
> clock with either a regulator (power switch) controlled via a gpio (which
> would probably be closer to the hardware) or a gpio as an enable... ah,
> that requires me to write a common clock driver for that bit since this
> is currently not modelled by CCF...
Isn't this covered by the gpios property of fixed-clock?
We do the following to enable the 26MHz codec clock in
imx51-babbage.dts via GPIO4_26:
clk_26M: codec_clock {
compatible = "fixed-clock";
reg=<0>;
#clock-cells = <0>;
clock-frequency = <26000000>;
gpios = <&gpio4 26 GPIO_ACTIVE_LOW>;
};
Regards,
Fabio Estevam
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