[meta-freescale] Device tree question
Nikolay Dimitrov
picmaster at mail.bg
Mon Jul 13 07:51:59 PDT 2015
Hi Gary,
On 07/13/2015 05:37 PM, Gary Thomas wrote:
> A bit off topic, but perhaps someone here knows the answer :-)
>
> If my device tree has a device/element that is enabled, why would
> that device be disabled when I boot? I have this on my (LS1021) board:
> quadspi at 1550000 {
> compatible = "fsl,ls1-qspi";
> #address-cells = <0x00000001>;
> #size-cells = <0x00000000>;
> reg = <0x00000000 0x01550000 0x00000000 0x00010000
> 0x00000000 0x40000000 0x00000000 0x04000000>;
> reg-names = "QuadSPI", "QuadSPI-memory";
> interrupts = <0x00000000 0x00000083 0x00000004>;
> clock-names = "qspi_en", "qspi";
> clocks = <0x00000003 0x00000001 0x00000003 0x00000001>;
> big-endian;
> amba-base = <0x40000000>;
> num-cs = <0x00000002>;
> status = "okay";
> s70fl01gs at 0 {
> #address-cells = <0x00000001>;
> #size-cells = <0x00000001>;
> compatible = "spansion,s70fl01gs";
> spi-max-frequency = <0x02faf080>;
> reg = <0x00000000>;
> partition at 0 {
> label = "s70fl01gs-0";
> reg = <0x00000000 0x04000000>;
> };
> };
> };
>
> However when I boot the system, this device is disabled.
> # cat /proc/device-tree/soc/quadspi at 1550000/status
> disabled
> I know this must happen very early on as the device driver
> for this device is never even probed.
>
> Any ideas where/why this becomes disabled and how I keep that
> from happening?
>
Is it possible to have an invalid device node parameter, which can
cause the node to become disabled? Have you seen related warn/err
messages in the bootlog? Also, is the ls1-qspi driver enabled in the
defconfig (stupid question, but sometimes we do such things :D).
Regards,
Nikolay
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