Dinh,
On Mon, Oct 20, 2014 at 12:30 PM, Doug Anderson <dianders@xxxxxxxxxxxx> wrote:
> Dinh,
>
> On Mon, Oct 20, 2014 at 9:31 AM, Dinh Nguyen
> <dinguyen@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>>> &mmc0 {
>>>> - cd-gpios = <&gpio1 18 0>;
>>>> + cd = <&gpio1 18 0>;
>>>
>>> This doesn't look right to me. What was the error that was passed back?
>>>
>>> I think your change has the same net effect as just deleting the
>>> "cd-gpios" line. ...or is there some code somewhere that is parsing
>>> the "cd" property.
>>>
>>
>> It just hangs here:
>>
>> dw_mmc ff704000.dwmmc0: Using PIO mode.
>> dw_mmc ff704000.dwmmc0: Version ID is 240a
>> dw_mmc ff704000.dwmmc0: DW MMC controller at irq 171, 32 bit host data
>> width, 1024 deep fifo
>> platform ff704000.dwmmc0: Driver dw_mmc requests probe deferral
>>
>>
>> Without this patch :
>> mmc_of_parse ret=-517 (EPROBE_DEFER)
>
> I think you need to dig more into this error. Why are you getting an
> -EPROBE_DEFER when you asked for this GPIO?
>
> The -EPROBE_DEFER tells the system that a resource is not available
> yet and that it should try to re-run the dw_mmc init later once the
> resource becomes available. I believe that some other bug is causing
> the resource to never become available.
>
> Guesses:
>
> * The GPIO specifier is wrong in the DTB and is pointing to a GPIO
> that would never exist.
>
> * Something is happening in the GPIO driver that is causing it to fail.
>
>
> ...so we need to dig in further.
One odd thing is that it looks like the GPIO controller you're
referencing is disabled. On today's linuxnext, you can see the
"disabled":
arch/arm/boot/dts/socfpga.dtsi: gpio@ff709000 {
arch/arm/boot/dts/socfpga.dtsi- #address-cells = <1>;
arch/arm/boot/dts/socfpga.dtsi- #size-cells = <0>;
arch/arm/boot/dts/socfpga.dtsi- compatible = "snps,dw-apb-gpio";
arch/arm/boot/dts/socfpga.dtsi- reg = <0xff709000 0x1000>;
arch/arm/boot/dts/socfpga.dtsi- clocks = <&per_base_clk>;
arch/arm/boot/dts/socfpga.dtsi- status = "disabled";
arch/arm/boot/dts/socfpga.dtsi-
arch/arm/boot/dts/socfpga.dtsi- gpio1: gpio-controller@0 {
arch/arm/boot/dts/socfpga.dtsi- compatible =
"snps,dw-apb-gpio-port";
arch/arm/boot/dts/socfpga.dtsi- gpio-controller;
I don't see anyone else referencing that node to enable it. ...to me
that means that you can't use GPIOs on GPIO1 (???).
...or did I find something wrong?
-Doug
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