[U-Boot] [PATCH v4 3/6] tegra: fdt: Add NAND controller binding and definitions

[Simon Glass]

Hi Scott,

On Tue, Jul 31, 2012 at 12:05 AM, Scott Wood <scottwood at freescale.com> wrote:
> On 07/30/2012 01:53 AM, Simon Glass wrote:
>> diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi
>> index f95be58..d936b1e 100644
>> --- a/arch/arm/dts/tegra20.dtsi
>> +++ b/arch/arm/dts/tegra20.dtsi
>> @@ -204,4 +204,11 @@
>>               compatible = "nvidia,tegra20-kbc";
>>               reg = <0x7000e200 0x0078>;
>>       };
>> +
>> +     nand: nand-controller at 70008000 {
>> +             #address-cells = <1>;
>> +             #size-cells = <0>;
>> +             compatible = "nvidia,tegra20-nand";
>> +             reg = <0x70008000 0x100>;
>> +     };
>>  };
>> diff --git a/doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt b/doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt
>> new file mode 100644
>> index 0000000..86ae408
>> --- /dev/null
>> +++ b/doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt
>> @@ -0,0 +1,53 @@
>> +NAND Flash
>> +----------
>> +
>> +(there isn't yet a generic binding in Linux, so this describes what is in
>> +U-Boot. There should not be Linux-specific or U-Boot specific binding, just
>> +a binding that describes this hardware. But agreeing a binding in Linux in
>> +the absence of a driver may be beyond my powers.)
>
> Please at least attempt to get a binding accepted in Linux, or perhaps
> in a neutral repository such as devicetree.org (but point out on
> devicetree-discuss that you've posted it there).  The device tree is
> supposed to describe the hardware, not what Linux currently uses.
>
>> +Example
>> +-------
>> +
>> +nand-controller at 0x70008000 {
>> +     compatible = "nvidia,tegra20-nand";
>> +     #address-cells = <1>;
>> +     #size-cells = <0>;
>> +     nvidia,wp-gpios = <&gpio 59 0>;         /* PH3 */
>> +     nvidia,nand-width = <8>;
>> +     nvidia,timing = <26 100 20 80 20 10 12 10 70>;
>> +     nand at 0 {
>> +             reg = <0>;
>> +             compatible = "hynix,hy27uf4g2b", "nand-flash";
>> +     };
>> +};
>
> Where is "reg" in the parent node?  You're not supposed to have a unit
> address without reg.   Also, most bus bindings don't put 0x in the unit
> address).
>
> I see that it's OK in the actual .dtsi -- it's just the example that
> needs fixing.

OK I will fix these and send a new patch.

Regards,
Simon

>
> -Scott
>
>