[U-Boot] [PATCH v2 4/7] tegra: fdt: Add NAND controller binding and definitions

[Simon Glass]

Hi Stephen,

On Fri, Apr 13, 2012 at 2:05 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
> On 04/13/2012 12:29 PM, Simon Glass wrote:
>> Add a NAND controller along with a bindings file for review.
>>
>> Signed-off-by: Simon Glass <sjg at chromium.org>
>
>> +++ b/doc/device-tree-bindings/nand/nvidia-nand.txt
>
> I'd prefer this be called nvidia,tegra20-nand.txt so filenames are named
> according to compatible value. This makes it easier to look things up.

OK, changed

>
>> +The device node for a NAND flash device is as described in the document
>> +"Open Firmware Recommended Practice : Universal Serial Bus" with the
>
> This is really based on USB?

Well just in that it follows the conventions. I will remove this since
I'm not sure we use anything that isn't in the ePAPR.

>
>> +Required properties :
>> + - compatible : Should be "manufacture,device", "nand-flash"
>> + - nvidia,page-data-bytes : Number of bytes in the data area
>> + - nvidia,page-spare-bytes : * Number of bytes in spare area
>
> Not sure what that "*" is?

Removed

>
>> +Nvidia NAND Controller
>> +----------------------
>> +
>> +The device node for a NAND flash controller is as described in the document
>> +"Open Firmware Recommended Practice : Universal Serial Bus" with the
>
> USB again?

Removed

>
>> +nand-controller at 0x70008000 {
>> +     compatible = "nvidia,tegra20-nand";
>> +     wp-gpios = <&gpio 59 0>;                /* PH3 */
>> +     nvidia,width = <8>;
>> +     nvidia,timing = <26 100 20 80 20 10 12 10 70>;
>> +     nand at 0 {
>> +             compatible = "hynix,hy27uf4g2b", "nand-flash";
>
> The TRM says there can be up to 8 chip selects. Don't the NAND device
> sub-nodes need a reg property to indicate which chip-select they're on?

We don't have driver support for this at present.

>
> Also, the TRM mentions async vs. ONFI devices. Don't we need properties
> somewhere to configure that kind of thing?

We don't have driver support for this at present, either :-(

>
>> +             nvidia,page-data-bytes = <2048>;
>> +             nvidia,tag-ecc-bytes = <4>;
>> +             nvidia,tag-bytes = <20>;
>> +             nvidia,data-ecc-bytes = <36>;
>> +             nvidia,skipped-spare-bytes = <4>;
>> +             nvidia,page-spare-bytes = <64>;
>> +     };
>> +};

Regards,
Simon