Re: [PATCH v4 4/6] reset: sunxi: Add Allwinner H3 bus resets

Jens Kuske
2015-11-01T13:41:10Z

Hi,

On 30/10/15 09:27, Arnd Bergmann wrote:
> On Tuesday 27 October 2015 17:50:24 Jens Kuske wrote:
>>
>> +static int sun8i_h3_bus_reset_xlate(struct reset_controller_dev *rcdev,
>> + const struct of_phandle_args *reset_spec)
>> +{
>> + unsigned int index = reset_spec->args[0];
>> +
>> + if (index < 96)
>> + return index;
>> + else if (index < 128)
>> + return index + 32;
>> + else if (index < 160)
>> + return index + 64;
>> + else
>> + return -EINVAL;
>> +}
>> +
>>
>
> This looks like you are doing something wrong and should either
> put the actual number into DT, or use a two-cell representation,
> with the first cell indicating the block (0, 1 or 2), and the
> second cell the index.
>

I tried to fix up the somewhat strange register layout here.

>From the datasheet:
BUS_SOFT_RST_REG0 0x02C0 Bus Software Reset Register 0
BUS_SOFT_RST_REG1 0x02C4 Bus Software Reset Register 1
BUS_SOFT_RST_REG2 0x02C8 Bus Software Reset Register 2
BUS_SOFT_RST_REG3 0x02D0 Bus Software Reset Register 3
BUS_SOFT_RST_REG4 0x02D8 Bus Software Reset Register 4

0x2cc and 0x2d4 are unused for some reason, but the regs are named 0-4,
so it lead to some confusion with the actual numbers in DT.
If we shouldn't do this I would be ok with putting the actual number
into DT too.

Jens