On 4/11/22 09:05, Ashish Mhetre wrote:
>
>
> On 4/10/2022 7:48 PM, Dmitry Osipenko wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> 06.04.2022 08:24, Ashish Mhetre пишет:
>>> + num_dt_channels =
>>> of_property_count_elems_of_size(pdev->dev.of_node, "reg",
>>> + reg_cells *
>>> sizeof(u32));
>>> + /*
>>> + * On tegra186 onwards, memory controller support multiple
>>> channels.
>>> + * Apart from regular memory controller channels, there is one
>>> broadcast
>>> + * channel and one for stream-id registers.
>>> + */
>>> + if (num_dt_channels < mc->soc->num_channels + 2) {
>>> + dev_warn(&pdev->dev, "MC channels are missing, please
>>> update memory controller DT node with MC channels\n");
>>> + return 0;
>>> + }
>>> +
>>> + mc->bcast_ch_regs = devm_platform_ioremap_resource_byname(pdev,
>>> "mc-broadcast");
>>> + if (IS_ERR(mc->bcast_ch_regs))
>>> + return PTR_ERR(mc->bcast_ch_regs);
>>
>> Looks to me that you don't need to use of_property_count_elems_of_size()
>> and could only check the "mc-broadcast" presence to decide whether this
>> is an older DT.
>>
> Now that we are using reg-names in new DT, yes it'd be fine to just
> check mc-broadcast to decide it's a new or old DT.
>
>> mc->bcast_ch_regs = devm_platform_ioremap_resource_byname(pdev,
>> "broadcast");
>> if (IS_ERR(mc->bcast_ch_regs)) {
>> dev_warn(&pdev->dev, "Broadcast channel is missing, please
>> update your
>> device-tree\n");
>> return PTR_ERR(mc->bcast_ch_regs);
>> }
>
> return 0;
>
> to avoid DT ABI break, right?
Yes, it should be "return 0".
