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SubjectRe: [PATCH net-next 5/6] net: dsa: realtek-smi: add rtl8365mb subdriver for RTL8365MB-VC
Date
On 10/13/21 5:12 PM, Linus Walleij wrote:
> On Tue, Oct 12, 2021 at 2:37 PM Alvin Šipraga <alvin@pqrs.dk> wrote:
>
>> This patch adds a realtek-smi subdriver for the RTL8365MB-VC 4+1 port
>> 10/100/1000M switch controller. The driver has been developed based on a
>> GPL-licensed OS-agnostic Realtek vendor driver known as rtl8367c found
>> in the OpenWrt source tree.
> (...)
>> Co-developed-by: Michael Rasmussen <mir@bang-olufsen.dk>
>> Signed-off-by: Michael Rasmussen <mir@bang-olufsen.dk>
>> Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
>
> Overall this driver looks very good :)
>
> Some minor nits below:
>
>> +static irqreturn_t rtl8365mb_irq(int irq, void *data)
>> +{
> (...)
>> + if (!line_changes)
>> + goto out_none;
>> +
>> + while (line_changes) {
>> + int line = __ffs(line_changes);
>> + int child_irq;
>> +
>> + line_changes &= ~BIT(line);
>> +
>> + child_irq = irq_find_mapping(smi->irqdomain, line);
>> + handle_nested_irq(child_irq);
>> + }
>
> What about just:
>
> for_each_set_bit(offset, &line_changes, 32) {
> child_irq = irq_find_mapping(smi->irqdomain, line);
> handle_nested_irq(child_irq);
> }
>
> ?
>
> I don't know how many or which bits are valid IRQs, 16 maybe rather
> than 32.
>
>> +static struct irq_chip rtl8365mb_irq_chip = {
>> + .name = "rtl8365mb",
>> + /* The hardware doesn't support masking IRQs on a per-port basis */
>> +};
>
> I would rathe make this a dynamically allocated struct inside
> struct rtl8365mb, so the irqchip lives with the instance of the
> chip. (Which is nice if there would happen to be two of these
> chips in a system.)

Forgive my ignorance, but is it actually necessary? Can't multiple
instances of the switch still use the same irq_chip structure? That
seems to be OK for the dummy chip, for example (dummychip.c). I also
failed to find a driver which does it the way you suggest.

I will incorporate the rest of your feedback into v3. :)

>
>> +static int _rtl8365mb_irq_enable(struct realtek_smi *smi, bool enable)
>
> I'm personally a bit allergic to _rand_underscore_naming, as sometimes
> that means "inner function" and sometimes it means "compiler intrinsic"
> I would just name it rtl8365mb_irq_config_commit()
>
> (no strong opinion)
>
>> + /* Configure chip interrupt signal polarity */
>> + irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
>
> Nice that you preserve this edge trigger config from the machine
> description (DT)!
>
> With this fixed or not (your preference)
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
>
> Yours,
> Linus Walleij
>

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