Re: [PATCH 1/2] stmmac: dwmac-mediatek: add support for mt8188

[Jianguo Zhang]

Dear Krzysztof,

On Mon, 2022-09-19 at 11:27 +0200, Krzysztof Kozlowski wrote:
> On 19/09/2022 10:37, Jianguo Zhang wrote:
> > Dear Krzysztof,
> > 
> > 	Thanks for your comments.
> > 
> > 
> > On Mon, 2022-09-19 at 10:19 +0200, Krzysztof Kozlowski wrote:
> > > On 19/09/2022 10:04, Jianguo Zhang wrote:
> > > > Add ethernet support for MediaTek SoCs from mt8188 family.
> > > > As mt8188 and mt8195 have same ethernet design, so private data
> > > > "mt8195_gmac_variant" can be reused for mt8188.
> > > > 
> > > > Signed-off-by: Jianguo Zhang <jianguo.zhang@xxxxxxxxxxxx>
> > > > ---
> > > >  drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > > 
> > > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-
> > > > mediatek.c
> > > > b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > > > index d42e1afb6521..f45be440b6d0 100644
> > > > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > > > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > > > @@ -720,6 +720,8 @@ static const struct of_device_id
> > > > mediatek_dwmac_match[] = {
> > > >  	  .data = &mt2712_gmac_variant },
> > > >  	{ .compatible = "mediatek,mt8195-gmac",
> > > >  	  .data = &mt8195_gmac_variant },
> > > > +	{ .compatible = "mediatek,mt8188-gmac",
> > > > +	  .data = &mt8195_gmac_variant },
> > > 
> > > It's the same. No need for new entry.
> > > 
> > 
> > mt8188 and mt8195 are different SoCs and we need to distinguish
> > mt8188
> > from mt8195, so I think a new entry is needed for mt8188 with the
> > specific "compatiable".
> 
> No, this does not justify new entry. You need specific compatible,
> but
> not new entry.
> 
> > On the other hand, mt8188 and mt8195 have same ethernet design, so
> > the
> > private data "mt8195_gmac_variant" can be resued to reduce
> > redundant
> > info in driver.
> 
> And you do not need new entry in the driver.
Do you mean that I can use "mediatek,mt8195-gmac" as compatible for
ethernet in mt8188 DTS file?
> 
> Best regards,
> Krzysztof

BRS
Jianguo