| Message ID | 20220307065230.12655-3-leilk.liu@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: mediatek: add single/quad mode support | expand |
Il 07/03/22 07:52, Leilk Liu ha scritto: > This patch adds dt-binding documentation for MT7986 with single mode. > > Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> > Acked-by: Rob Herring <robh@kernel.org> > --- > Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml b/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml > index bfa44acb1bdd..48024b98408a 100644 > --- a/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml > +++ b/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml > @@ -41,6 +41,7 @@ properties: > - mediatek,mt8135-spi > - mediatek,mt8173-spi > - mediatek,mt8183-spi > + - mediatek,mt7986-spi-single > > reg: > maxItems: 1 I think that the best way to do this is to better organize the compatibles per-hardware, here... or the compatibles list will eventually grow out of control for little reason. Since "IPM" is a new SPI controller IP, I would expect more and more MediaTek SoCs using it in the future, so here's my proposal: - Add a generic (const) compatible "mediatek,spi-ipm" to describe the hardware - Add an enumeration with "mediatek,mt7986-spi-ipm" as the only member, as to prepare this binding for the future. - Single and quad mode can be expressed with generic SPI bindings! Specifically, you can express that with "spi-rx-bus-width" for SPI_RX_{....} and "spi-tx-bus-width" for SPI_TX_{....}, so you don't need different compatibles for "mediatek,mt7986-spi-single" and "mediatek,mt7896-spi-quad". Fast example: spi@12345678 { compatible = "mediatek,mt7986-spi-ipm", "mediatek,spi-ipm"; reg = <....> /* Quad mode */ spi-rx-bus-width = <4>; spi-tx-bus-width = <4>; .... etc .... } Regards, Angelo
On Mon, 2022-03-07 at 11:32 +0100, AngeloGioacchino Del Regno wrote: > Il 07/03/22 07:52, Leilk Liu ha scritto: > > This patch adds dt-binding documentation for MT7986 with single > > mode. > > > > Signed-off-by: Leilk Liu <leilk.liu@mediatek.com> > > Acked-by: Rob Herring <robh@kernel.org> > > --- > > Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml | > > 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/Documentation/devicetree/bindings/spi/mediatek,spi- > > mt65xx.yaml b/Documentation/devicetree/bindings/spi/mediatek,spi- > > mt65xx.yaml > > index bfa44acb1bdd..48024b98408a 100644 > > --- a/Documentation/devicetree/bindings/spi/mediatek,spi- > > mt65xx.yaml > > +++ b/Documentation/devicetree/bindings/spi/mediatek,spi- > > mt65xx.yaml > > @@ -41,6 +41,7 @@ properties: > > - mediatek,mt8135-spi > > - mediatek,mt8173-spi > > - mediatek,mt8183-spi > > + - mediatek,mt7986-spi-single > > > > reg: > > maxItems: 1 > > I think that the best way to do this is to better organize the > compatibles > per-hardware, here... or the compatibles list will eventually grow > out of > control for little reason. > > Since "IPM" is a new SPI controller IP, I would expect more and more > MediaTek > SoCs using it in the future, so here's my proposal: Yes, we plan to use this IP with new ICs. > > - Add a generic (const) compatible "mediatek,spi-ipm" to describe the > hardware > - Add an enumeration with "mediatek,mt7986-spi-ipm" as the only > member, as to > prepare this binding for the future. > - Single and quad mode can be expressed with generic SPI bindings! > > Specifically, you can express that with "spi-rx-bus-width" for > SPI_RX_{....} > and "spi-tx-bus-width" for SPI_TX_{....}, so you don't need different > compatibles > for "mediatek,mt7986-spi-single" and "mediatek,mt7896-spi-quad". > > Fast example: > > spi@12345678 { > compatible = "mediatek,mt7986-spi-ipm", "mediatek,spi-ipm"; > reg = <....> > /* Quad mode */ > spi-rx-bus-width = <4>; > spi-tx-bus-width = <4>; > > .... etc .... > } > OK, thanks for your advice. > Regards, > Angelo > >
diff --git a/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml b/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml index bfa44acb1bdd..48024b98408a 100644 --- a/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml +++ b/Documentation/devicetree/bindings/spi/mediatek,spi-mt65xx.yaml @@ -41,6 +41,7 @@ properties: - mediatek,mt8135-spi - mediatek,mt8173-spi - mediatek,mt8183-spi + - mediatek,mt7986-spi-single reg: maxItems: 1