| Message ID | 20220914085451.11723-5-arinc.unal@arinc9.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dt-bindings and mt7621 devicetree changes | expand |
On Wed, Sep 14, 2022 at 10:55 AM Arınç ÜNAL <arinc.unal@arinc9.com> wrote: > > Add syscon as a constant string on the compatible property as it's required > for the SoC to work. Update the example accordingly. > > Fixes: 5278e4a181ff ("dt-bindings: memory: add binding for Mediatek's MT7621 SDRAM memory controller") > Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com> > --- > .../bindings/memory-controllers/mediatek,mt7621-memc.yaml | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Thanks, Sergio Paracuellos
On Wed, Sep 14, 2022 at 11:54:45AM +0300, Arınç ÜNAL wrote: > Add syscon as a constant string on the compatible property as it's required > for the SoC to work. Update the example accordingly. It's not required. It's required to automagically create a regmap. That can be done yourself as well. The downside to adding 'syscon' is it requires a DT update. Maybe that's fine for this platform? I don't know. > > Fixes: 5278e4a181ff ("dt-bindings: memory: add binding for Mediatek's MT7621 SDRAM memory controller") > Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com> > --- > .../bindings/memory-controllers/mediatek,mt7621-memc.yaml | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml > index 85e02854f083..6ccdaf99c778 100644 > --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml > +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml > @@ -11,7 +11,9 @@ maintainers: > > properties: > compatible: > - const: mediatek,mt7621-memc > + items: > + - const: mediatek,mt7621-memc > + - const: syscon > > reg: > maxItems: 1 > @@ -25,6 +27,6 @@ additionalProperties: false > examples: > - | > memory-controller@5000 { > - compatible = "mediatek,mt7621-memc"; > + compatible = "mediatek,mt7621-memc", "syscon"; > reg = <0x5000 0x1000>; > }; > -- > 2.34.1 > >
On 14.09.2022 18:14, Rob Herring wrote: > On Wed, Sep 14, 2022 at 11:54:45AM +0300, Arınç ÜNAL wrote: >> Add syscon as a constant string on the compatible property as it's required >> for the SoC to work. Update the example accordingly. > > It's not required. It's required to automagically create a regmap. That > can be done yourself as well. The downside to adding 'syscon' is it > requires a DT update. Maybe that's fine for this platform? I don't know. My GB-PC2 won't boot without syscon on mt7621.dtsi. This string was always there on the memory controller node on mt7621.dtsi. Arınç
On Wed, Sep 14, 2022 at 5:19 PM Arınç ÜNAL <arinc.unal@arinc9.com> wrote: > > On 14.09.2022 18:14, Rob Herring wrote: > > On Wed, Sep 14, 2022 at 11:54:45AM +0300, Arınç ÜNAL wrote: > >> Add syscon as a constant string on the compatible property as it's required > >> for the SoC to work. Update the example accordingly. > > > > It's not required. It's required to automagically create a regmap. That > > can be done yourself as well. The downside to adding 'syscon' is it > > requires a DT update. Maybe that's fine for this platform? I don't know. > > My GB-PC2 won't boot without syscon on mt7621.dtsi. This string was > always there on the memory controller node on mt7621.dtsi. The string was introduced because the mt7621 clock driver needs to read some registers creating a regmap from the syscon. The bindings were added before the clock driver was properly mainlined and at first the clock driver was using ralink architecture dependent operations rt_memc_* defined in 'arch/mips/include/asm/mach-ralink/ralink_regs.h'. I forgot to update the mem controller binding when memc became a syscon so I think this patch is correct. I also think the sample should use 'syscon' in the node name instead of memory-controller. Best regards, Sergio Paracuellos > > Arınç
On 15.09.2022 06:21, Sergio Paracuellos wrote: > On Wed, Sep 14, 2022 at 5:19 PM Arınç ÜNAL <arinc.unal@arinc9.com> wrote: >> >> On 14.09.2022 18:14, Rob Herring wrote: >>> On Wed, Sep 14, 2022 at 11:54:45AM +0300, Arınç ÜNAL wrote: >>>> Add syscon as a constant string on the compatible property as it's required >>>> for the SoC to work. Update the example accordingly. >>> >>> It's not required. It's required to automagically create a regmap. That >>> can be done yourself as well. The downside to adding 'syscon' is it >>> requires a DT update. Maybe that's fine for this platform? I don't know. >> >> My GB-PC2 won't boot without syscon on mt7621.dtsi. This string was >> always there on the memory controller node on mt7621.dtsi. > > The string was introduced because the mt7621 clock driver needs to > read some registers creating a regmap from the syscon. The bindings > were added before the clock driver was properly mainlined and at first > the clock driver was using ralink architecture dependent operations > rt_memc_* defined in > 'arch/mips/include/asm/mach-ralink/ralink_regs.h'. I forgot to update > the mem controller binding when memc became a syscon so I think this > patch is correct. I also think the sample should use 'syscon' in the > node name instead of memory-controller. Will change to syscon in v2. Arınç
diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml index 85e02854f083..6ccdaf99c778 100644 --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml @@ -11,7 +11,9 @@ maintainers: properties: compatible: - const: mediatek,mt7621-memc + items: + - const: mediatek,mt7621-memc + - const: syscon reg: maxItems: 1 @@ -25,6 +27,6 @@ additionalProperties: false examples: - | memory-controller@5000 { - compatible = "mediatek,mt7621-memc"; + compatible = "mediatek,mt7621-memc", "syscon"; reg = <0x5000 0x1000>; };
Add syscon as a constant string on the compatible property as it's required for the SoC to work. Update the example accordingly. Fixes: 5278e4a181ff ("dt-bindings: memory: add binding for Mediatek's MT7621 SDRAM memory controller") Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com> --- .../bindings/memory-controllers/mediatek,mt7621-memc.yaml | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)