| Message ID | 20190921151835.770263-2-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | add the DDR clock controller on Meson8 and Meson8b | expand |
On Sat, Sep 21, 2019 at 05:18:30PM +0200, Martin Blumenstingl wrote: > Amlogic Meson8, Meson8b and Meson8m2 SoCs have a DDR clock controller in > the MMCBUS registers. There is no public documentation on this, but the > GPL u-boot sources from the Amlogic BSP show that: > - it uses the same XTAL input as the main clock controller > - it contains a PLL which seems to be implemented just like the other > PLLs in this SoC > - there is a power-of-two PLL post-divider > > Add the documentation and header file for this DDR clock controller. > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > --- > .../clock/amlogic,meson8-ddr-clkc.yaml | 50 +++++++++++++++++++ > include/dt-bindings/clock/meson8-ddr-clkc.h | 4 ++ > 2 files changed, 54 insertions(+) > create mode 100644 Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml > create mode 100644 include/dt-bindings/clock/meson8-ddr-clkc.h > > diff --git a/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml > new file mode 100644 > index 000000000000..bf3ca5888485 > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml > @@ -0,0 +1,50 @@ > +# SPDX-License-Identifier: GPL-2.0 (GPL-2.0-only OR BSD-2-Clause) for new bindings please. With that, Reviewed-by: Rob Herring <robh@kernel.org> > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/clock/amlogic,meson8-ddr-clkc.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Amlogic DDR Clock Controller Device Tree Bindings > + > +maintainers: > + - Martin Blumenstingl <martin.blumenstingl@googlemail.com> > + > +properties: > + compatible: > + enum: > + - amlogic,meson8-ddr-clkc > + - amlogic,meson8b-ddr-clkc > + > + reg: > + maxItems: 1 > + > + clocks: > + maxItems: 1 > + > + clock-names: > + items: > + - const: xtal > + > + "#clock-cells": > + const: 1 > + > +required: > + - compatible > + - reg > + - clocks > + - clock-names > + - "#clock-cells" > + > +additionalProperties: false > + > +examples: > + - | > + ddr_clkc: clock-controller@400 { > + compatible = "amlogic,meson8-ddr-clkc"; > + reg = <0x400 0x20>; > + clocks = <&xtal>; > + clock-names = "xtal"; > + #clock-cells = <1>; > + }; > + > +... > diff --git a/include/dt-bindings/clock/meson8-ddr-clkc.h b/include/dt-bindings/clock/meson8-ddr-clkc.h > new file mode 100644 > index 000000000000..a8e0fa2987ab > --- /dev/null > +++ b/include/dt-bindings/clock/meson8-ddr-clkc.h > @@ -0,0 +1,4 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > + > +#define DDR_CLKID_DDR_PLL_DCO 0 > +#define DDR_CLKID_DDR_PLL 1 > -- > 2.23.0 >
diff --git a/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml new file mode 100644 index 000000000000..bf3ca5888485 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml @@ -0,0 +1,50 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/amlogic,meson8-ddr-clkc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Amlogic DDR Clock Controller Device Tree Bindings + +maintainers: + - Martin Blumenstingl <martin.blumenstingl@googlemail.com> + +properties: + compatible: + enum: + - amlogic,meson8-ddr-clkc + - amlogic,meson8b-ddr-clkc + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + clock-names: + items: + - const: xtal + + "#clock-cells": + const: 1 + +required: + - compatible + - reg + - clocks + - clock-names + - "#clock-cells" + +additionalProperties: false + +examples: + - | + ddr_clkc: clock-controller@400 { + compatible = "amlogic,meson8-ddr-clkc"; + reg = <0x400 0x20>; + clocks = <&xtal>; + clock-names = "xtal"; + #clock-cells = <1>; + }; + +... diff --git a/include/dt-bindings/clock/meson8-ddr-clkc.h b/include/dt-bindings/clock/meson8-ddr-clkc.h new file mode 100644 index 000000000000..a8e0fa2987ab --- /dev/null +++ b/include/dt-bindings/clock/meson8-ddr-clkc.h @@ -0,0 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#define DDR_CLKID_DDR_PLL_DCO 0 +#define DDR_CLKID_DDR_PLL 1
Amlogic Meson8, Meson8b and Meson8m2 SoCs have a DDR clock controller in the MMCBUS registers. There is no public documentation on this, but the GPL u-boot sources from the Amlogic BSP show that: - it uses the same XTAL input as the main clock controller - it contains a PLL which seems to be implemented just like the other PLLs in this SoC - there is a power-of-two PLL post-divider Add the documentation and header file for this DDR clock controller. Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> --- .../clock/amlogic,meson8-ddr-clkc.yaml | 50 +++++++++++++++++++ include/dt-bindings/clock/meson8-ddr-clkc.h | 4 ++ 2 files changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml create mode 100644 include/dt-bindings/clock/meson8-ddr-clkc.h