| Message ID | b9a87c69eb603622303add4f0c02dd4c1262462a.1572558427.git.leonard.crestez@nxp.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | PM / devfreq: Add dynamic scaling for imx ddr controller | expand |
On Thu, Oct 31, 2019 at 11:50:24PM +0200, Leonard Crestez wrote: > Add devicetree bindings for the i.MX DDR Controller on imx8m series > chips. It supports dynamic frequency switching between multiple data > rates and this is exposed to Linux via the devfreq subsystem. > > Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> > --- > .../devicetree/bindings/devfreq/imx-ddrc.yaml | 60 +++++++++++++++++++ .../bindings/memory-controllers/ > 1 file changed, 60 insertions(+) > create mode 100644 Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml > > diff --git a/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml > new file mode 100644 > index 000000000000..31db204e6845 > --- /dev/null > +++ b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml > @@ -0,0 +1,60 @@ > +# SPDX-License-Identifier: GPL-2.0 For new bindings: # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/devfreq/imx-devfreq.yaml# Run 'make dt_binding_check'. This will fail as the filename doesn't match. > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: i.MX DDR Controller Perhaps i.MX8x as it's not all i.MX chips. And the filename too? > + > +maintainers: > + - Leonard Crestez <leonard.crestez@nxp.com> > + > +properties: > + compatible: > + items: > + - enum: > + - fsl,imx8mn-ddrc > + - fsl,imx8mm-ddrc > + - fsl,imx8mq-ddrc > + - const: fsl,imx8m-ddrc > + > + reg: > + maxItems: 1 > + > + clocks: > + maxItems: 4 > + > + clock-names: > + items: > + - const: dram_core > + - const: dram_pll > + - const: dram_alt > + - const: dram_apb Drop 'dram_' > + > + operating-points-v2: true > + > + devfreq-events: > + description: Phandle of PMU node > + $ref: "/schemas/types.yaml#/definitions/phandle" > + > +required: > + - reg > + - compatible > + - clocks > + - clock-names > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/clock/imx8mm-clock.h> > + ddrc: dram-controller@3d400000 { > + compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc"; > + reg = <0x3d400000 0x400000>; > + clock-names = "dram_core", "dram_pll", "dram_alt", "dram_apb"; > + clocks = <&clk IMX8MM_CLK_DRAM_CORE>, > + <&clk IMX8MM_DRAM_PLL>, > + <&clk IMX8MM_CLK_DRAM_ALT>, > + <&clk IMX8MM_CLK_DRAM_APB>; > + operating-points-v2 = <&ddrc_opp_table>; > + }; > -- > 2.17.1 >
On 05.11.2019 00:21, Rob Herring wrote: > On Thu, Oct 31, 2019 at 11:50:24PM +0200, Leonard Crestez wrote: >> Add devicetree bindings for the i.MX DDR Controller on imx8m series >> chips. It supports dynamic frequency switching between multiple data >> rates and this is exposed to Linux via the devfreq subsystem. >> >> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> >> --- >> .../devicetree/bindings/devfreq/imx-ddrc.yaml | 60 +++++++++++++++++++ > > .../bindings/memory-controllers/ Okay, but I'm not sure about the rules here. Usually there is a 1:1 mapping between subsystems and bindings directory but I guess devfreq is odd since it's not really a physical class of device. I saw there is also a drivers/memory and there is already a devfreq-using driver in there (EXYNOS5422_DMC). It's not clear if my driver fits in there; as far as I can see the only "core" functionality in drivers/memory is parsing DDR timings from DTS but for imx8m this is all controlled in firmware. >> 1 file changed, 60 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml >> >> diff --git a/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml >> new file mode 100644 >> index 000000000000..31db204e6845 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml >> @@ -0,0 +1,60 @@ >> +# SPDX-License-Identifier: GPL-2.0 > > For new bindings: > > # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > >> +%YAML 1.2 >> +--- >> +$id: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fdevfreq%2Fimx-devfreq.yaml%23&data=02%7C01%7Cleonard.crestez%40nxp.com%7Cba47e72161764d5a969a08d761755736%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C637085028918247356&sdata=2DjKgyATOPu7qhzpOCfRrmUM0%2FSAQrV9R7AxZxib8gk%3D&reserved=0 > > Run 'make dt_binding_check'. This will fail as the filename doesn't > match. > >> +$schema: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23&data=02%7C01%7Cleonard.crestez%40nxp.com%7Cba47e72161764d5a969a08d761755736%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C637085028918247356&sdata=EbyVK2ZF6Z22vE%2F4LfIVv0S1LoMe7%2BxhM43H1i8nxtE%3D&reserved=0 >> + >> +title: i.MX DDR Controller > > Perhaps i.MX8x as it's not all i.MX chips. And the filename too? Ok, will rename to imx8m-ddrc since it's not even for all imx8. >> + >> +maintainers: >> + - Leonard Crestez <leonard.crestez@nxp.com> >> + >> +properties: >> + compatible: >> + items: >> + - enum: >> + - fsl,imx8mn-ddrc >> + - fsl,imx8mm-ddrc >> + - fsl,imx8mq-ddrc >> + - const: fsl,imx8m-ddrc >> + >> + reg: >> + maxItems: 1 >> + >> + clocks: >> + maxItems: 4 >> + >> + clock-names: >> + items: >> + - const: dram_core >> + - const: dram_pll >> + - const: dram_alt >> + - const: dram_apb > > Drop 'dram_' OK >> + >> + operating-points-v2: true >> + >> + devfreq-events: >> + description: Phandle of PMU node >> + $ref: "/schemas/types.yaml#/definitions/phandle" >> + >> +required: >> + - reg >> + - compatible >> + - clocks >> + - clock-names >> + >> +additionalProperties: false >> + >> +examples: >> + - | >> + #include <dt-bindings/clock/imx8mm-clock.h> >> + ddrc: dram-controller@3d400000 { >> + compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc"; >> + reg = <0x3d400000 0x400000>; >> + clock-names = "dram_core", "dram_pll", "dram_alt", "dram_apb"; >> + clocks = <&clk IMX8MM_CLK_DRAM_CORE>, >> + <&clk IMX8MM_DRAM_PLL>, >> + <&clk IMX8MM_CLK_DRAM_ALT>, >> + <&clk IMX8MM_CLK_DRAM_APB>; >> + operating-points-v2 = <&ddrc_opp_table>; >> + };
On Tue, Nov 05, 2019 at 07:25:57PM +0000, Leonard Crestez wrote: > On 05.11.2019 00:21, Rob Herring wrote: > > On Thu, Oct 31, 2019 at 11:50:24PM +0200, Leonard Crestez wrote: > >> Add devicetree bindings for the i.MX DDR Controller on imx8m series > >> chips. It supports dynamic frequency switching between multiple data > >> rates and this is exposed to Linux via the devfreq subsystem. > >> > >> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> > >> --- > >> .../devicetree/bindings/devfreq/imx-ddrc.yaml | 60 +++++++++++++++++++ > > > > .../bindings/memory-controllers/ > > Okay, but I'm not sure about the rules here. Usually there is a 1:1 > mapping between subsystems and bindings directory but I guess devfreq is > odd since it's not really a physical class of device. Mostly true, but it's not completely 1:1. > I saw there is also a drivers/memory and there is already a > devfreq-using driver in there (EXYNOS5422_DMC). Yeah, well it's been a while since I last tried to clean up locations of things. DDR controller bindings are not in the best shape. > It's not clear if my driver fits in there; as far as I can see the only > "core" functionality in drivers/memory is parsing DDR timings from DTS > but for imx8m this is all controlled in firmware. You shouldn't have to think about that. Bindings should be for DDR controllers regardless of whether there's a driver for devfreq, EDAC, perf, or ??? or all of those. Rob
diff --git a/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml new file mode 100644 index 000000000000..31db204e6845 --- /dev/null +++ b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml @@ -0,0 +1,60 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/devfreq/imx-devfreq.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: i.MX DDR Controller + +maintainers: + - Leonard Crestez <leonard.crestez@nxp.com> + +properties: + compatible: + items: + - enum: + - fsl,imx8mn-ddrc + - fsl,imx8mm-ddrc + - fsl,imx8mq-ddrc + - const: fsl,imx8m-ddrc + + reg: + maxItems: 1 + + clocks: + maxItems: 4 + + clock-names: + items: + - const: dram_core + - const: dram_pll + - const: dram_alt + - const: dram_apb + + operating-points-v2: true + + devfreq-events: + description: Phandle of PMU node + $ref: "/schemas/types.yaml#/definitions/phandle" + +required: + - reg + - compatible + - clocks + - clock-names + +additionalProperties: false + +examples: + - | + #include <dt-bindings/clock/imx8mm-clock.h> + ddrc: dram-controller@3d400000 { + compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc"; + reg = <0x3d400000 0x400000>; + clock-names = "dram_core", "dram_pll", "dram_alt", "dram_apb"; + clocks = <&clk IMX8MM_CLK_DRAM_CORE>, + <&clk IMX8MM_DRAM_PLL>, + <&clk IMX8MM_CLK_DRAM_ALT>, + <&clk IMX8MM_CLK_DRAM_APB>; + operating-points-v2 = <&ddrc_opp_table>; + };
Add devicetree bindings for the i.MX DDR Controller on imx8m series chips. It supports dynamic frequency switching between multiple data rates and this is exposed to Linux via the devfreq subsystem. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> --- .../devicetree/bindings/devfreq/imx-ddrc.yaml | 60 +++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml