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Wysocki" , Kyungmin Park , kernel@pengutronix.de, Fabio Estevam , Shawn Guo , Georgi Djakov Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Leonard, On 11/15/19 3:33 AM, 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 > --- > .../memory-controllers/fsl/imx8m-ddrc.yaml | 72 +++++++++++++++++++ > 1 file changed, 72 insertions(+) > create mode 100644 Documentation/devicetree/bindings/memory-controllers/fsl/imx8m-ddrc.yaml > > diff --git a/Documentation/devicetree/bindings/memory-controllers/fsl/imx8m-ddrc.yaml b/Documentation/devicetree/bindings/memory-controllers/fsl/imx8m-ddrc.yaml > new file mode 100644 > index 000000000000..c9e6c22cb5be > --- /dev/null > +++ b/Documentation/devicetree/bindings/memory-controllers/fsl/imx8m-ddrc.yaml > @@ -0,0 +1,72 @@ > +# SPDX-License-Identifier: GPL-2.0 > +%YAML 1.2 > +--- > +$id: https://protect2.fireeye.com/url?k=7d43eac6-20dfeba6-7d426189-0cc47a31307c-fcd69516893e0615&u=http://devicetree.org/schemas/memory-controllers/fsl/imx8m-ddrc.yaml# > +$schema: https://protect2.fireeye.com/url?k=b9d87e43-e4447f23-b9d9f50c-0cc47a31307c-9fbd3b55b25cfa6d&u=http://devicetree.org/meta-schemas/core.yaml# > + > +title: i.MX8M DDR Controller > + > +maintainers: > + - Leonard Crestez > + > +description: > + The DDRC block is integrated in i.MX8M for interfacing with DDR based > + memories. > + > + It supports switching between different frequencies at runtime but during > + this process RAM itself becomes briefly inaccessible so actual frequency > + switching is implemented by TF-A code which runs from a SRAM area. > + > + The Linux driver for the DDRC doesn't even map registers (they're included > + for the sake of "describing hardware"), it mostly just exposes firmware > + capabilities through standard Linux mechanism like devfreq and OPP tables. > + > +properties: > + compatible: > + items: > + - enum: > + - fsl,imx8mn-ddrc > + - fsl,imx8mm-ddrc > + - fsl,imx8mq-ddrc > + - const: fsl,imx8m-ddrc > + > + reg: > + maxItems: 1 > + description: > + Base address and size of DDRC CTL area. > + This is not currently mapped by the imx8m-ddrc driver. > + > + clocks: > + maxItems: 4 > + > + clock-names: > + items: > + - const: core > + - const: pll > + - const: alt > + - const: apb > + > + operating-points-v2: true > + opp-table: true > + > +required: > + - reg > + - compatible > + - clocks > + - clock-names > + > +additionalProperties: false > + > +examples: > + - | > + #include > + ddrc: memory-controller@3d400000 { > + compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc"; > + reg = <0x3d400000 0x400000>; > + clock-names = "core", "pll", "alt", "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>; > + }; > Acked-by: Chanwoo Choi -- Best Regards, Chanwoo Choi Samsung Electronics _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel