Documentation/devicetree/bindings/memory-controllers/fsl/imx8m-ddrc.yaml

   1 # SPDX-License-Identifier: GPL-2.0
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/memory-controllers/fsl/imx8m-ddrc.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: i.MX8M DDR Controller
   8
   9 maintainers:
  10   - Leonard Crestez <leonard.crestez@nxp.com>
  11
  12 description:
  13   The DDRC block is integrated in i.MX8M for interfacing with DDR based
  14   memories.
  15
  16   It supports switching between different frequencies at runtime but during
  17   this process RAM itself becomes briefly inaccessible so actual frequency
  18   switching is implemented by TF-A code which runs from a SRAM area.
  19
  20   The Linux driver for the DDRC doesn't even map registers (they're included
  21   for the sake of "describing hardware"), it mostly just exposes firmware
  22   capabilities through standard Linux mechanism like devfreq and OPP tables.
  23
  24 properties:
  25   compatible:
  26     items:
  27       - enum:
  28         - fsl,imx8mn-ddrc
  29         - fsl,imx8mm-ddrc
  30         - fsl,imx8mq-ddrc
  31       - const: fsl,imx8m-ddrc
  32
  33   reg:
  34     maxItems: 1
  35     description:
  36       Base address and size of DDRC CTL area.
  37       This is not currently mapped by the imx8m-ddrc driver.
  38
  39   clocks:
  40     maxItems: 4
  41
  42   clock-names:
  43     items:
  44       - const: core
  45       - const: pll
  46       - const: alt
  47       - const: apb
  48
  49   operating-points-v2: true
  50   opp-table: true
  51
  52 required:
  53   - reg
  54   - compatible
  55   - clocks
  56   - clock-names
  57
  58 additionalProperties: false
  59
  60 examples:
  61   - |
  62     #include <dt-bindings/clock/imx8mm-clock.h>
  63     ddrc: memory-controller@3d400000 {
  64         compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc";
  65         reg = <0x3d400000 0x400000>;
  66         clock-names = "core", "pll", "alt", "apb";
  67         clocks = <&clk IMX8MM_CLK_DRAM_CORE>,
  68                  <&clk IMX8MM_DRAM_PLL>,
  69                  <&clk IMX8MM_CLK_DRAM_ALT>,
  70                  <&clk IMX8MM_CLK_DRAM_APB>;
  71         operating-points-v2 = <&ddrc_opp_table>;
  72     };