# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) %YAML 1.2 --- $id: http://devicetree.org/schemas/mmc/arm,pl18x.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: ARM PrimeCell MultiMedia Card Interface (MMCI) PL180 and PL181 maintainers: - Linus Walleij - Ulf Hansson description: The ARM PrimeCells MMCI PL180 and PL181 provides an interface for reading and writing to MultiMedia and SD cards alike. Over the years vendors have use the VHDL code from ARM to create derivative MMC/SD/SDIO host controllers with very similar characteristics. allOf: - $ref: /schemas/arm/primecell.yaml# - $ref: mmc-controller.yaml# # We need a select here so we don't match all nodes with 'arm,primecell' select: properties: compatible: contains: enum: - arm,pl180 - arm,pl181 - arm,pl18x required: - compatible properties: compatible: oneOf: - description: The first version of the block, simply called PL180 and found in the ARM Integrator IM/PD1 logic module. items: - const: arm,pl180 - const: arm,primecell - description: The improved version of the block, found in the ARM Versatile and later reference designs. Further revisions exist but get detected at runtime by reading some magic numbers in the PrimeCell ID registers. items: - const: arm,pl181 - const: arm,primecell - description: Wildcard entry that will let the operating system inspect the PrimeCell ID registers to determine which hardware variant of PL180 or PL181 this is. items: - const: arm,pl18x - const: arm,primecell clocks: description: One or two clocks, the "apb_pclk" and the "MCLK" which is the core block clock. The names are not compulsory. minItems: 1 maxItems: 2 power-domains: true resets: maxItems: 1 reg: description: the MMIO memory window must be exactly 4KB (0x1000) and the layout should provide the PrimeCell ID registers so that the device can be discovered. On ST Micro variants, a second register window may be defined if a delay block is present and used for tuning. interrupts: description: The first interrupt is the command interrupt and corresponds to the event at the end of a command. The second interrupt is the PIO (polled I/O) interrupt and occurs when the FIFO needs to be emptied as part of a bulk read from the card. Some variants have these two interrupts wired into the same line (logic OR) and in that case only one interrupt may be provided. minItems: 1 maxItems: 2 st,sig-dir-dat0: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, bus signal direction pins used for DAT[0]. st,sig-dir-dat2: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, bus signal direction pins used for DAT[2]. st,sig-dir-dat31: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, bus signal direction pins used for DAT[3] and DAT[1]. st,sig-dir-dat74: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, bus signal direction pins used for DAT[7] and DAT[4]. st,sig-dir-cmd: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, CMD signal direction used for pin CMD. st,sig-pin-fbclk: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, feedback clock FBCLK signal pin in use. st,sig-dir: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, signal direction polarity used for pins CMD, DAT[0], DAT[1], DAT[2] and DAT[3]. st,neg-edge: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, data and command phase relation, generated on the sd clock falling edge. st,use-ckin: $ref: /schemas/types.yaml#/definitions/flag description: ST Micro-specific property, use CKIN pin from an external driver to sample the receive data (for example with a voltage switch transceiver). st,cmd-gpios: maxItems: 1 description: The GPIO matching the CMD pin. st,ck-gpios: maxItems: 1 description: The GPIO matching the CK pin. st,ckin-gpios: maxItems: 1 description: The GPIO matching the CKIN pin. dependencies: st,cmd-gpios: [ "st,use-ckin" ] st,ck-gpios: [ "st,use-ckin" ] st,ckin-gpios: [ "st,use-ckin" ] unevaluatedProperties: false required: - compatible - reg - interrupts examples: - | #include #include mmc@5000 { compatible = "arm,pl180", "arm,primecell"; reg = <0x5000 0x1000>; interrupts-extended = <&vic 22 &sic 1>; clocks = <&xtal24mhz>, <&pclk>; clock-names = "mclk", "apb_pclk"; }; - | #include mmc@80126000 { compatible = "arm,pl18x", "arm,primecell"; reg = <0x80126000 0x1000>; interrupts = <0 60 IRQ_TYPE_LEVEL_HIGH>; dmas = <&dma 29 0 0x2>, <&dma 29 0 0x0>; dma-names = "rx", "tx"; clocks = <&prcc_kclk 1 5>, <&prcc_pclk 1 5>; clock-names = "sdi", "apb_pclk"; max-frequency = <100000000>; bus-width = <4>; cap-sd-highspeed; cap-mmc-highspeed; cd-gpios = <&gpio2 31 0x4>; st,sig-dir-dat0; st,sig-dir-dat2; st,sig-dir-cmd; st,sig-pin-fbclk; vmmc-supply = <&ab8500_ldo_aux3_reg>; vqmmc-supply = <&vmmci>; }; - | mmc@101f6000 { compatible = "arm,pl18x", "arm,primecell"; reg = <0x101f6000 0x1000>; clocks = <&sdiclk>, <&pclksdi>; clock-names = "mclk", "apb_pclk"; interrupts = <22>; max-frequency = <400000>; bus-width = <4>; cap-mmc-highspeed; cap-sd-highspeed; full-pwr-cycle; st,sig-dir-dat0; st,sig-dir-dat2; st,sig-dir-dat31; st,sig-dir-cmd; st,sig-pin-fbclk; vmmc-supply = <&vmmc_regulator>; }; - | mmc@52007000 { compatible = "arm,pl18x", "arm,primecell"; arm,primecell-periphid = <0x10153180>; reg = <0x52007000 0x1000>; interrupts = <49>; interrupt-names = "cmd_irq"; clocks = <&rcc 0>; clock-names = "apb_pclk"; resets = <&rcc 1>; cap-sd-highspeed; cap-mmc-highspeed; max-frequency = <120000000>; };