xref: /linux/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml (revision 45d8b572fac3aa8b49d53c946b3685eaf78a2824) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/mmc/arm,pl18x.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ARM PrimeCell MultiMedia Card Interface (MMCI) PL180 and PL181
8
9maintainers:
10  - Linus Walleij <linus.walleij@linaro.org>
11  - Ulf Hansson <ulf.hansson@linaro.org>
12
13description:
14  The ARM PrimeCells MMCI PL180 and PL181 provides an interface for
15  reading and writing to MultiMedia and SD cards alike. Over the years
16  vendors have use the VHDL code from ARM to create derivative MMC/SD/SDIO
17  host controllers with very similar characteristics.
18
19allOf:
20  - $ref: /schemas/arm/primecell.yaml#
21  - $ref: mmc-controller.yaml#
22
23# We need a select here so we don't match all nodes with 'arm,primecell'
24select:
25  properties:
26    compatible:
27      contains:
28        enum:
29          - arm,pl180
30          - arm,pl181
31          - arm,pl18x
32  required:
33    - compatible
34
35properties:
36  compatible:
37    oneOf:
38      - description: The first version of the block, simply called
39          PL180 and found in the ARM Integrator IM/PD1 logic module.
40        items:
41          - const: arm,pl180
42          - const: arm,primecell
43      - description: The improved version of the block, found in the
44          ARM Versatile and later reference designs. Further revisions
45          exist but get detected at runtime by reading some magic numbers
46          in the PrimeCell ID registers.
47        items:
48          - const: arm,pl181
49          - const: arm,primecell
50      - description: Wildcard entry that will let the operating system
51          inspect the PrimeCell ID registers to determine which hardware
52          variant of PL180 or PL181 this is.
53        items:
54          - const: arm,pl18x
55          - const: arm,primecell
56      - description: Entries for STMicroelectronics variant of PL18x.
57        items:
58          - enum:
59              - st,stm32-sdmmc2
60              - st,stm32mp25-sdmmc2
61          - const: arm,pl18x
62          - const: arm,primecell
63
64  clocks:
65    description: One or two clocks, the "apb_pclk" and the "MCLK"
66      which is the core block clock. The names are not compulsory.
67    minItems: 1
68    maxItems: 2
69
70  dmas:
71    maxItems: 2
72
73  dma-names:
74    oneOf:
75      - items:
76          - const: tx
77          - const: rx
78      - items:
79          - const: rx
80          - const: tx
81
82  power-domains: true
83
84  resets:
85    maxItems: 1
86
87  reg:
88    description: the MMIO memory window must be exactly 4KB (0x1000) and the
89      layout should provide the PrimeCell ID registers so that the device can
90      be discovered. On ST Micro variants, a second register window may be
91      defined if a delay block is present and used for tuning.
92
93  interrupts:
94    description: The first interrupt is the command interrupt and corresponds
95      to the event at the end of a command. The second interrupt is the
96      PIO (polled I/O) interrupt and occurs when the FIFO needs to be
97      emptied as part of a bulk read from the card. Some variants have these
98      two interrupts wired into the same line (logic OR) and in that case
99      only one interrupt may be provided. The interrupt-names property is
100      not used due to inconsistency of existing DTs regarding its content.
101    deprecated: false
102    minItems: 1
103    maxItems: 2
104
105  st,sig-dir-dat0:
106    $ref: /schemas/types.yaml#/definitions/flag
107    description: ST Micro-specific property, bus signal direction pins used for
108      DAT[0].
109
110  st,sig-dir-dat2:
111    $ref: /schemas/types.yaml#/definitions/flag
112    description: ST Micro-specific property, bus signal direction pins used for
113      DAT[2].
114
115  st,sig-dir-dat31:
116    $ref: /schemas/types.yaml#/definitions/flag
117    description: ST Micro-specific property, bus signal direction pins used for
118      DAT[3] and DAT[1].
119
120  st,sig-dir-dat74:
121    $ref: /schemas/types.yaml#/definitions/flag
122    description: ST Micro-specific property, bus signal direction pins used for
123      DAT[7] and DAT[4].
124
125  st,sig-dir-cmd:
126    $ref: /schemas/types.yaml#/definitions/flag
127    description: ST Micro-specific property, CMD signal direction used for
128      pin CMD.
129
130  st,sig-pin-fbclk:
131    $ref: /schemas/types.yaml#/definitions/flag
132    description: ST Micro-specific property, feedback clock FBCLK signal pin
133      in use.
134
135  st,sig-dir:
136    $ref: /schemas/types.yaml#/definitions/flag
137    description: ST Micro-specific property, signal direction polarity used for
138      pins CMD, DAT[0], DAT[1], DAT[2] and DAT[3].
139
140  st,neg-edge:
141    $ref: /schemas/types.yaml#/definitions/flag
142    description: ST Micro-specific property, data and command phase relation,
143      generated on the sd clock falling edge.
144
145  st,use-ckin:
146    $ref: /schemas/types.yaml#/definitions/flag
147    description: ST Micro-specific property, use CKIN pin from an external
148      driver to sample the receive data (for example with a voltage switch
149      transceiver).
150
151  st,cmd-gpios:
152    maxItems: 1
153    description:
154      The GPIO matching the CMD pin.
155
156  st,ck-gpios:
157    maxItems: 1
158    description:
159      The GPIO matching the CK pin.
160
161  st,ckin-gpios:
162    maxItems: 1
163    description:
164      The GPIO matching the CKIN pin.
165
166dependencies:
167  st,cmd-gpios: [ "st,use-ckin" ]
168  st,ck-gpios: [ "st,use-ckin" ]
169  st,ckin-gpios: [ "st,use-ckin" ]
170
171unevaluatedProperties: false
172
173required:
174  - compatible
175  - reg
176  - interrupts
177
178examples:
179  - |
180    #include <dt-bindings/interrupt-controller/irq.h>
181    #include <dt-bindings/gpio/gpio.h>
182
183    mmc@5000 {
184      compatible = "arm,pl180", "arm,primecell";
185      reg = <0x5000 0x1000>;
186      interrupts-extended = <&vic 22 &sic 1>;
187      clocks = <&xtal24mhz>, <&pclk>;
188      clock-names = "mclk", "apb_pclk";
189    };
190
191  - |
192    #include <dt-bindings/interrupt-controller/irq.h>
193
194    mmc@80126000 {
195      compatible = "arm,pl18x", "arm,primecell";
196      reg = <0x80126000 0x1000>;
197      interrupts = <0 60 IRQ_TYPE_LEVEL_HIGH>;
198      dmas = <&dma 29 0 0x2>, <&dma 29 0 0x0>;
199      dma-names = "rx", "tx";
200      clocks = <&prcc_kclk 1 5>, <&prcc_pclk 1 5>;
201      clock-names = "sdi", "apb_pclk";
202      max-frequency = <100000000>;
203      bus-width = <4>;
204      cap-sd-highspeed;
205      cap-mmc-highspeed;
206      cd-gpios = <&gpio2 31 0x4>;
207      st,sig-dir-dat0;
208      st,sig-dir-dat2;
209      st,sig-dir-cmd;
210      st,sig-pin-fbclk;
211      vmmc-supply = <&ab8500_ldo_aux3_reg>;
212      vqmmc-supply = <&vmmci>;
213    };
214
215  - |
216    mmc@101f6000 {
217      compatible = "arm,pl18x", "arm,primecell";
218      reg = <0x101f6000 0x1000>;
219      clocks = <&sdiclk>, <&pclksdi>;
220      clock-names = "mclk", "apb_pclk";
221      interrupts = <22>;
222      max-frequency = <400000>;
223      bus-width = <4>;
224      cap-mmc-highspeed;
225      cap-sd-highspeed;
226      full-pwr-cycle;
227      st,sig-dir-dat0;
228      st,sig-dir-dat2;
229      st,sig-dir-dat31;
230      st,sig-dir-cmd;
231      st,sig-pin-fbclk;
232      vmmc-supply = <&vmmc_regulator>;
233    };
234
235  - |
236    mmc@52007000 {
237      compatible = "arm,pl18x", "arm,primecell";
238      arm,primecell-periphid = <0x10153180>;
239      reg = <0x52007000 0x1000>;
240      interrupts = <49>;
241      clocks = <&rcc 0>;
242      clock-names = "apb_pclk";
243      resets = <&rcc 1>;
244      cap-sd-highspeed;
245      cap-mmc-highspeed;
246      max-frequency = <120000000>;
247    };
248