cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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spi-mux.yaml (2756B)

      1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
      2%YAML 1.2
      3---
      4$id: http://devicetree.org/schemas/spi/spi-mux.yaml#
      5$schema: http://devicetree.org/meta-schemas/core.yaml#
      6
      7title: Generic SPI Multiplexer
      8
      9description: |
     10  This binding describes a SPI bus multiplexer to route the SPI chip select
     11  signals. This can be used when you need more devices than the SPI controller
     12  has chip selects available. An example setup is shown in ASCII art; the actual
     13  setting of the multiplexer to a channel needs to be done by a specific SPI mux
     14  driver.
     15
     16        MOSI /--------------------------------+--------+--------+--------\
     17        MISO |/------------------------------+|-------+|-------+|-------\|
     18         SCL ||/----------------------------+||------+||------+||------\||
     19             |||                            |||      |||      |||      |||
     20      +------------+                        |||      |||      |||      |||
     21      | SoC  |||   |                      +-+++-+  +-+++-+  +-+++-+  +-+++-+
     22      |      |||   |                      | dev |  | dev |  | dev |  | dev |
     23      |   +--+++-+ | CS-X  +------+\      +--+--+  +--+--+  +--+--+  +--+--+
     24      |   | SPI  +-|-------+ Mux  |\\   CS-0 |        |        |        |
     25      |   +------+ |       +--+---+\\\-------/   CS-1 |        |        |
     26      |            |          |    \\\----------------/   CS-2 |        |
     27      |   +------+ |          |     \\-------------------------/   CS-3 |
     28      |   | ?    +-|----------/      \----------------------------------/
     29      |   +------+ |
     30      +------------+
     31
     32allOf:
     33  - $ref: "/schemas/spi/spi-controller.yaml#"
     34  - $ref: "/schemas/spi/spi-peripheral-props.yaml#"
     35
     36maintainers:
     37  - Chris Packham <chris.packham@alliedtelesis.co.nz>
     38
     39properties:
     40  compatible:
     41    const: spi-mux
     42
     43  mux-controls:
     44    maxItems: 1
     45
     46required:
     47  - compatible
     48  - reg
     49  - spi-max-frequency
     50  - mux-controls
     51
     52unevaluatedProperties: false
     53
     54examples:
     55  - |
     56    #include <dt-bindings/gpio/gpio.h>
     57    mux: mux-controller {
     58        compatible = "gpio-mux";
     59        #mux-control-cells = <0>;
     60
     61        mux-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
     62    };
     63
     64    spi {
     65        #address-cells = <1>;
     66        #size-cells = <0>;
     67        spi@0 {
     68            compatible = "spi-mux";
     69            reg = <0>;
     70            #address-cells = <1>;
     71            #size-cells = <0>;
     72            spi-max-frequency = <100000000>;
     73
     74            mux-controls = <&mux>;
     75
     76            flash@0 {
     77                compatible = "jedec,spi-nor";
     78                reg = <0>;
     79                spi-max-frequency = <40000000>;
     80            };
     81
     82            sensor@1 {
     83                compatible = "bosch,bme680";
     84                reg = <1>;
     85                spi-max-frequency = <10000000>;
     86            };
     87        };
     88    };