Merge tag 'spi-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "For the most part this is a quiet release for SPI, though there's
  several of the more widely used drivers that have had some fairly
  substantial development done on them, mainly improving performance and
  adding support for some more obscure use cases.

  Summary:

   - Support for configuring a minimum time for chip select to be
     deasserted between transfers from Martin Sperl.

   - A rework of the ACPI device instantiation code from Ard Biesheuvel.

   - Fairly substantial development on the AT91 USART, BCM2835 and
     Tegra114 drivers.

   - New driver for Socionext SynQuacer"

* tag 'spi-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (58 commits)
  spi: pxa2xx: Add support for Intel Elkhart Lake
  spi: atmel-quadspi: fix resume call
  spi: atmel-quadspi: void return type for atmel_qspi_init()
  spi: pxa2xx: Set minimum transfer speed
  spi: stm32-qspi: remove signal sensitive on completion
  dt-bindings: spi: stm32-qspi: add dma properties
  spi: uniphier: fix zero-length transfer
  spi: uniphier: fix timeout error
  spi/acpi: avoid spurious matches during slave enumeration
  spi: spi-stm32-qspi: Remove CR_FTHRES_MASK usage
  spi: fix ctrl->num_chipselect constraint
  spi: spi-synquacer: Fixed build on architectures missing readsl/writesl series
  spi/acpi: fix incorrect ACPI parent check
  spi: don't open code list_for_each_entry_safe_reverse()
  spi: No need to assign dummy value in spi_unregister_controller()
  spi: Add a prototype for exported spi_set_cs_timing()
  spi/acpi: enumerate all SPI slaves in the namespace
  spi: qup: fix PIO/DMA transfers.
  spi: Use struct_size() helper
  spi: mediatek: add SPI_LSB_FIRST support
  ...

1 files changed, 161 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml
new file mode 100644
index 000000000000..876c0623f322
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml
@@ -0,0 +1,161 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spi-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI Controller Generic Binding
+
+maintainers:
+  - Mark Brown <broonie@kernel.org>
+
+description: |
+  SPI busses can be described with a node for the SPI controller device
+  and a set of child nodes for each SPI slave on the bus. The system SPI
+  controller may be described for use in SPI master mode or in SPI slave mode,
+  but not for both at the same time.
+
+properties:
+  $nodename:
+    pattern: "^spi(@.*|-[0-9a-f])*$"
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  cs-gpios:
+    description: |
+      GPIOs used as chip selects.
+      If that property is used, the number of chip selects will be
+      increased automatically with max(cs-gpios, hardware chip selects).
+
+      So if, for example, the controller has 2 CS lines, and the
+      cs-gpios looks like this
+        cs-gpios = <&gpio1 0 0>, <0>, <&gpio1 1 0>, <&gpio1 2 0>;
+
+      Then it should be configured so that num_chipselect = 4, with
+      the following mapping
+        cs0 : &gpio1 0 0
+        cs1 : native
+        cs2 : &gpio1 1 0
+        cs3 : &gpio1 2 0
+
+  num-cs:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Total number of chip selects.
+
+  spi-slave:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      The SPI controller acts as a slave, instead of a master.
+
+patternProperties:
+  "^slave$":
+    type: object
+
+    properties:
+      compatible:
+        description:
+          Compatible of the SPI device.
+
+    required:
+      - compatible
+
+  "^.*@[0-9a-f]+$":
+    type: object
+
+    properties:
+      compatible:
+        description:
+          Compatible of the SPI device.
+
+      reg:
+        maxItems: 1
+        minimum: 0
+        maximum: 256
+        description:
+          Chip select used by the device.
+
+      spi-3wire:
+        $ref: /schemas/types.yaml#/definitions/flag
+        description:
+          The device requires 3-wire mode.
+
+      spi-cpha:
+        $ref: /schemas/types.yaml#/definitions/flag
+        description:
+          The device requires shifted clock phase (CPHA) mode.
+
+      spi-cpol:
+        $ref: /schemas/types.yaml#/definitions/flag
+        description:
+          The device requires inverse clock polarity (CPOL) mode.
+
+      spi-cs-high:
+        $ref: /schemas/types.yaml#/definitions/flag
+        description:
+          The device requires the chip select active high.
+
+      spi-lsb-first:
+        $ref: /schemas/types.yaml#/definitions/flag
+        description:
+          The device requires the LSB first mode.
+
+      spi-max-frequency:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description:
+          Maximum SPI clocking speed of the device in Hz.
+
+      spi-rx-bus-width:
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/uint32
+          - enum: [ 1, 2, 4 ]
+          - default: 1
+        description:
+          Bus width to the SPI bus used for MISO.
+
+      spi-rx-delay-us:
+        description:
+          Delay, in microseconds, after a read transfer.
+
+      spi-tx-bus-width:
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/uint32
+          - enum: [ 1, 2, 4 ]
+          - default: 1
+        description:
+          Bus width to the SPI bus used for MOSI.
+
+      spi-tx-delay-us:
+        description:
+          Delay, in microseconds, after a write transfer.
+
+    required:
+      - compatible
+      - reg
+
+examples:
+  - |
+    spi@f00 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "fsl,mpc5200b-spi","fsl,mpc5200-spi";
+        reg = <0xf00 0x20>;
+        interrupts = <2 13 0 2 14 0>;
+        interrupt-parent = <&mpc5200_pic>;
+
+        ethernet-switch@0 {
+            compatible = "micrel,ks8995m";
+            spi-max-frequency = <1000000>;
+            reg = <0>;
+        };
+
+        codec@1 {
+            compatible = "ti,tlv320aic26";
+            spi-max-frequency = <100000>;
+            reg = <1>;
+        };
+    };