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-Qualcomm Universal Peripheral (QUP) Serial Peripheral Interface (SPI)
-
-The QUP core is an AHB slave that provides a common data path (an output FIFO
-and an input FIFO) for serial peripheral interface (SPI) mini-core.
-
-SPI in master mode supports up to 50MHz, up to four chip selects, programmable
-data path from 4 bits to 32 bits and numerous protocol variants.
-
-Required properties:
-- compatible: Should contain:
- "qcom,spi-qup-v1.1.1" for 8660, 8960 and 8064.
- "qcom,spi-qup-v2.1.1" for 8974 and later
- "qcom,spi-qup-v2.2.1" for 8974 v2 and later.
-
-- reg: Should contain base register location and length
-- interrupts: Interrupt number used by this controller
-
-- clocks: Should contain the core clock and the AHB clock.
-- clock-names: Should be "core" for the core clock and "iface" for the
- AHB clock.
-
-- #address-cells: Number of cells required to define a chip select
- address on the SPI bus. Should be set to 1.
-- #size-cells: Should be zero.
-
-Optional properties:
-- spi-max-frequency: Specifies maximum SPI clock frequency,
- Units - Hz. Definition as per
- Documentation/devicetree/bindings/spi/spi-bus.txt
-- num-cs: total number of chipselects
-- cs-gpios: should specify GPIOs used for chipselects.
- The gpios will be referred to as reg = <index> in the SPI child
- nodes. If unspecified, a single SPI device without a chip
- select can be used.
-
-- dmas: Two DMA channel specifiers following the convention outlined
- in bindings/dma/dma.txt
-- dma-names: Names for the dma channels, if present. There must be at
- least one channel named "tx" for transmit and named "rx" for
- receive.
-
-SPI slave nodes must be children of the SPI master node and can contain
-properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
-
-Example:
-
- spi_8: spi@f9964000 { /* BLSP2 QUP2 */
-
- compatible = "qcom,spi-qup-v2";
- #address-cells = <1>;
- #size-cells = <0>;
- reg = <0xf9964000 0x1000>;
- interrupts = <0 102 0>;
- spi-max-frequency = <19200000>;
-
- clocks = <&gcc GCC_BLSP2_QUP2_SPI_APPS_CLK>, <&gcc GCC_BLSP2_AHB_CLK>;
- clock-names = "core", "iface";
-
- dmas = <&blsp1_bam 13>, <&blsp1_bam 12>;
- dma-names = "rx", "tx";
-
- pinctrl-names = "default";
- pinctrl-0 = <&spi8_default>;
-
- device@0 {
- compatible = "arm,pl022-dummy";
- #address-cells = <1>;
- #size-cells = <1>;
- reg = <0>; /* Chip select 0 */
- spi-max-frequency = <19200000>;
- spi-cpol;
- };
-
- device@1 {
- compatible = "arm,pl022-dummy";
- #address-cells = <1>;
- #size-cells = <1>;
- reg = <1>; /* Chip select 1 */
- spi-max-frequency = <9600000>;
- spi-cpha;
- };
-
- device@2 {
- compatible = "arm,pl022-dummy";
- #address-cells = <1>;
- #size-cells = <1>;
- reg = <2>; /* Chip select 2 */
- spi-max-frequency = <19200000>;
- spi-cpol;
- spi-cpha;
- };
-
- device@3 {
- compatible = "arm,pl022-dummy";
- #address-cells = <1>;
- #size-cells = <1>;
- reg = <3>; /* Chip select 3 */
- spi-max-frequency = <19200000>;
- spi-cpol;
- spi-cpha;
- spi-cs-high;
- };
- };