From db117f5f424829d54db32b1eddbb54b881a4f2e5 Mon Sep 17 00:00:00 2001 From: Girish Mahadevan Date: Tue, 2 Oct 2018 14:47:07 -0700 Subject: [PATCH] spi: Qualcomm Quad SPI(QSPI) documentation Bindings for Qualcomm Quad SPI used on SoCs such as sdm845. Signed-off-by: Girish Mahadevan Signed-off-by: Ryan Case Reviewed-by: Douglas Anderson Reviewed-by: Rob Herring Reviewed-by: Stephen Boyd Signed-off-by: Mark Brown --- .../devicetree/bindings/spi/qcom,spi-qcom-qspi.txt | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt new file mode 100644 index 0000000..1d64b61 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt @@ -0,0 +1,36 @@ +Qualcomm Quad Serial Peripheral Interface (QSPI) + +The QSPI controller allows SPI protocol communication in single, dual, or quad +wire transmission modes for read/write access to slaves such as NOR flash. + +Required properties: +- compatible: An SoC specific identifier followed by "qcom,qspi-v1", such as + "qcom,sdm845-qspi", "qcom,qspi-v1" +- reg: Should contain the base register location and length. +- interrupts: Interrupt number used by the controller. +- clocks: Should contain the core and AHB clock. +- clock-names: Should be "core" for core clock and "iface" for AHB clock. + +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: + + qspi: spi@88df000 { + compatible = "qcom,sdm845-qspi", "qcom,qspi-v1"; + reg = <0x88df000 0x600>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = ; + clock-names = "iface", "core"; + clocks = <&gcc GCC_QSPI_CNOC_PERIPH_AHB_CLK>, + <&gcc GCC_QSPI_CORE_CLK>; + + flash@0 { + compatible = "jedec,spi-nor"; + reg = <0>; + spi-max-frequency = <25000000>; + spi-tx-bus-width = <2>; + spi-rx-bus-width = <2>; + }; + }; -- 2.7.4