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Commit f333a331 authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Grant Likely
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spi/tegra114: add spi driver 



Add SPI driver for NVIDIA's Tegra114 SPI controller. This controller
is different than the older SoCs SPI controller in internal design as
well as register interface.

This driver supports the:
- non DMA based transfer for smaller transfer i.e. less than FIFO depth.
- APB DMA based transfer for larger transfer i.e. more than FIFO depth.
- Clock gating through runtime PM callbacks.
- registration through DT only.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 5e49035e

Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt

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NVIDIA Tegra114 SPI controller.



Required properties:

- compatible : should be "nvidia,tegra114-spi".

- reg: Should contain SPI registers location and length.

- interrupts: Should contain SPI interrupts.

- nvidia,dma-request-selector : The Tegra DMA controller's phandle and

  request selector for this SPI controller.

- This is also require clock named "spi" as per binding document

  Documentation/devicetree/bindings/clock/clock-bindings.txt



Recommended properties:

- spi-max-frequency: Definition as per

                     Documentation/devicetree/bindings/spi/spi-bus.txt

Example:



spi@7000d600 {

	compatible = "nvidia,tegra114-spi";

	reg = <0x7000d600 0x200>;

	interrupts = <0 82 0x04>;

	nvidia,dma-request-selector = <&apbdma 16>;

	spi-max-frequency = <25000000>;

	#address-cells = <1>;

	#size-cells = <0>;

	status = "disabled";

};

drivers/spi/Kconfig

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@@ -415,6 +415,14 @@ config SPI_MXS 
	help

	  SPI driver for Freescale MXS devices.



config SPI_TEGRA114

	tristate "NVIDIA Tegra114 SPI Controller"

	depends on ARCH_TEGRA && TEGRA20_APB_DMA

	help

	  SPI driver for NVIDIA Tegra114 SPI Controller interface. This controller

	  is different than the older SoCs SPI controller and also register interface

	  get changed with this controller.



config SPI_TEGRA20_SFLASH

	tristate "Nvidia Tegra20 Serial flash Controller"

	depends on ARCH_TEGRA

drivers/spi/Makefile

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@@ -65,6 +65,7 @@ obj-$(CONFIG_SPI_SH_HSPI) += spi-sh-hspi.o 
obj-$(CONFIG_SPI_SH_MSIOF)		+= spi-sh-msiof.o

obj-$(CONFIG_SPI_SH_SCI)		+= spi-sh-sci.o

obj-$(CONFIG_SPI_SIRF)		+= spi-sirf.o

obj-$(CONFIG_SPI_TEGRA114)		+= spi-tegra114.o

obj-$(CONFIG_SPI_TEGRA20_SFLASH)	+= spi-tegra20-sflash.o

obj-$(CONFIG_SPI_TEGRA20_SLINK)		+= spi-tegra20-slink.o

obj-$(CONFIG_SPI_TI_SSP)		+= spi-ti-ssp.o

drivers/spi/spi-tegra114.c

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File added.

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