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microchip,xec-qmspi

Vendor: Microchip Technology Inc.

Description

These nodes are “spi” bus nodes.

Microchip XEC QMSPI controller

Properties

Properties not inherited from the base binding file.

Name

Type

Details

port_sel

int

 
SPI Port 0 or 1.

This property is required.

rxdma

int

 
Receive DMA channel

This property is required.

txdma

int

 
Transmit DMA channel

This property is required.

lines

int

 
QMSPI lines 1, 2, or 4

This property is required.

chip_select

int

 
Use QMSPI CS0# or CS1#

This property is required.

dcsckon

int

 
Delay in system clocks from CS# assertion to first clock edge

This property is required.

dckcsoff

int

 
Delay in system clocks from last clock edge to CS# de-assertion

This property is required.

dldh

int

 
Delay in system clocks from CS# de-assertion to driving HOLD# and WP#

This property is required.

dcsda

int

 
Delay in system clocks from CS# de-assertion to CS# assertion

This property is required.

clock-frequency

int

 
Clock frequency the SPI peripheral is being driven at, in Hz.

cs-gpios

phandle-array

 
An array of chip select GPIOs to use. Each element
in the array specifies a GPIO. The index in the array
corresponds to the child node that the CS gpio controls.

Example:

  spi@... {
          cs-gpios = <&gpio0 23 GPIO_ACTIVE_LOW>,
                        <&gpio1 10 GPIO_ACTIVE_LOW>,
                        ...;

          spi-device@0 {
                  reg = <0>;
                  ...
          };
          spi-device@1 {
                  reg = <1>;
                  ...
          };
          ...
  };

The child node "spi-device@0" specifies a SPI device with
chip select controller gpio0, pin 23, and devicetree
GPIO flags GPIO_ACTIVE_LOW. Similarly, "spi-device@1" has CS GPIO
controller gpio1, pin 10, and flags GPIO_ACTIVE_LOW. Additional
devices can be configured in the same way.

If unsure about the flags cell, GPIO_ACTIVE_LOW is generally a safe
choice for a typical "CSn" pin. GPIO_ACTIVE_HIGH may be used if
intervening hardware inverts the signal to the peripheral device or
the line itself is active high.

If this property is not defined, no chip select GPIOs are set.
SPI controllers with dedicated CS pins do not need to define
the cs-gpios property.