4fe57de7df
Configure the quad-spi in DualFlash Mode This property of the stm32 boards will access simultaneously two identical quad-flash external memories connected to 2 quad-spi banks (pins). Dual Flash Mode is possible on stm32 series with QUADSPI_CR_DFM Signed-off-by: Francois Ramu <francois.ramu@st.com>
81 lines
2.5 KiB
YAML
81 lines
2.5 KiB
YAML
# Copyright (c) 2020, Linaro limited
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
|
|
description: |
|
|
STM32 QSPI device representation. A stm32 quadspi node would typically
|
|
looks to this:
|
|
|
|
&quadspi {
|
|
pinctrl-0 = <&quadspi_clk_pe10 &quadspi_ncs_pe11
|
|
&quadspi_bk1_io0_pe12 &quadspi_bk1_io1_pe13
|
|
&quadspi_bk1_io2_pe14 &quadspi_bk1_io3_pe15>;
|
|
|
|
dmas = <&dma1 5 5 0x0000 0x03>;
|
|
dma-names = "tx_rx";
|
|
|
|
status = "okay";
|
|
};
|
|
|
|
compatible: "st,stm32-qspi"
|
|
|
|
include: [base.yaml, pinctrl-device.yaml]
|
|
|
|
bus: qspi
|
|
|
|
properties:
|
|
reg:
|
|
required: true
|
|
|
|
interrupts:
|
|
required: true
|
|
|
|
pinctrl-0:
|
|
required: true
|
|
|
|
pinctrl-names:
|
|
required: true
|
|
|
|
dmas:
|
|
description: |
|
|
Optional DMA channel specifier. If DMA should be used, specifier should
|
|
hold a phandle reference to the dma controller (not the DMAMUX even if present),
|
|
the channel number, the slot number, channel configuration and finally features.
|
|
(depending on the type of DMA: 'features' is optional)
|
|
|
|
When a DMAMUX is present and enabled, the channel is the dma one
|
|
(not dmamux channel). The request is given by the DMAMUX (no 'features' required).
|
|
|
|
For example with DMA 2 for TX/RX on QSPI like stm32l496 (no 'features')
|
|
/* select DMA2 channel 7 request 3 for QUADSPI */
|
|
dmas = <&dma2 7 3 (STM32_DMA_PERIPH_TX | STM32_DMA_PRIORITY_HIGH)>;
|
|
For example with a DMAMUX for TX/RX on QSPI like stm32wb55 (no 'features')
|
|
/* select DMA2 channel 0, request 20 for QUADSPI */
|
|
dmas = <&dma2 0 20 (STM32_DMA_PERIPH_TX | STM32_DMA_PRIORITY_HIGH)>;
|
|
|
|
dma-names:
|
|
description: |
|
|
DMA channel name. If DMA should be used, expected value is "tx_rx".
|
|
|
|
For example
|
|
dma-names = "tx_rx";
|
|
|
|
dual-flash:
|
|
type: boolean
|
|
description: |
|
|
configuration to enable the dual flash mode of the QSPI peripheral
|
|
where two external quad SPI Flash memories (FLASH 1 and FLASH 2) are used
|
|
in order to send/receive 8 bits (or 16 bits in DDR mode) every cycle,
|
|
effectively doubling the throughput as well as the capacity.
|
|
When true, the Flash ID number <flash-id> is useless.
|
|
|
|
flash-id:
|
|
type: int
|
|
description: |
|
|
Flash ID number. This number, if defined, helps to select the right
|
|
QSPI GPIO banks (defined as 'quadspi_bk[1/2]' in pinctrl property)
|
|
to communicate with flash memory.
|
|
Valid only if the <dual-flash> is not set.
|
|
|
|
For example
|
|
flash-id = <2>;
|