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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/mtd/st,spi-fsm.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: STMicroelectronics SPI FSM Serial NOR Flash Controller
maintainers:
- Angus Clark <angus.clark@st.com>
description:
The STMicroelectronics Fast Sequence Mode (FSM) controller is a dedicated
hardware accelerator integrated in older STiH4xx/STiDxxx set-top box SoCs
(such as STiH407, STiH416, STiD127). It connects directly to a single
external serial flash device used as the primary boot device. The FSM
executes hard-coded or configurable instruction sequences in hardware,
providing low-latency reads suitable for execute-in-place (XIP) boot
and high read bandwidth.
properties:
compatible:
const: st,spi-fsm
reg:
maxItems: 1
reg-names:
const: spi-fsm
interrupts:
maxItems: 1
st,syscfg:
$ref: /schemas/types.yaml#/definitions/phandle
description: Phandle to the system configuration registers used for boot-device selection.
st,boot-device-reg:
$ref: /schemas/types.yaml#/definitions/uint32
description: Offset of the boot-device register within the st,syscfg node.
st,boot-device-spi:
$ref: /schemas/types.yaml#/definitions/uint32
description: Expected boot-device value when booting from this SPI controller.
required:
- compatible
- reg
- reg-names
- interrupts
- pinctrl-0
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
spifsm@fe902000 {
compatible = "st,spi-fsm";
reg = <0xfe902000 0x1000>;
reg-names = "spi-fsm";
interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
pinctrl-0 = <&pinctrl_fsm>;
st,syscfg = <&syscfg_rear>;
st,boot-device-reg = <0x958>;
st,boot-device-spi = <0x1a>;
};
...
|
