linux-kernel - [PATCH] dt-bindings: mtd: st,spi-fsm: convert to DT schema

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Message-Id: <20260105-st-fsm-v1-1-d1dd935ccee4@gmail.com>
Date: Mon, 05 Jan 2026 16:07:59 +0000
From: Akhila YS <akhilayalmati@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Akhila YS <akhilayalmati@...il.com>
Subject: [PATCH] dt-bindings: mtd: st,spi-fsm: convert to DT schema

Convert STMicroelectronics SPI FSM Serial NOR Flash Controller binding
to YAML format.

Signed-off-by: Akhila YS <akhilayalmati@...il.com>
---
 .../devicetree/bindings/mtd/st,spi-fsm.yaml        | 72 ++++++++++++++++++++++
 Documentation/devicetree/bindings/mtd/st-fsm.txt   | 25 --------
 2 files changed, 72 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/mtd/st,spi-fsm.yaml b/Documentation/devicetree/bindings/mtd/st,spi-fsm.yaml
new file mode 100644
index 000000000000..f374c6aaa185
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/st,spi-fsm.yaml
@@ -0,0 +1,72 @@
+# 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:
+  - Miquel Raynal <miquel.raynal@...tlin.com>
+  - Richard Weinberger <richard@....at>
+
+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
+
+  pinctrl-0:
+    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@...02000 {
+        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>;
+    };
+...
diff --git a/Documentation/devicetree/bindings/mtd/st-fsm.txt b/Documentation/devicetree/bindings/mtd/st-fsm.txt
deleted file mode 100644
index 54cef9ef3083..000000000000
--- a/Documentation/devicetree/bindings/mtd/st-fsm.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-* ST-Microelectronics SPI FSM Serial (NOR) Flash Controller
-
-Required properties:
-  - compatible : Should be "st,spi-fsm"
-  - reg        : Contains register's location and length.
-  - reg-names  : Should contain the reg names "spi-fsm"
-  - interrupts : The interrupt number
-  - pinctrl-0  : Standard Pinctrl phandle (see: pinctrl/pinctrl-bindings.txt)
-
-Optional properties:
-  - st,syscfg          : Phandle to boot-device system configuration registers
-  - st,boot-device-reg : Address of the aforementioned boot-device register(s)
-  - st,boot-device-spi : Expected boot-device value if booted via this device
-
-Example:
-	spifsm: spifsm@...02000{
-	        compatible         = "st,spi-fsm";
-	        reg                =  <0xfe902000 0x1000>;
-	        reg-names          = "spi-fsm";
-	        pinctrl-0          = <&pinctrl_fsm>;
-		st,syscfg	   = <&syscfg_rear>;
-	        st,boot-device-reg = <0x958>;
-	        st,boot-device-spi = <0x1a>;
-	};
-

---
base-commit: cc3aa43b44bdb43dfbac0fcb51c56594a11338a8
change-id: 20251231-st-fsm-84b343517035

Best regards,
-- 
Akhila YS <akhilayalmati@...il.com>