[PATCH 06/24] dt-bindings: clock: Add ZTE ZX279128S CRM clocks and resets
Navid Ghahremani
ghahramani.navid at gmail.com
Sat Oct 10 05:59:44 PDT 2026
Describe the top CRM and the two low-speed peripheral clock domains,
including the confirmed USB reset bits. Uncertain clock-source rates are
called out in the cover letter.
Assisted-by: LLM
Signed-off-by: Navid Ghahremani <ghahramani.navid at gmail.com>
---
.../bindings/clock/zte,zx279128s-crm.yaml | 141 ++++++++++++++++++
include/dt-bindings/clock/zte,zx279128s-crm.h | 55 +++++++
2 files changed, 196 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/zte,zx279128s-crm.yaml
create mode 100644 include/dt-bindings/clock/zte,zx279128s-crm.h
diff --git a/Documentation/devicetree/bindings/clock/zte,zx279128s-crm.yaml b/Documentation/devicetree/bindings/clock/zte,zx279128s-crm.yaml
new file mode 100644
index 0000000000..2964c0fd6b
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/zte,zx279128s-crm.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/zte,zx279128s-crm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ZTE zx279128s clock and reset modules
+
+maintainers:
+ - Navid Ghahremani <ghahramani.navid at gmail.com>
+
+description: |
+ The top clock and reset module (CRM) of the ZTE zx279128s holds the PLLs and
+ the clocks of the CPUs, the buses and the bus interfaces of the peripheral
+ groups. Each of the two groups of low speed peripherals (LSP) has a clock
+ and reset/power module (CRPM) of its own, fed by the top CRM.
+
+ The top CRM also holds reset bits of several peripherals; it is a reset
+ controller too.
+
+ The clock and reset indices are in
+ include/dt-bindings/clock/zte,zx279128s-crm.h.
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - const: zte,zx279128s-topcrm
+ - const: syscon
+ - enum:
+ - zte,zx279128s-lsp0crpm
+ - zte,zx279128s-lsp1crpm
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ minItems: 1
+ maxItems: 5
+
+ clock-names:
+ minItems: 1
+ maxItems: 5
+
+ '#clock-cells':
+ const: 1
+
+ '#reset-cells':
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - '#clock-cells'
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: zte,zx279128s-topcrm
+ then:
+ properties:
+ clocks:
+ items:
+ - description: 25 MHz crystal
+ clock-names:
+ items:
+ - const: osc
+ required:
+ - '#reset-cells'
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: zte,zx279128s-lsp0crpm
+ then:
+ properties:
+ '#reset-cells': false
+ clocks:
+ items:
+ - description: register (APB) clock of the group
+ - description: 25 MHz work clock
+ - description: 32.768 kHz work clock
+ - description: 100 MHz work clock
+ clock-names:
+ items:
+ - const: pclk
+ - const: wclk25m
+ - const: wclk32k
+ - const: wclk100m
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: zte,zx279128s-lsp1crpm
+ then:
+ properties:
+ '#reset-cells': false
+ clocks:
+ items:
+ - description: register (APB) clock of the group
+ - description: AXI clock of the group
+ - description: 25 MHz work clock
+ - description: 49.152 MHz work clock
+ - description: 100 MHz work clock
+ clock-names:
+ items:
+ - const: pclk
+ - const: aclk
+ - const: wclk25m
+ - const: wclk49m
+ - const: wclk100m
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/zte,zx279128s-crm.h>
+
+ topcrm: clock-controller at 94000000 {
+ compatible = "zte,zx279128s-topcrm", "syscon";
+ reg = <0x94000000 0x1000>;
+ clocks = <&osc>;
+ clock-names = "osc";
+ #clock-cells = <1>;
+ #reset-cells = <1>;
+ };
+
+ clock-controller at 94400000 {
+ compatible = "zte,zx279128s-lsp0crpm";
+ reg = <0x94400000 0x1000>;
+ clocks = <&topcrm ZX279128S_TOP_LSP0_PCLK>,
+ <&topcrm ZX279128S_TOP_LSP0_25M>,
+ <&topcrm ZX279128S_TOP_LSP0_32K>,
+ <&topcrm ZX279128S_TOP_LSP0_100M>;
+ clock-names = "pclk", "wclk25m", "wclk32k", "wclk100m";
+ #clock-cells = <1>;
+ };
diff --git a/include/dt-bindings/clock/zte,zx279128s-crm.h b/include/dt-bindings/clock/zte,zx279128s-crm.h
new file mode 100644
index 0000000000..41fb041c8e
--- /dev/null
+++ b/include/dt-bindings/clock/zte,zx279128s-crm.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (C) 2026 Navid Ghahremani <ghahramani.navid at gmail.com>
+ */
+
+#ifndef _DT_BINDINGS_CLOCK_ZTE_ZX279128S_CRM_H
+#define _DT_BINDINGS_CLOCK_ZTE_ZX279128S_CRM_H
+
+/* Top CRM */
+#define ZX279128S_TOP_PLL_A9 0
+#define ZX279128S_TOP_PLL_LSP 1
+#define ZX279128S_TOP_CPU 2
+#define ZX279128S_TOP_A9_PERIPH 3
+#define ZX279128S_TOP_MATRIX_ACLK 4
+#define ZX279128S_TOP_MATRIX_HCLK 5
+#define ZX279128S_TOP_MATRIX_PCLK 6
+#define ZX279128S_TOP_LSP0_PCLK 7
+#define ZX279128S_TOP_LSP0_25M 8
+#define ZX279128S_TOP_LSP0_32K 9
+#define ZX279128S_TOP_LSP0_100M 10
+#define ZX279128S_TOP_LSP1_PCLK 11
+#define ZX279128S_TOP_LSP1_ACLK 12
+#define ZX279128S_TOP_LSP1_25M 13
+#define ZX279128S_TOP_LSP1_49M 14
+#define ZX279128S_TOP_LSP1_100M 15
+#define ZX279128S_TOP_IRAM_ACLK 16
+#define ZX279128S_TOP_IROM_ACLK 17
+#define ZX279128S_TOP_SYS_CTRL_PCLK 18
+#define ZX279128S_TOP_USB_ACLK 19
+#define ZX279128S_TOP_USB_SUSPEND 20
+#define ZX279128S_TOP_USB_REF 21
+
+/*
+ * Top CRM resets: (register offset / 4) * 32 + bit. The USB 3.0 controller
+ * has four in register 0x4c; what each one resets isn't known.
+ */
+#define ZX279128S_TOP_RST_USB_B9 617
+#define ZX279128S_TOP_RST_USB_B10 618
+#define ZX279128S_TOP_RST_USB_B11 619
+#define ZX279128S_TOP_RST_USB_B14 622
+
+/* Low speed peripherals 0 */
+#define ZX279128S_LSP0_UART0_WCLK 0
+#define ZX279128S_LSP0_UART0_PCLK 1
+#define ZX279128S_LSP0_UART1_WCLK 2
+#define ZX279128S_LSP0_UART1_PCLK 3
+#define ZX279128S_LSP0_SPI_WCLK 4
+#define ZX279128S_LSP0_SPI_PCLK 5
+#define ZX279128S_LSP0_GPIO_PCLK 6
+
+/* Low speed peripherals 1 */
+#define ZX279128S_LSP1_MDIO_WCLK 0
+#define ZX279128S_LSP1_MDIO_PCLK 1
+
+#endif
--
2.55.0
More information about the linux-arm-kernel
mailing list