linux-kernel - [PATCH v3 1/3] dt-bindings: hwlock: Adding brcmstb-hwspinlock support

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Message-Id: <20251009212003.2714447-2-kamal.dasu@broadcom.com>
Date: Thu,  9 Oct 2025 17:20:01 -0400
From: Kamal Dasu <kamal.dasu@...adcom.com>
To: peng.fan@....nxp.com,
	andersson@...nel.org,
	baolin.wang@...ux.alibaba.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	florian.fainelli@...adcom.com
Cc: bcm-kernel-feedback-list@...adcom.com,
	linux-remoteproc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Kamal Dasu <kamal.dasu@...adcom.com>
Subject: [PATCH v3 1/3] dt-bindings: hwlock: Adding brcmstb-hwspinlock support

The broadcom settop SoCs have hardware semaphores as part of "sundry"
IP block which has other controls that do not belong anywhere else.
e.g. pin/mux controls, SoC identification, drive strength, reset controls,
and other misc bits are part of this block.

Adding brcmstb-hwspinlock bindings which allows the hwspinlock driver to
iomap only the 16 hardware semaphore registers that are part of all settop
SoCs. Hence the bindings shall use the common "brcm,brcmstb-hwspinlock"
compatibility string.

Signed-off-by: Kamal Dasu <kamal.dasu@...adcom.com>
---
 .../hwlock/brcm,brcmstb-hwspinlock.yaml       | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwlock/brcm,brcmstb-hwspinlock.yaml

diff --git a/Documentation/devicetree/bindings/hwlock/brcm,brcmstb-hwspinlock.yaml b/Documentation/devicetree/bindings/hwlock/brcm,brcmstb-hwspinlock.yaml
new file mode 100644
index 000000000000..f45399b4fe0b
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/brcm,brcmstb-hwspinlock.yaml
@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwlock/brcm,brcmstb-hwspinlock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom settop Hardware Spinlock
+
+maintainers:
+  - Kamal Dasu <kamal.dasu@...adcom.com>
+
+properties:
+  compatible:
+    const: brcm,brcmstb-hwspinlock
+
+  "#hwlock-cells":
+    const: 1
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - "#hwlock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    hwlock@...4038 {
+        compatible = "brcm,brcmstb-hwspinlock";
+        reg = <0x8404038 0x40>;
+        #hwlock-cells = <1>;
+    };
+
-- 
2.34.1