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Message-ID: <20221121122957.21611-3-johnson.wang@mediatek.com>
Date: Mon, 21 Nov 2022 20:29:55 +0800
From: Johnson Wang <johnson.wang@...iatek.com>
To: <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
<angelogioacchino.delregno@...labora.com>, <sboyd@...nel.org>
CC: <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
Johnson Wang <johnson.wang@...iatek.com>,
Edward-JW Yang <edward-jw.yang@...iatek.com>
Subject: [PATCH v5 2/4] dt-bindings: clock: mediatek: Add new bindings of MediaTek frequency hopping
Add the new binding documentation for MediaTek frequency hopping
and spread spectrum clocking control.
Co-developed-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
Signed-off-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
Signed-off-by: Johnson Wang <johnson.wang@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
.../bindings/clock/mediatek,mt8186-fhctl.yaml | 53 +++++++++++++++++++
1 file changed, 53 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt8186-fhctl.yaml
diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt8186-fhctl.yaml b/Documentation/devicetree/bindings/clock/mediatek,mt8186-fhctl.yaml
new file mode 100644
index 000000000000..cfd042ac1e14
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/mediatek,mt8186-fhctl.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/mediatek,mt8186-fhctl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek frequency hopping and spread spectrum clocking control
+
+maintainers:
+ - Edward-JW Yang <edward-jw.yang@...iatek.com>
+
+description: |
+ Frequency hopping control (FHCTL) is a piece of hardware that control
+ some PLLs to adopt "hopping" mechanism to adjust their frequency.
+ Spread spectrum clocking (SSC) is another function provided by this hardware.
+
+properties:
+ compatible:
+ const: mediatek,mt8186-fhctl
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ description: Phandles of the PLL with FHCTL hardware capability.
+ minItems: 1
+ maxItems: 30
+
+ mediatek,hopping-ssc-percent:
+ description: The percentage of spread spectrum clocking for one PLL.
+ minItems: 1
+ maxItems: 30
+ items:
+ default: 0
+ minimum: 0
+ maximum: 8
+
+required:
+ - compatible
+ - reg
+ - clocks
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/mt8186-clk.h>
+ fhctl: fhctl@...0ce00 {
+ compatible = "mediatek,mt8186-fhctl";
+ reg = <0x1000ce00 0x200>;
+ clocks = <&apmixedsys CLK_APMIXED_MSDCPLL>;
+ mediatek,hopping-ssc-percent = <3>;
+ };
--
2.18.0
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