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9538c7fac0
Backport gated-fixed-clk driver from Linux v6.13. This is needed to fix a PCIe controller probe hang on the Radxa ROCK 5 ITX. Signed-off-by: FUKAUMI Naoki <naoki@radxa.com> Link: https://github.com/openwrt/openwrt/pull/19867 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
83 lines
2.2 KiB
Diff
83 lines
2.2 KiB
Diff
From a4a7cbe36623ffaabbae413c0eacf40d033db71f Mon Sep 17 00:00:00 2001
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From: Heiko Stuebner <heiko@sntech.de>
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Date: Fri, 6 Sep 2024 10:25:07 +0200
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Subject: dt-bindings: clocks: add binding for gated-fixed-clocks
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In contrast to fixed clocks that are described as ungateable, boards
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sometimes use additional oscillators for things like PCIe reference
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clocks, that need actual supplies to get enabled and enable-gpios to be
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toggled for them to work.
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This adds a binding for such oscillators that are not configurable
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themself, but need to handle supplies for them to work.
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In schematics they often can be seen as
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----------------
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Enable - | 100MHz,3.3V, | - VDD
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| 3225 |
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GND - | | - OUT
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----------------
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or similar. The enable pin might be separate but can also just be tied
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to the vdd supply, hence it is optional in the binding.
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Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
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Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
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Link: https://lore.kernel.org/r/20240906082511.2963890-2-heiko@sntech.de
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Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/clock/gated-fixed-clock.yaml
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@@ -0,0 +1,49 @@
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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+%YAML 1.2
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+---
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+$id: http://devicetree.org/schemas/clock/gated-fixed-clock.yaml#
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+$schema: http://devicetree.org/meta-schemas/core.yaml#
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+
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+title: Gated Fixed clock
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+
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+maintainers:
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+ - Heiko Stuebner <heiko@sntech.de>
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+
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+properties:
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+ compatible:
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+ const: gated-fixed-clock
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+
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+ "#clock-cells":
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+ const: 0
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+
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+ clock-frequency: true
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+
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+ clock-output-names:
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+ maxItems: 1
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+
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+ enable-gpios:
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+ description:
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+ Contains a single GPIO specifier for the GPIO that enables and disables
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+ the oscillator.
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+ maxItems: 1
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+
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+ vdd-supply:
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+ description: handle of the regulator that provides the supply voltage
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+
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+required:
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+ - compatible
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+ - "#clock-cells"
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+ - clock-frequency
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+ - vdd-supply
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+
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+additionalProperties: false
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+
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+examples:
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+ - |
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+ clock-1000000000 {
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+ compatible = "gated-fixed-clock";
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+ #clock-cells = <0>;
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+ clock-frequency = <1000000000>;
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+ vdd-supply = <®_vdd>;
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+ };
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+...
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