linux-kernel - [PATCH 03/16] dt-bindings: spi: Add spi peripheral specific property

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Message-Id: <20230106200809.330769-4-william.zhang@broadcom.com>
Date:   Fri,  6 Jan 2023 12:07:55 -0800
From:   William Zhang <william.zhang@...adcom.com>
To:     Linux SPI List <linux-spi@...r.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>
Cc:     anand.gore@...adcom.com, tomer.yacoby@...adcom.com,
        dan.beygelman@...adcom.com, joel.peshkin@...adcom.com,
        f.fainelli@...il.com, jonas.gorski@...il.com,
        kursad.oney@...adcom.com, dregan@...l.com,
        William Zhang <william.zhang@...adcom.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 03/16] dt-bindings: spi: Add spi peripheral specific property

brcm,no-clk-gate is a Broadcom Broadband HS SPI controller specific
property for certain SPI device such as Broadcom ISI voice daughtercard
to work properly. It disables the clock gating feature when the chip
select is deasserted for any device that wants to keep the clock
running.

Signed-off-by: William Zhang <william.zhang@...adcom.com>
---

 .../brcm,bcm63xx-hsspi-peripheral-props.yaml  | 27 +++++++++++++++++++
 .../bindings/spi/spi-peripheral-props.yaml    |  1 +
 2 files changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi-peripheral-props.yaml

diff --git a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi-peripheral-props.yaml
new file mode 100644
index 000000000000..81884e2cc42d
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi-peripheral-props.yaml
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/brcm,bcm63xx-hsspi-peripheral-props.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Peripheral-specific properties for Broadcom Broadband SoC HSSPI controller
+
+description:
+  See spi-peripheral-props.yaml for more info.
+
+maintainers:
+  - William Zhang <william.zhang@...adcom.com>
+  - Kursad Oney <kursad.oney@...adcom.com>
+  - Jonas Gorski <jonas.gorski@...il.com>
+
+properties:
+  brcm,no-clk-gate:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Some SPI device such as Broadcom ISI based voice daughtercard requires SPI
+      clock running even when chip select is deasserted. By default the
+      controller turns off or gate the clock when cs is not active to save
+      power. This flag tells the controller driver to keep the clock running
+      when chip select is not active.
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
index ead2cccf658f..f85d777c7b67 100644
--- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
@@ -108,5 +108,6 @@ allOf:
   - $ref: cdns,qspi-nor-peripheral-props.yaml#
   - $ref: samsung,spi-peripheral-props.yaml#
   - $ref: nvidia,tegra210-quad-peripheral-props.yaml#
+  - $ref: brcm,bcm63xx-hsspi-peripheral-props.yaml#
 
 additionalProperties: true
-- 
2.37.3