linux-kernel - [PATCH v3 3/4] dt-bindings: pinctrl-zynqmp: Add output-enable configuration

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Date:   Mon, 31 Jul 2023 15:20:25 +0530
From:   Sai Krishna Potthuri <sai.krishna.potthuri@....com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Michal Simek <michal.simek@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Tanmay Shah <tanmay.shah@....com>,
        Ben Levinsky <ben.levinsky@....com>,
        Marek Vasut <marex@...x.de>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Arnd Bergmann <arnd@...db.de>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <saikrishna12468@...il.com>,
        <git@....com>, Sai Krishna Potthuri <sai.krishna.potthuri@....com>
Subject: [PATCH v3 3/4] dt-bindings: pinctrl-zynqmp: Add output-enable configuration

Add 'output-enable' configuration parameter to the properties list.

Using these pinctrl properties observed hang issues with older Xilinx
ZynqMP Platform Management Firmware, hence reverted the patch previously.
Commit ff8356060e3a5e126abb ("Revert "dt-bindings: pinctrl-zynqmp: Add
output-enable configuration"").

Support for configuring these properties added in Xilinx ZynqMP Platform
Management firmware(PMUFW) Configuration Set version 2.0. Linux firmware
driver checks if the configuration is supported by the PMUFW when it gets
request for TRISTATE configuration from pinctrl driver. If it supports,
then calls will be made otherwise it returns error.

Signed-off-by: Sai Krishna Potthuri <sai.krishna.potthuri@....com>
Acked-by: Conor Dooley <conor.dooley@...rochip.com>
---
 .../devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml      | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml
index 2722dc7bb03d..1e2b9b627b12 100644
--- a/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml
@@ -274,6 +274,10 @@ patternProperties:
           slew-rate:
             enum: [0, 1]
 
+          output-enable:
+            description:
+              This will internally disable the tri-state for MIO pins.
+
           drive-strength:
             description:
               Selects the drive strength for MIO pins, in mA.
-- 
2.25.1