linux-kernel - [PATCH 04/11] dt-bindings: wkup_m3_ipc: Add ti,io-isolation property

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Message-Id: <20220219215328.485660-5-dfustini@baylibre.com>
Date:   Sat, 19 Feb 2022 13:53:21 -0800
From:   Drew Fustini <dfustini@...libre.com>
To:     Benoît Cousson <bcousson@...libre.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dave Gerlach <d-gerlach@...com>, devicetree@...r.kernel.org,
        Drew Fustini <dfustini@...libre.com>,
        Keerthy <j-keerthy@...com>, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-remoteproc@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Tony Lindgren <tony@...mide.com>, s-anna@...com,
        khilman@...libre.com
Subject: [PATCH 04/11] dt-bindings: wkup_m3_ipc: Add ti,io-isolation property

From: Dave Gerlach <d-gerlach@...com>

Add documentation for the ti,io-isolation DT property on the wkup_m3_ipc
node which tells the wkup_m3_ipc driver to use the wkup_m3 to enable
IO Isolation during low power mode transitions on am43xx platforms.

Signed-off-by: Dave Gerlach <d-gerlach@...com>
Signed-off-by: Drew Fustini <dfustini@...libre.com>
---
 .../bindings/soc/ti/wkup_m3_ipc.txt           | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt
index 4cdbb60fd0d0..df6b600abf4c 100644
--- a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt
+++ b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt
@@ -89,3 +89,49 @@ Example:
 		ti,vtt-gpio-pin = <7>;
 		...
 	};
+
+
+IO Isolation
+============
+Supported by: AM43xx SoCs
+
+It is possible to configure any pin with a corresponding CTRL_CONF_*
+register in the control module to use the states defined in the DS_PAD_CONFIG
+bits by enabling IO isolation on the SoC. The 'ti,set-io-isolation' property
+tells the wkup_m3_ipc driver to enable IO isolation late in the suspend path
+after all drivers have been disabled.
+
+Optional properties:
+- ti,set-io-isolation:	Indicates that the IO's should be placed into
+			isolation and the DS_PAD_CONFIG values should be
+			used during suspend.
+
+Example (VTT Toggle using any GPIO on am437x-gp-evm):
+-----------------------------------------------------
+
+On the AM437x GP EVM, the VTT enable line must be held low to disable VTT
+regulator and held high to enable, so the following pinctrl entry is used.
+The DS pull is enabled which uses a pull down by default and DS off mode is
+used which outputs a low by default. For the normal state, a pull up is
+specified so that the VTT enable line gets pulled high immediately after
+the DS states are removed upon exit from DeepSleep0.
+
+	&am43xx_pinmux {
+		pinctrl-names = "default";
+		pinctrl-0 = <&ddr3_vtt_toggle_default>;
+
+		ddr3_vtt_toggle_default: ddr_vtt_toggle_default {
+		pinctrl-single,pins = <
+			0x25C (DS0_PULL_UP_DOWN_EN | PIN_OUTPUT_PULLUP |
+			       DS0_FORCE_OFF_MODE | MUX_MODE7)>;
+		};
+		...
+	};
+
+	wkup_m3_ipc: wkup_m3_ipc@...4 {
+		compatible = "ti,am4372-wkup-m3-ipc";
+		...
+		...
+		ti,set-io-isolation;
+		...
+	};
-- 
2.32.0