linux-kernel - [PATCH 4.9 090/102] Documentation: pinctrl: palmas: Add ti,palmas-powerhold-override property definition

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Date:   Fri,  6 Apr 2018 15:24:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Keerthy <j-keerthy@...com>,
        Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 4.9 090/102] Documentation: pinctrl: palmas: Add ti,palmas-powerhold-override property definition

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Keerthy <j-keerthy@...com>

commit 0ea66f76ba17a4b229caaadd77de694111b21769 upstream.

GPIO7 is configured in POWERHOLD mode which has higher priority
over DEV_ON bit and keeps the PMIC supplies on even after the DEV_ON
bit is turned off. This property enables driver to over ride the
POWERHOLD value to GPIO7 so as to turn off the PMIC in power off
scenarios.

Signed-off-by: Keerthy <j-keerthy@...com>
Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Cc: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 Documentation/devicetree/bindings/pinctrl/pinctrl-palmas.txt |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-palmas.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-palmas.txt
@@ -35,6 +35,15 @@ Optional properties:
 - ti,palmas-enable-dvfs2: Enable DVFS2. Configure pins for DVFS2 mode.
 	Selection primary or secondary function associated to GPADC_START
 	and SYSEN2 pin/pad for DVFS2 interface
+- ti,palmas-override-powerhold: This is applicable for PMICs for which
+	GPIO7 is configured in POWERHOLD mode which has higher priority
+	over DEV_ON bit and keeps the PMIC supplies on even after the DEV_ON
+	bit is turned off. This property enables driver to over ride the
+	POWERHOLD value to GPIO7 so as to turn off the PMIC in power off
+	scenarios. So for GPIO7 if ti,palmas-override-powerhold is set
+	then the GPIO_7 field should never be muxed to anything else.
+	It should be set to POWERHOLD by default and only in case of
+	power off scenarios the driver will over ride the mux value.
 
 This binding uses the following generic properties as defined in
 pinctrl-bindings.txt: