linux-kernel - [PATCH RESEND 1/2] regulator: Add support for parsing operation mode

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Date:	Wed, 11 May 2016 17:31:29 +0800
From:	Henry Chen <henryc.chen@...iatek.com>
To:	Rob Herring <robh+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>
CC:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Henry Chen <henryc.chen@...iatek.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: [PATCH RESEND 1/2] regulator: Add support for parsing operation mode

Some regulators support their operating mode to be changed by
consumers for module specific purpose.

This patch adds support to parse those properties and fill the
regulator constraints so the regulator core can call the
regualtor_set_mode to change the modes.

Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
---
 Documentation/devicetree/bindings/regulator/regulator.txt | 10 ++++++++++
 drivers/regulator/of_regulator.c                          | 14 ++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index ecfc593..88f98f0 100644
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -49,6 +49,16 @@ Optional properties:
 	0: Disable active discharge.
 	1: Enable active discharge.
 	Absence of this property will leave configuration to default.
+- regulator-allow-change-mode: allow the regulator mode to be configured
+- regulator-supported-modes: Regulators can run in a variety of different operating
+  modes depending on output load. This allows further system power savings by
+  selecting the best (and most efficient) regulator mode for a desired load.
+  The definition for each of these operation is defined at
+  include/linux/regulator/consumer.h
+	0: FAST.
+	1: NORMAL.
+	2: IDLE.
+	3: STANDBY.
 
 Deprecated properties:
 - regulator-compatible: If a regulator chip contains multiple
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 6b0aa80..12fe8c8 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -167,6 +167,20 @@ static void of_get_regulation_constraints(struct device_node *np,
 		suspend_state = NULL;
 		suspend_np = NULL;
 	}
+
+	if (of_property_read_bool(np, "regulator-allow-change-mode"))
+		constraints->valid_ops_mask |= REGULATOR_CHANGE_MODE;
+
+	ret = of_property_count_elems_of_size(np,
+					      "regulator-supported-modes",
+					      sizeof(u32));
+	for (i = 0; i < ret; i++) {
+		u32 mode;
+
+		of_property_read_u32_index(np, "regulator-supported-modes",
+					   i, &mode);
+		constraints->valid_modes_mask |= (1 << mode);
+	}
 }
 
 /**
-- 
1.8.1.1.dirty