linux-kernel - Applied "regulator: max8973: add support to configure ETR from DT" to the regulator tree

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Date:	Tue, 07 Jul 2015 14:58:28 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Laxman Dewangan <ldewangan@...dia.com>,
	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regulator: max8973: add support to configure ETR from DT" to the regulator tree

The patch

   regulator: max8973: add support to configure ETR from DT

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 3692db3a904800445f8af249e1ac0f2b6496f31d Mon Sep 17 00:00:00 2001
From: Laxman Dewangan <ldewangan@...dia.com>
Date: Wed, 1 Jul 2015 18:31:43 +0530
Subject: [PATCH] regulator: max8973: add support to configure ETR from DT

The MAX8973/MAX77621 feature an Enhanced Transient Response(ETR)
circuit that is enabled through software. The enhanced transient
response reduces the voltage droop during large load steps by
temporarily allowing all three phases to fire in unison, slewing
total inductor current faster than would normally be possible if
all three phases continued to operate 120deg out of phase. The
enhanced transient response detector features two selectable
sensitivity settings, which select the output voltage slew rate
during load transients that triggers the ETR circuit. The sensitivity
of the ETR detector is set by the CKADV[1:0] bits in the CONTROL2
register.

Add support to configure the ETR through platform data from DT.
Update the DT binding document accordingly.

Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 .../bindings/regulator/max8973-regulator.txt          |  6 ++++++
 drivers/regulator/max8973-regulator.c                 | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/max8973-regulator.txt b/Documentation/devicetree/bindings/regulator/max8973-regulator.txt
index 55efb24..f80ea2f 100644
--- a/Documentation/devicetree/bindings/regulator/max8973-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/max8973-regulator.txt
@@ -25,6 +25,12 @@ Optional properties:
 -maxim,enable-frequency-shift: boolean, enable 9% frequency shift.
 -maxim,enable-bias-control: boolean, enable bias control. By enabling this
 		startup delay can be reduce to 20us from 220us.
+-maxim,enable-etr: boolean, enable Enhanced Transient Response.
+-maxim,enable-high-etr-sensitivity: boolean, Enhanced transient response
+		circuit is enabled and set for high sensitivity. If this
+		property is available then etr will be enable default.
+
+Enhanced transient response (ETR) will affect the configuration of CKADV.

 Example:

diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index e94ddcf..a8fd7f4 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -421,6 +421,8 @@ static struct max8973_regulator_platform_data *max8973_parse_dt(
 	struct device_node *np = dev->of_node;
 	int ret;
 	u32 pval;
+	bool etr_enable;
+	bool etr_sensitivity_high;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -452,6 +454,23 @@ static struct max8973_regulator_platform_data *max8973_parse_dt(
 	if (of_property_read_bool(np, "maxim,enable-bias-control"))
 		pdata->control_flags  |= MAX8973_CONTROL_BIAS_ENABLE;

+	etr_enable = of_property_read_bool(np, "maxim,enable-etr");
+	etr_sensitivity_high = of_property_read_bool(np,
+				"maxim,enable-high-etr-sensitivity");
+	if (etr_sensitivity_high)
+		etr_enable = true;
+
+	if (etr_enable) {
+		if (etr_sensitivity_high)
+			pdata->control_flags |=
+				MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US;
+		else
+			pdata->control_flags |=
+				MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US;
+	} else {
+		pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED;
+	}
+
 	return pdata;
 }

-- 
2.1.4

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