linux-kernel - [PATCH] regulator: arizona-ldo1: Only enable status change if we have LDOENA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 22 Apr 2016 14:43:28 +0100
From:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:	<broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <patches@...nsource.wolfsonmicro.com>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] regulator: arizona-ldo1: Only enable status change if we have LDOENA

The driver was hardcoding REGULATOR_CHANGE_STATUS on the regulator
which made the regulator core assume that it can be powered off.

The power state of the regulator is controlled by the LDOENA pin so
this patch changes to only setting the REGULATOR_CHANGE_STATUS flag
if we have a valid gpio for LDOENA.

Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
---
 drivers/regulator/arizona-ldo1.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/regulator/arizona-ldo1.c b/drivers/regulator/arizona-ldo1.c
index f7c88ff..edeb36b 100644
--- a/drivers/regulator/arizona-ldo1.c
+++ b/drivers/regulator/arizona-ldo1.c
@@ -161,16 +161,12 @@ static const struct regulator_init_data arizona_ldo1_dvfs = {
 	.constraints = {
 		.min_uV = 1200000,
 		.max_uV = 1800000,
-		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
-				  REGULATOR_CHANGE_VOLTAGE,
+		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
 	},
 	.num_consumer_supplies = 1,
 };
 
 static const struct regulator_init_data arizona_ldo1_default = {
-	.constraints = {
-		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
-	},
 	.num_consumer_supplies = 1,
 };
 
@@ -178,8 +174,7 @@ static const struct regulator_init_data arizona_ldo1_wm5110 = {
 	.constraints = {
 		.min_uV = 1175000,
 		.max_uV = 1200000,
-		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
-				  REGULATOR_CHANGE_VOLTAGE,
+		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
 	},
 	.num_consumer_supplies = 1,
 };
@@ -290,9 +285,9 @@ static int arizona_ldo1_probe(struct platform_device *pdev)
 	config.ena_gpio = arizona->pdata.ldoena;
 
 	if (arizona->pdata.ldo1)
-		config.init_data = arizona->pdata.ldo1;
-	else
-		config.init_data = &ldo1->init_data;
+		ldo1->init_data = *arizona->pdata.ldo1;
+
+	config.init_data = &ldo1->init_data;
 
 	/*
 	 * LDO1 can only be used to supply DCVDD so if it has no
@@ -301,6 +296,15 @@ static int arizona_ldo1_probe(struct platform_device *pdev)
 	if (config.init_data->num_consumer_supplies == 0)
 		arizona->external_dcvdd = true;
 
+	if (!arizona->external_dcvdd &&
+	    (config.ena_gpio || config.ena_gpio_initialized) &&
+	    gpio_is_valid(config.ena_gpio))
+		ldo1->init_data.constraints.valid_ops_mask |=
+			REGULATOR_CHANGE_STATUS;
+	else
+		dev_warn(arizona->dev,
+			 "No LDOENA: regulator will be always-on\n");
+
 	ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 
 	of_node_put(config.of_node);
-- 
1.9.1