linux-kernel - [PATCH] regulator: don't try to use DT information without CONFIG

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Date:   Tue,  6 Mar 2018 13:33:09 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Maciej Purski <m.purski@...sung.com>,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        Tirupathi Reddy <tirupath@...eaurora.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: don't try to use DT information without CONFIG_OF

The coupled regulator support requires CONFIG_OF today, otherwise
we get a link error:

drivers/regulator/core.o: In function `regulator_fill_coupling_array':
core.c:(.text+0x3e44): undefined reference to `of_parse_coupled_regulator'
drivers/regulator/core.o: In function `regulator_register':
core.c:(.text+0x5eb4): undefined reference to `of_get_n_coupled'
core.c:(.text+0x5f08): undefined reference to `of_check_coupling_data'

This changes the affected functions to return success when CONFIG_OF
is disabled, which should result in the same behavior as before.

Fixes: cf6fc8064766 ("regulator: core: Resolve coupled regulators")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/regulator/core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index dedf737a2bad..dbc3381105fb 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4351,6 +4351,9 @@ static int regulator_register_fill_coupling_array(struct device *dev,
 {
 	struct regulator_dev *rdev = dev_to_rdev(dev);
 
+	if (!IS_ENABLED(CONFIG_OF))
+		return 0;
+
 	if (regulator_fill_coupling_array(rdev))
 		rdev_dbg(rdev, "unable to resolve coupling\n");
 
@@ -4359,7 +4362,12 @@ static int regulator_register_fill_coupling_array(struct device *dev,
 
 static int regulator_resolve_coupling(struct regulator_dev *rdev)
 {
-	int n_phandles = of_get_n_coupled(rdev);
+	int n_phandles;
+
+	if (!IS_ENABLED(CONFIG_OF))
+		return 0;
+
+	n_phandles = of_get_n_coupled(rdev);
 
 	if (n_phandles + 1 > MAX_COUPLED) {
 		rdev_err(rdev, "too many regulators coupled\n");
-- 
2.9.0