linux-kernel - [PATCH 2/3] regulator: mcp16502: lpm pin can be optional on some platforms

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Date:   Thu, 7 Jan 2021 16:15:26 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <robh+dt@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <nicolas.ferre@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 2/3] regulator: mcp16502: lpm pin can be optional on some platforms

On some platform (e.g. SAMA7G5) LPM pin should be optional as it can
be controlled explicitly (via shutdown controller registers) in the
platform specific power saving code to decrease the power consumption
while suspended as this SoC pin may be connected to other devices that
could take power saving actions based on its value.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/regulator/mcp16502.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/mcp16502.c b/drivers/regulator/mcp16502.c
index 74ad92dc664a..88c6bd5b6c78 100644
--- a/drivers/regulator/mcp16502.c
+++ b/drivers/regulator/mcp16502.c
@@ -550,7 +550,7 @@ static int mcp16502_probe(struct i2c_client *client,
 	config.regmap = rmap;
 	config.driver_data = mcp;
 
-	mcp->lpm = devm_gpiod_get(dev, "lpm", GPIOD_OUT_LOW);
+	mcp->lpm = devm_gpiod_get_optional(dev, "lpm", GPIOD_OUT_LOW);
 	if (IS_ERR(mcp->lpm)) {
 		dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));
 		return PTR_ERR(mcp->lpm);
-- 
2.7.4