linux-kernel - [PATCH] regulator: scmi: Allow for zero voltage domains

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Message-Id: <20230126180511.766373-1-cristian.marussi@arm.com>
Date:   Thu, 26 Jan 2023 18:05:11 +0000
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     sudeep.holla@....com, Cristian Marussi <cristian.marussi@....com>,
        Mark Brown <broonie@...nel.org>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>
Subject: [PATCH] regulator: scmi: Allow for zero voltage domains

SCMI Voltage protocol allows the platform to report no voltage domains
on discovery, while warning the user about such an odd configuration.
As a consequence this condition should not be treated as error by the SCMI
regulator driver either.

Allow SCMI regulator driver to probe successfully even when no voltage
domains are discovered.

Cc: Mark Brown <broonie@...nel.org>
Cc: Jim Quinlan <james.quinlan@...adcom.com>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>
Fixes: 0fbeae70ee7c ("regulator: add SCMI driver")
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/regulator/scmi-regulator.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/regulator/scmi-regulator.c b/drivers/regulator/scmi-regulator.c
index b9918f4fd241..29ab217297d6 100644
--- a/drivers/regulator/scmi-regulator.c
+++ b/drivers/regulator/scmi-regulator.c
@@ -311,16 +311,12 @@ static int scmi_regulator_probe(struct scmi_device *sdev)
 		return PTR_ERR(voltage_ops);
 
 	num_doms = voltage_ops->num_domains_get(ph);
-	if (num_doms <= 0) {
-		if (!num_doms) {
-			dev_err(&sdev->dev,
-				"number of voltage domains invalid\n");
-			num_doms = -EINVAL;
-		} else {
-			dev_err(&sdev->dev,
-				"failed to get voltage domains - err:%d\n",
-				num_doms);
-		}
+	if (!num_doms)
+		return 0;
+
+	if (num_doms < 0) {
+		dev_err(&sdev->dev, "failed to get voltage domains - err:%d\n",
+			num_doms);
 
 		return num_doms;
 	}
-- 
2.34.1