linux-kernel - [PATCH] cpufreq: imx-cpufreq-dt: Add "cpu-supply" property check

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Date:   Mon, 17 Feb 2020 17:42:55 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     rjw@...ysocki.net, viresh.kumar@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH] cpufreq: imx-cpufreq-dt: Add "cpu-supply" property check

The cpufreq-dt driver allows cpufreq driver enabled without valid
regulator assigned, however, all i.MX platforms using cpufreq-dt
driver now require valid regulator, add "cpu-supply" property check
to avoid i.MX platforms' cpufreq enabled without valid regulator
and lead to system unstable.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/cpufreq/imx-cpufreq-dt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
index 6cb8193..0e29d88 100644
--- a/drivers/cpufreq/imx-cpufreq-dt.c
+++ b/drivers/cpufreq/imx-cpufreq-dt.c
@@ -31,6 +31,9 @@ static int imx_cpufreq_dt_probe(struct platform_device *pdev)
 	int speed_grade, mkt_segment;
 	int ret;
 
+	if (!of_find_property(cpu_dev->of_node, "cpu-supply", NULL))
+		return -ENODEV;
+
 	ret = nvmem_cell_read_u32(cpu_dev, "speed_grade", &cell_value);
 	if (ret)
 		return ret;
-- 
2.7.4