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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
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