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

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Date:   Mon, 17 Feb 2020 16:16:00 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     rjw@...ysocki.net, 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, Linux-imx@....com
Subject: Re: [PATCH] cpufreq: imx-cpufreq-dt: Add "cpu-supply" property check

On 17-02-20, 17:42, Anson Huang wrote:
> 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;

Applied. Thanks.

-- 
viresh