linux-kernel - RE: [PATCH] thermal: imx: fix for dependency on cpu-freq

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Date:   Tue, 20 Nov 2018 08:47:55 +0000
From:   Anson Huang <anson.huang@....com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "edubezval@...il.com" <edubezval@...il.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] thermal: imx: fix for dependency on cpu-freq

Hi, Daniel

Best Regards!
Anson Huang

> -----Original Message-----
> From: Daniel Lezcano [mailto:daniel.lezcano@...aro.org]
> Sent: 2018年11月20日 16:45
> To: Anson Huang <anson.huang@....com>; rui.zhang@...el.com;
> edubezval@...il.com; linux-pm@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH] thermal: imx: fix for dependency on cpu-freq
> 
> On 24/10/2018 08:39, Anson Huang wrote:
> > The thermal driver is a standalone driver for monitoring SoC
> > temperature by enabling thermal sensor, so it can be enabled even when
> > CONFIG_CPU_FREQ is NOT set. So remove the dependency with
> CPU_THERMAL.
> >
> > Add CONFIG_CPU_FREQ check for cpu-freq related operation in thermal
> > driver to make thermal driver probe successfully when CONFIG_CPU_FREQ
> > is NOT set.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> 
> Why not simply kill this legacy code ?

Because killing legacy code will have old dtb compatible issue, old dtb
will NOT have cpufreq cooling function.

Anson. 

> 
> 
> 
> >  drivers/thermal/Kconfig       | 2 +-
> >  drivers/thermal/imx_thermal.c | 4 ++++
> >  2 files changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index
> > 1775d44..c8a6352 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -212,7 +212,7 @@ config HISI_THERMAL
> >
> >  config IMX_THERMAL
> >  	tristate "Temperature sensor driver for Freescale i.MX SoCs"
> > -	depends on (ARCH_MXC && CPU_THERMAL) || COMPILE_TEST
> > +	depends on ARCH_MXC || COMPILE_TEST
> >  	depends on NVMEM || !NVMEM
> >  	depends on MFD_SYSCON
> >  	depends on OF
> > diff --git a/drivers/thermal/imx_thermal.c
> > b/drivers/thermal/imx_thermal.c index 1566154..87386d1 100644
> > --- a/drivers/thermal/imx_thermal.c
> > +++ b/drivers/thermal/imx_thermal.c
> > @@ -648,6 +648,7 @@ static const struct of_device_id
> > of_imx_thermal_match[] = {  };  MODULE_DEVICE_TABLE(of,
> > of_imx_thermal_match);
> >
> > +#ifdef CONFIG_CPU_FREQ
> >  /*
> >   * Create cooling device in case no #cooling-cells property is available in
> >   * CPU node
> > @@ -668,6 +669,7 @@ static int
> > imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
> >
> >  	return 0;
> >  }
> > +#endif
> >
> >  static int imx_thermal_probe(struct platform_device *pdev)  { @@
> > -743,6 +745,7 @@ static int imx_thermal_probe(struct platform_device
> *pdev)
> >  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
> >  		     data->socdata->power_down_mask);
> >
> > +#ifdef CONFIG_CPU_FREQ
> >  	data->policy = cpufreq_cpu_get(0);
> >  	if (!data->policy) {
> >  		pr_debug("%s: CPUFreq policy not found\n", __func__); @@ -755,6
> > +758,7 @@ static int imx_thermal_probe(struct platform_device *pdev)
> >  			"failed to register cpufreq cooling device: %d\n", ret);
> >  		return ret;
> >  	}
> > +#endif
> >
> >  	data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
> >  	if (IS_ERR(data->thermal_clk)) {
> >
> 
> 
> --
> 
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