linux-kernel - Re: [PATCH v12] thermal: drivers: mediatek: Add the Low Voltage Thermal Sensor driver

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Message-ID: <20230206140713.GB15176@linaro.org>
Date:   Mon, 6 Feb 2023 15:07:13 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     bchihi@...libre.com, angelogioacchino.delregno@...labora.com,
        rafael@...nel.org, amitk@...nel.org, rui.zhang@...el.com,
        matthias.bgg@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, rdunlap@...radead.org,
        ye.xingchen@....com.cn, p.zabel@...gutronix.de,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        khilman@...libre.com, james.lo@...iatek.com,
        rex-bc.chen@...iatek.com
Subject: Re: [PATCH v12] thermal: drivers: mediatek: Add the Low Voltage
 Thermal Sensor driver

On Wed, Feb 01, 2023 at 08:55:07AM +0100, Krzysztof Kozlowski wrote:
> On 31/01/2023 16:38, bchihi@...libre.com wrote:
> > From: Balsam CHIHI <bchihi@...libre.com>
> > 
> > The Low Voltage Thermal Sensor (LVTS) is a multiple sensors, multi
> > controllers contained in a thermal domain.
> > 
> > A thermal domains can be the MCU or the AP.
> > 
> > Each thermal domains contain up to seven controllers, each thermal
> > controller handle up to four thermal sensors.
> > 
> > The LVTS has two Finite State Machines (FSM), one to handle the
> > functionin temperatures range like hot or cold temperature and another
> > one to handle monitoring trip point. The FSM notifies via interrupts
> > when a trip point is crossed.
> > 
> 
> (...)
> 
> > +
> > +struct lvts_domain {
> > +	struct lvts_ctrl *lvts_ctrl;
> > +	struct reset_control *reset;
> > +	struct clk *clk;
> > +	int num_lvts_ctrl;
> > +	void __iomem *base;
> > +	size_t calib_len;
> > +	u8 *calib;
> > +};
> > +
> > +#ifdef CONFIG_MTK_LVTS_THERMAL_DEBUGFS
> > +
> > +static struct dentry *root;
> 
> How do you handle two instances of driver?

For now, we can put the entry in /sys/kernel/debug/<dev_name>

I'm preparing a debugfs series for the thermal framework and that will provide
an entry to hook in for the sensors debugfs if available