linux-kernel - Re: [PATCH v6 4/6] mfd: tps65219: Add driver for TI TPS65219 PMIC

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Message-ID: <7heduewjp0.fsf@baylibre.com>
Date:   Mon, 07 Nov 2022 13:14:51 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Nishanth Menon <nm@...com>, jerome Neanne <jneanne@...libre.com>
Cc:     Lee Jones <lee@...nel.org>, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, kristo@...nel.org,
        dmitry.torokhov@...il.com, krzysztof.kozlowski+dt@...aro.org,
        catalin.marinas@....com, will@...nel.org, tony@...mide.com,
        vigneshr@...com, bjorn.andersson@...aro.org, shawnguo@...nel.org,
        geert+renesas@...der.be, dmitry.baryshkov@...aro.org,
        marcel.ziswiler@...adex.com, vkoul@...nel.org,
        biju.das.jz@...renesas.com, arnd@...db.de, jeff@...undy.com,
        afd@...com, narmstrong@...libre.com, msp@...libre.com,
        j-keerthy@...com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-input@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH v6 4/6] mfd: tps65219: Add driver for TI TPS65219 PMIC

Nishanth Menon <nm@...com> writes:

> On 13:58-20221104, jerome Neanne wrote:
>> 
> [...]
>
>> 
>> > 
>> > Can you try an compile with W=1 please.
>> This raise one warning on mfd:
>> drivers/mfd/tps65219.c:28:12: warning: ‘tps65219_soft_shutdown’ defined but
>> not used [-Wunused-function]
>>    28 | static int tps65219_soft_shutdown(struct tps65219 *tps)
>>       |            ^~~~~~~~~~~~~~~~~~~~~~
>> soft_shutdown has been validated and is used in TI baseline even if not
>> hooked in upstream version further to this review:
>> https://lore.kernel.org/lkml/20220825150224.826258-5-msp@baylibre.com/
>> 
>> It was a TI requirement to implement it...
>> Let me know if you want me to remove this function or if we can keep it like
>> this.
>
> There are platforms without psci, correct? I think the comment was to
> drop the force override with system-power-controller property,
>
> if (!pm_power_off) {
> 	tps65219_i2c_client = client;
> 	pm_power_off = &tps65219_pm_power_off;
> }
>
> Could still be valid for such platforms, no? I do see that the
> capability that the PMIC has - which is software shutdown is a valid
> feature that we support in many different PMIC drivers. Is'nt the job of
> the driver to introduce the functionality in a manner that is
> appropriate to the OS framework?

Yeah, I think Nishanth is right here.

We should probably keep the `if (!pm_power_off)` part so the PMIC will
be used if PSCI is not, but it also allows an easy way to test/use the PMIC
shutdown functionality downstream if needed.

Kevin