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From:   Kevin Hilman <khilman@baylibre.com>
To:     Andrew Davis <afd@ti.com>, jerome Neanne <jneanne@baylibre.com>,
        Nishanth Menon <nm@ti.com>
Cc:     Lee Jones <lee@kernel.org>, lgirdwood@gmail.com,
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Subject: Re: [PATCH v6 4/6] mfd: tps65219: Add driver for TI TPS65219 PMIC
In-Reply-To: <1231f3e6-61a7-ca3c-2fbb-679b583e0df1@ti.com>
References: <20221011140549.16761-1-jneanne@baylibre.com>
 <20221011140549.16761-5-jneanne@baylibre.com>
 <Y1+q2Usm9ecicXqp@google.com>
 <1383fd22-c720-811e-a2bb-be2151675089@baylibre.com>
 <20221105000104.rtj3r6ufqwqmepon@keenly> <7heduewjp0.fsf@baylibre.com>
 <5418ac3b-04d7-5e77-7612-c8f168e24621@ti.com>
 <1267bf43-618c-7347-be3a-2792c656d9b6@baylibre.com>
 <7hk042agn4.fsf@baylibre.com>
 <1231f3e6-61a7-ca3c-2fbb-679b583e0df1@ti.com>
Date:   Thu, 10 Nov 2022 12:16:27 -0800
Message-ID: <7hfseqa7l0.fsf@baylibre.com>
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Andrew Davis <afd@ti.com> writes:

> On 11/10/22 11:00 AM, Kevin Hilman wrote:
>> jerome Neanne <jneanne@baylibre.com> writes:
>>=20
>>> On 09/11/2022 22:59, Andrew Davis wrote:
>>>> On 11/7/22 3:14 PM, Kevin Hilman wrote:
>>>>> Nishanth Menon <nm@ti.com> writes:
>>>>>
>>>>>> On 13:58-20221104, jerome Neanne wrote:
>>>>>>>
>>>>>> [...]
>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>> Can you try an compile with W=3D1 please.
>>>>>>> This raise one warning on mfd:
>>>>>>> drivers/mfd/tps65219.c:28:12: warning: =E2=80=98tps65219_soft_shutd=
own=E2=80=99
>>>>>>> defined but
>>>>>>> not used [-Wunused-function]
>>>>>>>  =C2=A0=C2=A0=C2=A0 28 | static int tps65219_soft_shutdown(struct t=
ps65219 *tps)
>>>>>>>  =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^~~~~~~~~~~~~~~~~~~~~~
>>>>>>> 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.c=
om/
>>>>>>>
>>>>>>> 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) {
>>>>>>  =C2=A0=C2=A0=C2=A0=C2=A0tps65219_i2c_client =3D client;
>>>>>>  =C2=A0=C2=A0=C2=A0=C2=A0pm_power_off =3D &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 jo=
b 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.
>>>>>
>>>>
>>>> Then should be using the sys-off handler API[0] so it doesn't block PS=
CI
>>>> which is also switching over[1].
>>>>
>>>> Andrew
>>>>
>>>> [0] https://lwn.net/Articles/894511/
>>>> [1] https://www.spinics.net/lists/arm-kernel/msg1024127.html
>>> Can we go for upstream with v7 without tps65219_soft_shutdown. Then if
>>> everyone agrees with Andrew proposal, I'll submit a separate patch which
>>> adds implementation of tps65219_soft_shutdown support through sys-off
>>> handler.
>>>
>>> So that we are not blocking upstream in case further
>>> discussions/alignment are required.
>>=20
>> Seems OK to me.  Nishanth?  Andrew?
>>=20
>> But I think you'll need to at least submit a v8 without the unused
>> code/dead code that Lee pointed out.
>>=20
>
> If you need the v8 anyway, then add support through sys-off in
> that spin, should only be a couple lines of change.

Oops, my mistake.  I see v7 already has the dead code removed.  I got
confused because this thread is on v6.

IMO, I think v7 should be merged v7 (mfd part is already ack'd by Lee)
and then Jerome will follow up with the support for sys-off as an
additional series.

Kevin