linux-kernel - Re: [PATCH] dt-bindings: power: supply: sc27xx-fg: add low voltage alarm IRQ

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Message-ID: <Zr74o7/4uurJeRnF@standask-GA-A55M-S2HP>
Date: Fri, 16 Aug 2024 08:58:43 +0200
From: Stanislav Jakubek <stano.jakubek@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Orson Zhai <orsonzhai@...il.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Chunyan Zhang <zhang.lyra@...il.com>, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: power: supply: sc27xx-fg: add low voltage
 alarm IRQ

Hi Conor,

On Thu, Aug 15, 2024 at 03:46:18PM +0100, Conor Dooley wrote:
> On Thu, Aug 15, 2024 at 12:01:36PM +0200, Stanislav Jakubek wrote:
> > The SC27XX fuel gauge supports a low voltage alarm IRQ, which is used
> > for more accurate battery capacity measurements with lower voltages.
> > 
> > This was unfortunately never documented in bindings, do so now.
> > 
> > Signed-off-by: Stanislav Jakubek <stano.jakubek@...il.com>
> > ---
> > Initial Linux driver submission adding this feature:
> > https://lore.kernel.org/lkml/ee1dd39f126bd03fb88381de9663d32df994d341.1542185618.git.baolin.wang@linaro.org/
> > 
> > The only in-tree user (sc2731.dtsi) has had interrupts specified since its
> > initial fuel-gauge submission:
> > https://lore.kernel.org/lkml/4f66af3b47ba241380f8092e08879aca6d7c35b3.1548052878.git.baolin.wang@linaro.org/
> 
> This context could go into the commit message I think, as justification
> for making the interrupt required.

TBH I'm not 100% sure that the interrupt is required, I just looked at
the Linux driver, and that it returns from probe if it doesn't get the IRQ.

> 
> Also, this binding is odd in that it has several compatibles in an enum,
> but the driver (added at the same time) only has one compatible in it.

I think the intent was to document the entire sc27xx series of PMICs, as
they're supposedly very similar (this is just my guess), while initially
adding support only for sc2731.

> Are you using the sc2731 in your device?

No, I do not have any such device.

Regards,
Stanislav