linux-kernel - Re: [PATCH v1 3/4] soc: starfive: Add StarFive JH71XX pmu driver

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Message-ID: <Y385J2m5YByyAz0g@wendy>
Date:   Thu, 24 Nov 2022 09:28:07 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Walker Chen <walker.chen@...rfivetech.com>
CC:     Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        <linux-riscv@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 3/4] soc: starfive: Add StarFive JH71XX pmu driver

Hey Walker,
Just jumping in here...

On Thu, Nov 24, 2022 at 05:08:57PM +0800, Walker Chen wrote:
> On 2022/11/19 2:31, Emil Renner Berthing wrote:
> > On Fri, 18 Nov 2022 at 14:35, Walker Chen <walker.chen@...rfivetech.com> wrote:

> >> diff --git a/include/soc/starfive/pm_domains.h b/include/soc/starfive/pm_domains.h
> >> new file mode 100644
> >> index 000000000000..a20e28e9baf3
> >> --- /dev/null
> >> +++ b/include/soc/starfive/pm_domains.h
> >> @@ -0,0 +1,15 @@
> >> +/* SPDX-License-Identifier: GPL-2.0 */
> >> +/*
> >> + * Copyright (C) 2022 StarFive Technology Co., Ltd.
> >> + * Author: Walker Chen <walker.chen@...rfivetech.com>
> >> + */
> >> +
> >> +#ifndef __SOC_STARFIVE_PMDOMAINS_H__
> >> +#define __SOC_STARFIVE_PMDOMAINS_H__
> >> +
> >> +#include <linux/types.h>
> >> +
> >> +void starfive_pmu_hw_event_turn_on(u32 mask);
> >> +void starfive_pmu_hw_event_turn_off(u32 mask);
> >> +
> >> +#endif /* __SOC_STARFIVE_PMDOMAINS_H__ */
> > 
> > The header and functions within are named very generic, but
> > implemented by the jh71xx-specific driver.
> > 
> > Also who should use this header? These functions are never called by
> > anything in this series.
> 
> These two functions will be used by the GPU module. Only the power-off
> of the GPU is not controlled by the software through PMU module. So
> here the functions are needed to export.

...the general policy is to avoid adding things without users. I think
they should be kept as static functions for now & when your GPU driver
is being upstreamed you can expose these functions. That way your usage
of them can be reviewed with the appropriate context.

Thanks,
Conor.