linux-kernel - Re: [PATCH mfd v1] mfd: Add Renesas Synchronization Management Unit (SMU) support

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Date:   Wed, 26 May 2021 09:01:24 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Min Li <min.li.xe@...esas.com>
Cc:     "sameo@...ux.intel.com" <sameo@...ux.intel.com>,
        "grant.likely@...aro.org" <grant.likely@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH mfd v1] mfd: Add Renesas Synchronization Management Unit
 (SMU) support

On Tue, 25 May 2021, Min Li wrote:
> > Why do you need to track how many there are?
> > 
> > We don't usually do that at all.

You've cut away all of the context.

Please keep all the context so that we and others know what we're
referencing.

> It is used to index the mfd_cell array, rsmu_cdev[RSMU_MAX_MFD_DEV]

Why do you need to index the array?

The devices look identical to me.

Just have one entry for each type and register them in a for() loop.

> The index is also used to enumerate the rsmu character device, say /dev/rsmu[0/1/2/3]

You should be able to use platform_id or a similar built-in counting
mechanism.  There shouldn't be any requirement for you to hand-roll
your own device counting solution.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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