linux-kernel - Re: [PATCH net-next v7 8/8] mfd: zl3073x: Register DPLL sub-device during init

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Message-ID: <aBt1jXNRgtNVDcWC@smile.fi.intel.com>
Date: Wed, 7 May 2025 18:00:29 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ivan Vecera <ivecera@...hat.com>
Cc: netdev@...r.kernel.org, Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
	Jiri Pirko <jiri@...nulli.us>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Prathosh Satish <Prathosh.Satish@...rochip.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, Lee Jones <lee@...nel.org>,
	Michal Schmidt <mschmidt@...hat.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next v7 8/8] mfd: zl3073x: Register DPLL sub-device
 during init

On Wed, May 07, 2025 at 04:19:29PM +0200, Ivan Vecera wrote:
> On 07. 05. 25 3:41 odp., Andy Shevchenko wrote:
> > On Wed, May 7, 2025 at 3:45 PM Ivan Vecera <ivecera@...hat.com> wrote:

...

> > > +static const struct zl3073x_pdata zl3073x_pdata[ZL3073X_MAX_CHANNELS] = {
> > > +       { .channel = 0, },
> > > +       { .channel = 1, },
> > > +       { .channel = 2, },
> > > +       { .channel = 3, },
> > > +       { .channel = 4, },
> > > +};
> > 
> > > +static const struct mfd_cell zl3073x_devs[] = {
> > > +       ZL3073X_CELL("zl3073x-dpll", 0),
> > > +       ZL3073X_CELL("zl3073x-dpll", 1),
> > > +       ZL3073X_CELL("zl3073x-dpll", 2),
> > > +       ZL3073X_CELL("zl3073x-dpll", 3),
> > > +       ZL3073X_CELL("zl3073x-dpll", 4),
> > > +};
> > 
> > > +#define ZL3073X_MAX_CHANNELS   5
> > 
> > Btw, wouldn't be better to keep the above lists synchronised like
> > 
> > 1. Make ZL3073X_CELL() to use indexed variant
> > 
> > [idx] = ...
> > 
> > 2. Define the channel numbers
> > 
> > and use them in both data structures.
> > 
> It could be possible to drop zl3073x_pdata array and modify ZL3073X_CELL
> this way:
> 
> #define ZL3073X_CHANNEL(_channel)                               \
>         &(const struct zl3073x_pdata) { .channel = _channel }
> 
> #define ZL3073X_CELL(_name, _channel)                           \
>         MFD_CELL_BASIC(_name, NULL, ZL3073X_CHANNEL(_channel),  \
>                        sizeof(struct zl3073x_pdata), 0)
> 
> WDYT?

Fine with me as it looks not ugly and addresses my point.

-- 
With Best Regards,
Andy Shevchenko