linux-kernel - Re: [PATCH v2] mfd: syscon: Use a unique name with regmap

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Date:   Thu, 30 Jan 2020 17:34:15 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Suman Anna <s-anna@...com>
Cc:     Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        David Lechner <david@...hnology.com>,
        Tony Lindgren <tony@...mide.com>,
        Roger Quadros <rogerq@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v2] mfd: syscon: Use a unique name with regmap_config

On Tue, Jan 28, 2020 at 1:14 AM Suman Anna <s-anna@...com> wrote:
>
> The DT node full name is currently being used in regmap_config
> which in turn is used to create the regmap debugfs directories.
> This name however is not guaranteed to be unique and the regmap
> debugfs registration can fail in the cases where the syscon nodes
> have the same unit-address but are present in different DT node
> hierarchies. Replace this logic using the syscon reg resource
> address instead (inspired from logic used while creating platform
> devices) to ensure a unique name is given for each syscon.

> -       syscon_config.name = of_node_full_name(np);
> +       syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@...x", np,
> +                                      (u64)res.start);

Explicit castings in printf() usually tell us that something is not okay.
Yes, for resource_size_t we have %pa.

On top of that, I would rather see %pfwn to avoid modification for
other fwnode types.

-- 
With Best Regards,
Andy Shevchenko