From: Suman Anna <s-anna@ti.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Lee Jones <lee.jones@linaro.org>, Arnd Bergmann <arnd@arndb.de>,
David Lechner <david@lechnology.com>,
Tony Lindgren <tony@atomide.com>, Roger Quadros <rogerq@ti.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
Linux OMAP Mailing List <linux-omap@vger.kernel.org>
Subject: Re: [PATCH v2] mfd: syscon: Use a unique name with regmap_config
Date: Thu, 30 Jan 2020 11:08:53 -0600 [thread overview]
Message-ID: <99a04c52-1ff6-1611-5cf6-2c71b810ba43@ti.com> (raw)
In-Reply-To: <CAHp75VfaOfBZYjQa960keORW=VjOn2PdwoYpJMG7SsN83daSJg@mail.gmail.com>
Hi Andy,
On 1/30/20 9:34 AM, Andy Shevchenko wrote:
> On Tue, Jan 28, 2020 at 1:14 AM Suman Anna <s-anna@ti.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@%llx", np,
>> + (u64)res.start);
>
> Explicit castings in printf() usually tell us that something is not okay.
Yes, I agree in general.
> Yes, for resource_size_t we have %pa.
And that was the first thing I tried when doing v2, before moving away
from it. This is not for a console printf statement, but is rather for
the regmap debugfs name. Using a %pa adds the 0x and leading zeros in
the debugfs name, when compared to the name before this patch. The
typecast retains the current format, and replaces the unit-address
without the leading 0s either. Introducing a local-variable to avoid the
typecast is overkill.
>
> On top of that, I would rather see %pfwn to avoid modification for
> other fwnode types.
Did you mean %pfwP? That can probably be handled when syscon code is
updated to use fwnode API.
regards
Suman
next prev parent reply other threads:[~2020-01-30 17:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-27 23:12 [PATCH v2] mfd: syscon: Use a unique name with regmap_config Suman Anna
2020-01-27 23:40 ` David Lechner
2020-01-28 0:27 ` Suman Anna
2020-01-30 15:34 ` Andy Shevchenko
2020-01-30 17:08 ` Suman Anna [this message]
2020-01-30 20:43 ` Andy Shevchenko
2020-02-24 10:00 ` Lee Jones
2020-03-06 0:29 ` Suman Anna
2020-07-24 16:06 ` Lee Jones
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