linux-kernel - Re: [PATCH 1/3] clk: s2mps11: Fix matching when built as module and DT node contains compatible

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Message-ID: <153256251231.48062.2127272830110571402@swboyd.mtv.corp.google.com>
Date:   Wed, 25 Jul 2018 16:48:32 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sangbeom Kim <sbkim73@...sung.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: s2mps11: Fix matching when built as module and DT node
 contains compatible

Quoting Krzysztof Kozlowski (2018-07-25 08:55:15)
> When driver is built as module and DT node contains clocks compatible
> (e.g. "samsung,s2mps11-clk"), the module will not be autoloaded because
> module aliases won't match.
> 
> The modalias from uevent: of:NclocksT<NULL>Csamsung,s2mps11-clk
> The modalias from driver: platform:s2mps11-clk
> 
> The devices are instantiated by parent's MFD.  However both Device Tree
> bindings and parent define the compatible for clocks devices.  In case
> of module matching this DT compatible will be used.
> 
> The issue will not happen if this is built-in (no need for module
> matching) or when clocks DT node does not contain compatible (not
> correct from bindings perspective but working for driver).
> 
> Note when backporting to stable kernels: adjust the list of device ID
> entries.
> 
> Cc: <stable@...r.kernel.org>
> Fixes: 53c31b3437a6 ("mfd: sec-core: Add of_compatible strings for clock MFD cells")
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---

Acked-by: Stephen Boyd <sboyd@...nel.org>