linux-kernel - RE: [PATCH v4 1/8] clk: clkdev/of_clk - add managed lookup and provider registrations

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Message-ID: <042F8805D2046347BB8420BEAE397A4066F2E07D@WILL-MAIL001.REu.RohmEu.com>
Date:   Tue, 4 Dec 2018 18:59:24 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     Stephen Boyd <sboyd@...nel.org>
CC:     "mazziesaccount@...il.com" <mazziesaccount@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Michael Turquette <mturquette@...libre.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "Bartlomiej Zolnierkiewicz" <b.zolnierkie@...sung.com>,
        Russell King <linux@...linux.org.uk>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        "Guenter Roeck" <linux@...ck-us.net>,
        Rob Herring <robh@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Huang Shijie <sjhuang@...vatar.ai>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Akshu Agrawal <akshu.agrawal@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-soc@...r.kernel.org" <linux-soc@...r.kernel.org>
Subject: RE: [PATCH v4 1/8] clk: clkdev/of_clk - add managed lookup and
 provider registrations

Hello Stephen,
.
> > I think we should use parent device's node, not the paren node in DT,
> > right? But I agree, we should only look "one level up in the chain".

> Are these two things different? I'm suggesting looking at
> device_node::parent and trying to find a #clock-cells property.

I thought that MFD sub-devices may completely lack the DT node but I will verify this tomorrow. BTW, I already did the patch version 6 which checks the dev->parent->of_node if #clock-cells is not found from device's own node or if own node is NULL.

Br. Matti Vaittinen