linux-kernel - Re: [PATCH 3/6] clk: mvebu: add CPU clock driver for Armada 7K/8K

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Message-ID: <87wooymqo3.fsf@bootlin.com>
Date:   Tue, 27 Nov 2018 17:27:40 +0100
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH 3/6] clk: mvebu: add CPU clock driver for Armada 7K/8K

Hi Stephen,
 
 On ven., nov. 16 2018, Gregory CLEMENT <gregory.clement@...tlin.com> wrote:

>>> +static int ap_cpu_clock_probe(struct platform_device *pdev)
>>> +{
>>> +       int ret, nclusters = 0, cluster_index = 0;
>>> +       struct device *dev = &pdev->dev;
>>> +       struct device_node *dn, *np = dev->of_node;
>>> +       struct ap_cpu_clk *ap_cpu_clk;
>>> +       struct regmap *regmap;
>>> +
>>> +       regmap = syscon_node_to_regmap(np->parent);
>>
>> Can we just call dev_get_remap() on pdev->dev.parent?
>
> we could do regmap = dev_get_regmap(pdev->dev.parent, NULL); instead of
> this line. But is it really better?

Actually we can't, because we really depend on a syscon and at this
moment there is no regmap. It is the syscon_node_to_regmap function which
creates this regmap when needed.

Gregory

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com