linux-kernel - Re: [PATCH v6 1/2] clk: uniphier: add core support code for UniPhier clock driver

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Message-ID: <20160819191612.GU361@codeaurora.org>
Date:   Fri, 19 Aug 2016 12:16:12 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Turquette <mturquette@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v6 1/2] clk: uniphier: add core support code for UniPhier
 clock driver

On 08/20, Masahiro Yamada wrote:
> 2016-08-19 9:25 GMT+09:00 Stephen Boyd <sboyd@...eaurora.org>:
> >> +{
> >> +     struct device *dev = &pdev->dev;
> >> +     const struct of_device_id *match;
> >> +     struct clk_hw_onecell_data *hw_data;
> >> +     struct device_node *parent;
> >> +     struct regmap *regmap;
> >> +     const struct uniphier_clk_data *p;
> >> +     int clk_num = 0;
> >> +
> >> +     match = of_match_node(uniphier_clk_match, dev->of_node);
> >> +     if (!match)
> >> +             return -ENODEV;
> >
> > We can use of_driver_match_device() to make this simpler.
> 
> 
> I want to use the returned "match".
> The of_driver_match_device() just checks if it matches or not,
> so I do not think it can be the replacement.
> 
> I can use of_match_device() instead, if you like.

Sorry I meant of_device_get_match_data().

> 
> 
> 
> >> +
> >> +     parent = of_get_parent(dev->of_node); /* parent should be syscon node */
> >> +     regmap = syscon_node_to_regmap(parent);
> >> +     of_node_put(parent);
> >
> > devm_get_regmap(dev->parent) should work then? Why do we need to
> > use OF APIs?
> 
> "git grep devm_get_regmap" did not hit anything.
> 
> Where is it defined?
> 

Sorry I meant dev_get_regmap().

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