linux-kernel - Re: [v8] clk: qcom: clk-rpmh: Add QCOM RPMh clock driver

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Message-ID: <152580143451.138124.11843604181263814941@swboyd.mtv.corp.google.com>
Date:   Tue, 08 May 2018 10:43:54 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Taniya Das <tdas@...eaurora.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Amit Nischal <anischal@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [v8] clk: qcom: clk-rpmh: Add QCOM RPMh clock driver

Quoting Taniya Das (2018-05-08 09:57:36)
> On 5/8/2018 5:58 AM, Stephen Boyd wrote:
> > Quoting Taniya Das (2018-05-07 03:48:06)
> >> Will be okay, if I can the following?
> >>
> >> _probe...
> >> {
> >>          struct clk_rpmh_desc *hw_desc_data;
> >>          ....
> >>
> >>          hw_desc_data = kmemdup(desc, sizeof(*desc), GFP_KERNEL);
> >>
> >>          ...
> >>          ret = devm_of_clk_add_hw_provider(&pdev->dev,     of_clk_rpmh_hw_get,
> >> hw_desc_data);
> >>           ....
> >>
> >> }
> >>
> >> And also I fix the "getter" function.
> > 
> > I'd rather see the check for out of bounds number just go away, unless
> > that's helping something. The kmemdup() doesn't look good.
> > 
> 
> I think it is better to copy the desc data to "clk_hw_onecell_data", as 
> I would also have to fix the "getter" function to check for out of bound 
> numbers (idx >= num_clks).
> 

Hmm ok. It would be nicer if we didn't have to duplicate the pointers
just because of const though. I'd rather have the cast away of const and
a comment indicating we know what we're doing. Maybe in the future we
can make the getter function take a const void pointer.