linux-kernel - Re: [PATCH v4 09/10] clk: add clk_rate

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Date:   Thu, 26 Oct 2017 07:26:13 +0200
From:   Michael Turquette <mturquette@...libre.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        "Stephen Boyd" <sboyd@...eaurora.org>
Cc:     "Jerome Brunet" <jbrunet@...libre.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Russell King" <linux@...linux.org.uk>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Quentin Schulz" <quentin.schulz@...e-electrons.com>,
        "Kevin Hilman" <khilman@...libre.com>
Subject: Re: [PATCH v4 09/10] clk: add clk_rate_exclusive api

Hi Jerome,

Quoting Jerome Brunet (2017-09-24 22:00:29)
> @@ -1778,6 +1867,50 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
>  EXPORT_SYMBOL_GPL(clk_set_rate);
>  
>  /**
> + * clk_set_rate_exclusive - specify a new rate get exclusive control
> + * @clk: the clk whose rate is being changed
> + * @rate: the new rate for clk
> + *
> + * This is a combination of clk_set_rate() and clk_rate_exclusive_get()
> + * within a critical section
> + *
> + * This can be used initially to ensure that at least 1 consumer is
> + * statisfied when several consumers are competing for exclusivity over the
> + * same clock provider.

Please add the following here:

  Calls to clk_rate_exclusive_get() should be balanced with calls to
  clk_rate_exclusive_put().

Otherwise looks good to me.

Best regards,
Mike