linux-kernel - Re: [PATCH v2 4/5] soc/tegra: pmc: Use of_clk_get_parent

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Date:   Wed, 11 Apr 2018 10:07:47 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Thierry Reding <thierry.reding@...il.com>,
        <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-rockchip@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] soc/tegra: pmc: Use of_clk_get_parent_count()
 instead of open coding


On 10/04/18 13:51, Geert Uytterhoeven wrote:
> As of_clk_get_parent_count() returns zero on failure, while
> of_count_phandle_with_args() might return a negative error code, this
> also fixes the issue of possibly using a very big number in the
> allocation below.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> This depends on "[PATCH v2 1/5] clk: Extract OF clock helpers in
> <linux/of_clk.h>".
> 
> v2:
>   - of_clk_get_parent_count() was moved to <linux/of_clk.h>.
> ---
>  drivers/soc/tegra/pmc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index d9fcdb592b3966a5..d8cb48a4b8eb1b78 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -31,6 +31,7 @@
>  #include <linux/iopoll.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> +#include <linux/of_clk.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_domain.h>
> @@ -725,7 +726,7 @@ static int tegra_powergate_of_get_clks(struct tegra_powergate *pg,
>  	unsigned int i, count;
>  	int err;
>  
> -	count = of_count_phandle_with_args(np, "clocks", "#clock-cells");
> +	count = of_clk_get_parent_count(np);
>  	if (count == 0)
>  		return -ENODEV;
>  
> 

Acked-by: Jon Hunter <jonathanh@...dia.com>

Cheers
Jon