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References: <20190521060952.2949-1-zhang.chunyan@linaro.org> <20190521060952.2949-2-zhang.chunyan@linaro.org>
In-Reply-To: <20190521060952.2949-2-zhang.chunyan@linaro.org>
From:   Baolin Wang <baolin.wang@linaro.org>
Date:   Tue, 21 May 2019 14:38:03 +0800
Message-ID: <CAMz4kuLjOjKGXn7QtOO5Gizo-FZ7CDf2SiczTNPwDgjAKzm2pw@mail.gmail.com>
Subject: Re: [PATCH 1/2] clk: sprd: Switch from of_iomap() to devm_ioremap_resource()
To:     Chunyan Zhang <zhang.chunyan@linaro.org>
Cc:     Stephen Boyd <sboyd@kernel.org>, linux-clk@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Orson Zhai <orsonzhai@gmail.com>,
        Chunyan Zhang <zhang.lyra@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Chunyan,

On Tue, 21 May 2019 at 14:15, Chunyan Zhang <zhang.chunyan@linaro.org> wrote:
>
> devm_ioremap_resources() automatically requests resources and devm_ wrappers
> do better error handling and unmapping of the I/O region when needed,
> that would make drivers more clean and simple.
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
> ---
>  drivers/clk/sprd/common.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clk/sprd/common.c b/drivers/clk/sprd/common.c
> index e038b0447206..a5bdca1de5d0 100644
> --- a/drivers/clk/sprd/common.c
> +++ b/drivers/clk/sprd/common.c
> @@ -42,6 +42,7 @@ int sprd_clk_regmap_init(struct platform_device *pdev,
>         void __iomem *base;
>         struct device_node *node = pdev->dev.of_node;
>         struct regmap *regmap;
> +       struct resource *res;
>
>         if (of_find_property(node, "sprd,syscon", NULL)) {
>                 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
> @@ -50,10 +51,14 @@ int sprd_clk_regmap_init(struct platform_device *pdev,
>                         return PTR_ERR(regmap);
>                 }
>         } else {
> -               base = of_iomap(node, 0);
> +               res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +               base = devm_ioremap_resource(&pdev->dev, res);
> +               if (IS_ERR(base))
> +                       return PTR_ERR(base);
> +
>                 regmap = devm_regmap_init_mmio(&pdev->dev, base,
>                                                &sprdclk_regmap_config);
> -               if (IS_ERR_OR_NULL(regmap)) {
> +               if (IS_ERR(regmap)) {

You did not mention this fix in your commit message, and it's better
to move into one separate patch.

>                         pr_err("failed to init regmap\n");
>                         return PTR_ERR(regmap);
>                 }
> --
> 2.17.1
>


-- 
Baolin Wang
Best Regards