linux-kernel - Re: [PATCH v4 2/3] phy: core: add debugfs root

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Date:   Thu, 24 Nov 2022 23:09:13 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Eddie Hung <eddie.hung@...iatek.com>,
        Tianping Fang <tianping.fang@...iatek.com>
Subject: Re: [PATCH v4 2/3] phy: core: add debugfs root

On 10-11-22, 21:27, Chunfeng Yun wrote:
> Add a debugfs root for phy class, then phy drivers can add debugfs files
> under this folder.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
> v2~v4: no changes
> ---
>  drivers/phy/phy-core.c  | 6 ++++++
>  include/linux/phy/phy.h | 2 ++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index d93ddf1262c5..2f9f69190519 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -11,6 +11,7 @@
>  #include <linux/export.h>
>  #include <linux/module.h>
>  #include <linux/err.h>
> +#include <linux/debugfs.h>
>  #include <linux/device.h>
>  #include <linux/slab.h>
>  #include <linux/of.h>
> @@ -1204,6 +1205,9 @@ void devm_of_phy_provider_unregister(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
>  
> +struct dentry *phy_debug_root;
> +EXPORT_SYMBOL_GPL(phy_debug_root);

Why expose this to whole world? Alternate approach would be to add this
in struct phy

> +
>  /**
>   * phy_release() - release the phy
>   * @dev: the dev member within phy
> @@ -1233,6 +1237,8 @@ static int __init phy_core_init(void)
>  
>  	phy_class->dev_release = phy_release;
>  
> +	phy_debug_root = debugfs_create_dir("phy", NULL);
> +
>  	return 0;
>  }
>  device_initcall(phy_core_init);
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index b1413757fcc3..c398749d49b9 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -205,6 +205,8 @@ struct phy_lookup {
>  #define devm_of_phy_provider_register_full(dev, children, xlate) \
>  	__devm_of_phy_provider_register(dev, children, THIS_MODULE, xlate)
>  
> +extern struct dentry *phy_debug_root;
> +
>  static inline void phy_set_drvdata(struct phy *phy, void *data)
>  {
>  	dev_set_drvdata(&phy->dev, data);
> -- 
> 2.18.0

-- 
~Vinod