linux-kernel - Re: [PATCH v3 1/2] phy: Add new PHY attribute max_link

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Date:   Mon, 13 Jul 2020 16:41:20 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Swapnil Jakhade <sjakhade@...ence.com>
Cc:     kishon@...com, linux-kernel@...r.kernel.org, maxime@...no.tech,
        mparab@...ence.com, yamonkar@...ence.com, nsekhar@...com,
        tomi.valkeinen@...com, jsarha@...com, praneeth@...com
Subject: Re: [PATCH v3 1/2] phy: Add new PHY attribute max_link_rate and APIs
 to get/set PHY attributes

On 13-07-20, 11:38, Swapnil Jakhade wrote:
> Add new PHY attribute max_link_rate to struct phy_attrs.
> Add a pair of PHY APIs to get/set all the PHY attributes.
> Use phy_set_attrs() to set attribute values in the PHY provider driver.
> Use phy_get_attrs() to get attribute values in the controller driver.
> 
> Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
> Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
> ---
>  include/linux/phy/phy.h | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index bcee8eba62b3..7fb59359ab7b 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -115,10 +115,12 @@ struct phy_ops {
>  /**
>   * struct phy_attrs - represents phy attributes
>   * @bus_width: Data path width implemented by PHY
> + * @max_link_rate: Maximum link rate supported by PHY (in Mbps)
>   * @mode: PHY mode
>   */
>  struct phy_attrs {
>  	u32			bus_width;
> +	u32			max_link_rate;
>  	enum phy_mode		mode;
>  };
>  
> @@ -231,6 +233,16 @@ static inline void phy_set_bus_width(struct phy *phy, int bus_width)
>  {
>  	phy->attrs.bus_width = bus_width;
>  }
> +
> +static inline void phy_get_attrs(struct phy *phy, struct phy_attrs *attrs)
> +{
> +	memcpy(attrs, &phy->attrs, sizeof(struct phy_attrs));
> +}
> +
> +static inline void phy_set_attrs(struct phy *phy, struct phy_attrs attrs)
> +{
> +	memcpy(&phy->attrs, &attrs, sizeof(struct phy_attrs));
> +}

we already have APIs for mode and bus_width so why not add one for
link_rate and call them?

Also I see you are using phy_set_attrs() in second patch, why add
phy_get_attrs() when we have no user?

>  struct phy *phy_get(struct device *dev, const char *string);
>  struct phy *phy_optional_get(struct device *dev, const char *string);
>  struct phy *devm_phy_get(struct device *dev, const char *string);
> @@ -389,6 +401,16 @@ static inline void phy_set_bus_width(struct phy *phy, int bus_width)
>  	return;
>  }
>  
> +static inline void phy_get_attrs(struct phy *phy, struct phy_attrs *attrs)
> +{
> +	return;
> +}
> +
> +static inline void phy_set_attrs(struct phy *phy, struct phy_attrs attrs)
> +{
> +	return;
> +}
> +
>  static inline struct phy *phy_get(struct device *dev, const char *string)
>  {
>  	return ERR_PTR(-ENOSYS);
> -- 
> 2.26.1

-- 
~Vinod