linux-kernel - Re: [PATCH v11 3/4] phy: Add Sparx5 ethernet serdes PHY driver

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Date:   Mon, 4 Jan 2021 14:15:02 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Steen Hegelund <steen.hegelund@...rochip.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Microchip UNG Driver List <UNGLinuxDriver@...rochip.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v11 3/4] phy: Add Sparx5 ethernet serdes PHY driver

On Mon, Jan 04, 2021 at 09:22:17AM +0100, Steen Hegelund wrote:
> Add the Microchip Sparx5 ethernet serdes PHY driver for the 6G, 10G and 25G
> interfaces available in the Sparx5 SoC.
>
> Signed-off-by: Bjarni Jonasson <bjarni.jonasson@...rochip.com>
> Signed-off-by: Steen Hegelund <steen.hegelund@...rochip.com>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> ---
>  drivers/phy/Kconfig                        |    1 +
>  drivers/phy/Makefile                       |    1 +
>  drivers/phy/microchip/Kconfig              |   12 +
>  drivers/phy/microchip/Makefile             |    6 +
>  drivers/phy/microchip/sparx5_serdes.c      | 2443 ++++++++++++++++++
>  drivers/phy/microchip/sparx5_serdes.h      |  129 +
>  drivers/phy/microchip/sparx5_serdes_regs.h | 2695 ++++++++++++++++++++
>  7 files changed, 5287 insertions(+)
>  create mode 100644 drivers/phy/microchip/Kconfig
>  create mode 100644 drivers/phy/microchip/Makefile
>  create mode 100644 drivers/phy/microchip/sparx5_serdes.c
>  create mode 100644 drivers/phy/microchip/sparx5_serdes.h
>  create mode 100644 drivers/phy/microchip/sparx5_serdes_regs.h
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 00dabe5fab8a..df35c752f3aa 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -70,6 +70,7 @@ source "drivers/phy/ingenic/Kconfig"
>  source "drivers/phy/lantiq/Kconfig"
>  source "drivers/phy/marvell/Kconfig"
>  source "drivers/phy/mediatek/Kconfig"
> +source "drivers/phy/microchip/Kconfig"
>  source "drivers/phy/motorola/Kconfig"
>  source "drivers/phy/mscc/Kconfig"
>  source "drivers/phy/qualcomm/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 32261e164abd..adac1b1a39d1 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -20,6 +20,7 @@ obj-y					+= allwinner/	\
>  					   lantiq/	\
>  					   marvell/	\
>  					   mediatek/	\
> +					   microchip/	\
>  					   motorola/	\
>  					   mscc/	\
>  					   qualcomm/	\
> diff --git a/drivers/phy/microchip/Kconfig b/drivers/phy/microchip/Kconfig
> new file mode 100644
> index 000000000000..0b1a818e01b8

<...>

> +struct sparx5_sd10g28_args {
> +	bool                 skip_cmu_cfg; /* Enable/disable CMU cfg */
> +	bool                 no_pwrcycle;  /* Omit initial power-cycle */
> +	bool                 txinvert;     /* Enable inversion of output data */
> +	bool                 rxinvert;     /* Enable inversion of input data */
> +	bool                 txmargin;     /* Set output level to  half/full */
> +	u16                  txswing;      /* Set output level */
> +	bool                 mute;         /* Mute Output Buffer */
> +	bool                 is_6g;
> +	bool                 reg_rst;
> +};

All those bools in structs can be squeezed into one u8, just use
bitfields, e.g. "u8 a:1;".

Also I strongly advise do not do vertical alignment, it will cause to
too many churn later when this code will be updated.

> +

<...>

> +static inline void __iomem *sdx5_addr(void __iomem *base[],
> +				      int id, int tinst, int tcnt,
> +				      int gbase, int ginst,
> +				      int gcnt, int gwidth,
> +				      int raddr, int rinst,
> +				      int rcnt, int rwidth)
> +{
> +#if defined(CONFIG_DEBUG_KERNEL)
> +	WARN_ON((tinst) >= tcnt);
> +	WARN_ON((ginst) >= gcnt);
> +	WARN_ON((rinst) >= rcnt);
> +#endif

Please don't put "#if defined(CONFIG_DEBUG_KERNEL)", print WARN_ON().

Thanks