netdev - Re: [PATCH net-next] net: phy: disregard "Clause 22 registers present" bit in get_phy_c45_devs_in

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Message-ID: <20190208140206.GE26594@lunn.ch>
Date:   Fri, 8 Feb 2019 15:02:06 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: phy: disregard "Clause 22 registers
 present" bit in get_phy_c45_devs_in_pkg

On Fri, Feb 08, 2019 at 08:12:47AM +0100, Heiner Kallweit wrote:
> Bit 0 in register 1.5 doesn't represent a device but is a flag that
> Clause 22 registers are present. Therefore disregard this bit when
> populating the device list. If code needs this information it
> should read register 1.5 directly instead of accessing the device
> list. Because this bit doesn't represent a device I didn't add a
> MDIO_MMD_C22PRESENT constant or similar.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/phy/phy_device.c | 3 ++-
>  include/uapi/linux/mdio.h    | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 9369e1323..c2316a117 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -682,7 +682,8 @@ static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
>  	phy_reg = mdiobus_read(bus, addr, reg_addr);
>  	if (phy_reg < 0)
>  		return -EIO;
> -	*devices_in_package |= (phy_reg & 0xffff);
> +	/* Bit 0 doesn't represent a device, it indicates c22 regs presence */
> +	*devices_in_package |= (phy_reg & 0xfffe);

Hi Heiner

Just for readability, can we use BIT(0) in there somehow?

>  
>  	return 0;
>  }
> diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h
> index 2e6e309f0..0e012b168 100644
> --- a/include/uapi/linux/mdio.h
> +++ b/include/uapi/linux/mdio.h
> @@ -115,6 +115,7 @@
>  
>  /* Device present registers. */
>  #define MDIO_DEVS_PRESENT(devad)	(1 << (devad))
> +#define MDIO_DEVS_C22PRESENT		MDIO_DEVS_PRESENT(0)

Err. The commit message says you did not add this...

     Andrew