linux-kernel - Re: [PATCH net-next 1/2] net: phy: realtek: Add phy ids for RTL8226-CG/RTL8226B-CG

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Message-ID: <2cca91c7-99eb-3109-9958-c3db43a43a9b@gmail.com>
Date:   Thu, 29 Oct 2020 14:48:42 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Willy Liu <willy.liu@...ltek.com>
Cc:     linux@...linux.org.uk, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: phy: realtek: Add phy ids for
 RTL8226-CG/RTL8226B-CG

On 29.10.2020 14:37, Andrew Lunn wrote:
> On Thu, Oct 29, 2020 at 08:07:57PM +0800, Willy Liu wrote:
>> Realtek single-port 2.5Gbps Ethernet PHY ids as below:
>> RTL8226-CG: 0x001cc800(ES)/0x001cc838(MP)
>> RTL8226B-CG/RTL8221B-CG: 0x001cc840(ES)/0x001cc848(MP)
>> ES: engineer sample
>> MP: mass production
>>
>> Since above PHYs are already in mass production stage,
>> mass production id should be added.
>>
>> Signed-off-by: Willy Liu <willy.liu@...ltek.com>
>> ---
>>  drivers/net/phy/realtek.c | 18 ++++++++++++++----
>>  1 file changed, 14 insertions(+), 4 deletions(-)
>>  mode change 100644 => 100755 drivers/net/phy/realtek.c
>>
>> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
>> old mode 100644
>> new mode 100755
>> index fb1db71..988f075
>> --- a/drivers/net/phy/realtek.c
>> +++ b/drivers/net/phy/realtek.c
>> @@ -57,6 +57,9 @@
>>  #define RTLGEN_SPEED_MASK			0x0630
>>  
>>  #define RTL_GENERIC_PHYID			0x001cc800
>> +#define RTL_8226_MP_PHYID			0x001cc838
>> +#define RTL_8221B_ES_PHYID			0x001cc840
>> +#define RTL_8221B_MP_PHYID			0x001cc848
>>  
>>  MODULE_DESCRIPTION("Realtek PHY driver");
>>  MODULE_AUTHOR("Johnson Leung");
>> @@ -533,10 +536,17 @@ static int rtlgen_match_phy_device(struct phy_device *phydev)
>>  
>>  static int rtl8226_match_phy_device(struct phy_device *phydev)
>>  {
>> -	return phydev->phy_id == RTL_GENERIC_PHYID &&
>> +	return (phydev->phy_id == RTL_GENERIC_PHYID) ||
>> +	       (phydev->phy_id == RTL_8226_MP_PHYID) &&
>>  	       rtlgen_supports_2_5gbps(phydev);
> 
> Hi Willy
> 
> If i understand the code correctly, this match function is used
> because the engineering sample did not use a proper ID? The mass
> production part does, so there is no need to make use of this
> hack. Please just list it as a normal PHY using PHY_ID_MATCH_EXACT().
> 
Right. My understanding:
These PHY's exist as standalone chips and integrated with RTL8125 MAC.
IIRC for RTL8125A the integrated PHY reports RTL_GENERIC_PHYID, since
RTL8125B it reports the same PHYID as the standalone model.