From: <Parthiban.Veerasooran@microchip.com>
To: <andrew@lunn.ch>
Cc: <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
<pabeni@redhat.com>, <horms@kernel.org>, <saeedm@nvidia.com>,
<anthony.l.nguyen@intel.com>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <corbet@lwn.net>,
<linux-doc@vger.kernel.org>, <robh+dt@kernel.org>,
<krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
<devicetree@vger.kernel.org>, <Horatiu.Vultur@microchip.com>,
<ruanjinjie@huawei.com>, <Steen.Hegelund@microchip.com>,
<vladimir.oltean@nxp.com>, <UNGLinuxDriver@microchip.com>,
<Thorsten.Kummermehr@microchip.com>, <Pier.Beruto@onsemi.com>,
<Selvamani.Rajagopal@onsemi.com>, <Nicolas.Ferre@microchip.com>,
<benjamin.bigler@bernformulastudent.ch>
Subject: Re: [PATCH net-next v4 06/12] net: ethernet: oa_tc6: implement internal PHY initialization
Date: Fri, 26 Apr 2024 13:17:23 +0000 [thread overview]
Message-ID: <738b10fd-9bb6-433b-900e-5571e392f347@microchip.com> (raw)
In-Reply-To: <aae5f0be-7e1f-443e-831a-ab0b4df0b839@lunn.ch>
Hi Andrew,
On 24/04/24 5:18 am, Andrew Lunn wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
>> +/* PHY Clause 22 and 29 registers base address and mask */
>> +#define OA_TC6_PHY_STD_REG_ADDR_BASE 0xFF00
>> +#define OA_TC6_PHY_STD_REG_ADDR_MASK 0x3F
>
> Did you every find out why C29 is reference here? From the standard:
>
> 29. System considerations for multisegment 100BASE-T networks
>
> NOTE—This clause relates to clauses that are not recommended for new
> installations. This clause is not recommended for new
> installations. Since March 2012, maintenance changes are no longer
> being considered for this clause.
>
> I don't think you should be referencing it in the code.
Thanks for this detailed explanation. The reason why I considered this
is, in section 9.2 and table 7 of the OPEN Alliance document shows the
mapping of standard registers within MMS 0 where clause 29 also listed
as clause 22 extended registers from 0xFF20 to 0xFF3F.
https://opensig.org/download/document/OPEN_Alliance_10BASET1x_MAC-PHY_Serial_Interface_V1.1.pdf
But by considering the limitations explained by you above, I will change
the mask as 0x1F to support only for clause 22 registers in the next
version.
>
>> +static int oa_tc6_mdiobus_read(struct mii_bus *bus, int addr, int regnum)
>> +{
>> + struct oa_tc6 *tc6 = bus->priv;
>> + u32 regval;
>> + bool ret;
>> +
>> + ret = oa_tc6_read_register(tc6, OA_TC6_PHY_STD_REG_ADDR_BASE |
>> + (regnum & OA_TC6_PHY_STD_REG_ADDR_MASK),
>> + ®val);
>> + if (ret)
>> + return -ENODEV;
>
> In general, you should not replace an error code from a lower level
> function with a different error code. If there is a good reason to do
> this, please add a comment.
Ah ok, I will return "ret" in the next version.
>
>> diff --git a/drivers/net/phy/microchip_t1s.c b/drivers/net/phy/microchip_t1s.c
>> index 534ca7d1b061..769a88254285 100644
>> --- a/drivers/net/phy/microchip_t1s.c
>> +++ b/drivers/net/phy/microchip_t1s.c
>> @@ -268,6 +268,34 @@ static int lan86xx_read_status(struct phy_device *phydev)
>> return 0;
>> }
>
> Please put this into a new patch.
OK, will create as a new patch in the next version.
>
>>
>> +/* OPEN Alliance 10BASE-T1x compliance MAC-PHYs will have both C22 and
>> + * C45 registers space. If the PHY is discovered via C22 bus protocol it assumes
>> + * it uses C22 protocol and always uses C22 registers indirect access to access
>> + * C45 registers. This is because, we don't have a clean separation between
>> + * C22/C45 register space and C22/C45 MDIO bus protocols. Resulting, PHY C45
>> + * registers direct access can't be used which can save multiple SPI bus access.
>> + * To support this feature, set .read_mmd/.write_mmd in the PHY driver to call
>> + * .read_c45/.write_c45 in the OPEN Alliance framework
>> + * drivers/net/ethernet/oa_tc6.c
>> + */
>> +static int lan865x_phy_read_mmd(struct phy_device *phydev, int devnum,
>> + u16 regnum)
>> +{
>> + struct mii_bus *bus = phydev->mdio.bus;
>> + int addr = phydev->mdio.addr;
>> +
>> + return bus->read_c45(bus, addr, devnum, regnum);
>
> It is better to use __mdiobus_c45_read(). That will check you have the
> lock held, won't jump through a null pointer if the bus does not
> implement C45, does tracing, and increments the MDIO statistics.
OK, sure will do it in the next version. As this is also applicable for
__mdiobus_c45_write(), I will change this as well.
Best regards,
Parthiban V
>
> Andrew
>
next prev parent reply other threads:[~2024-04-26 13:17 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-18 12:56 [PATCH net-next v4 00/12] Add support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface Parthiban Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 01/12] Documentation: networking: add OPEN Alliance 10BASE-T1x MAC-PHY serial interface Parthiban Veerasooran
2024-04-28 9:33 ` Bagas Sanjaya
2024-04-29 11:31 ` Parthiban.Veerasooran
2024-04-29 16:17 ` Simon Horman
2024-04-30 11:30 ` Parthiban.Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 02/12] net: ethernet: oa_tc6: implement register write operation Parthiban Veerasooran
2024-04-22 23:48 ` Andrew Lunn
2024-04-23 4:38 ` Parthiban.Veerasooran
2024-04-23 23:14 ` Andrew Lunn
2024-04-26 5:55 ` Parthiban.Veerasooran
2024-04-29 16:36 ` Simon Horman
2024-04-30 8:14 ` Parthiban.Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 03/12] net: ethernet: oa_tc6: implement register read operation Parthiban Veerasooran
2024-04-23 23:17 ` Andrew Lunn
2024-04-26 5:56 ` Parthiban.Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 04/12] net: ethernet: oa_tc6: implement software reset Parthiban Veerasooran
2024-04-23 23:26 ` Andrew Lunn
2024-04-26 6:38 ` Parthiban.Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error interrupts unmasking Parthiban Veerasooran
2024-04-23 23:27 ` Andrew Lunn
2024-04-27 19:52 ` Ramón Nordin Rodriguez
2024-04-27 21:17 ` Andrew Lunn
2024-04-27 21:55 ` Ramón Nordin Rodriguez
2024-04-28 14:48 ` Andrew Lunn
2024-04-28 9:54 ` Ramón Nordin Rodriguez
2024-04-28 14:59 ` Andrew Lunn
2024-04-28 22:04 ` Ramón Nordin Rodriguez
2024-05-01 18:29 ` Ramón Nordin Rodriguez
2024-05-01 19:58 ` Andrew Lunn
2024-05-01 20:07 ` Andrew Lunn
2024-05-02 10:10 ` Parthiban.Veerasooran
2024-05-02 10:19 ` Ramón Nordin Rodriguez
2024-05-03 7:10 ` Parthiban.Veerasooran
2024-05-06 1:21 ` Andrew Lunn
2024-05-06 6:47 ` Piergiorgio Beruto
2024-05-07 12:44 ` Ramón Nordin Rodriguez
2024-05-13 6:41 ` Ramón Nordin Rodriguez
2024-05-13 13:00 ` Andrew Lunn
2024-05-13 13:50 ` Ramón Nordin Rodriguez
2024-05-13 14:04 ` Andrew Lunn
2024-05-15 21:45 ` Ramón Nordin Rodriguez
2024-05-14 4:46 ` Parthiban.Veerasooran
2024-05-15 21:48 ` Ramón Nordin Rodriguez
2024-05-17 9:38 ` Parthiban.Veerasooran
2024-05-17 12:43 ` Ramón Nordin Rodriguez
2024-05-24 18:12 ` Ramón Nordin Rodriguez
2024-05-24 18:31 ` Andrew Lunn
2024-05-24 18:49 ` Piergiorgio Beruto
2024-05-27 9:30 ` Parthiban.Veerasooran
2024-05-27 8:38 ` Parthiban.Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 06/12] net: ethernet: oa_tc6: implement internal PHY initialization Parthiban Veerasooran
2024-04-23 23:48 ` Andrew Lunn
2024-04-26 13:17 ` Parthiban.Veerasooran [this message]
2024-04-18 12:56 ` [PATCH net-next v4 07/12] net: ethernet: oa_tc6: enable open alliance tc6 data communication Parthiban Veerasooran
2024-04-23 23:49 ` Andrew Lunn
2024-04-18 12:56 ` [PATCH net-next v4 08/12] net: ethernet: oa_tc6: implement transmit path to transfer tx ethernet frames Parthiban Veerasooran
2024-04-24 0:02 ` Andrew Lunn
2024-04-26 13:19 ` Parthiban.Veerasooran
2024-04-18 12:56 ` [PATCH net-next v4 09/12] net: ethernet: oa_tc6: implement receive path to receive rx " Parthiban Veerasooran
2024-04-24 0:08 ` Andrew Lunn
2024-04-26 13:45 ` Parthiban.Veerasooran
2024-04-26 18:13 ` Andrew Lunn
2024-04-29 6:13 ` Parthiban.Veerasooran
2024-04-27 20:02 ` Ramón Nordin Rodriguez
2024-04-29 8:32 ` Parthiban.Veerasooran
2024-04-29 10:45 ` Ramón Nordin Rodriguez
2024-04-18 12:56 ` [PATCH net-next v4 10/12] net: ethernet: oa_tc6: implement mac-phy interrupt Parthiban Veerasooran
2024-04-24 0:10 ` Andrew Lunn
2024-04-18 12:56 ` [PATCH net-next v4 11/12] microchip: lan865x: add driver support for Microchip's LAN865X MAC-PHY Parthiban Veerasooran
2024-04-24 0:27 ` Andrew Lunn
2024-04-26 13:32 ` Parthiban.Veerasooran
2024-04-26 18:14 ` Andrew Lunn
2024-04-29 6:13 ` Parthiban.Veerasooran
2024-04-27 19:19 ` Ramón Nordin Rodriguez
2024-04-27 19:57 ` Conor Dooley
2024-04-27 20:13 ` Ramón Nordin Rodriguez
2024-04-27 20:22 ` Conor Dooley
2024-04-27 21:09 ` Ramón Nordin Rodriguez
2024-04-29 9:47 ` Parthiban.Veerasooran
2024-04-29 12:09 ` Andrew Lunn
2024-04-30 13:30 ` Parthiban.Veerasooran
2024-04-30 16:55 ` Conor Dooley
2024-05-02 5:56 ` Parthiban.Veerasooran
2024-04-27 20:40 ` Andrew Lunn
2024-04-27 21:06 ` Ramón Nordin Rodriguez
2024-04-28 14:18 ` Andrew Lunn
2024-04-27 19:35 ` Ramón Nordin Rodriguez
2024-04-27 20:58 ` Andrew Lunn
2024-04-27 21:29 ` Ramón Nordin Rodriguez
2024-04-28 14:25 ` Andrew Lunn
2024-04-28 22:00 ` Ramón Nordin Rodriguez
2024-04-18 12:56 ` [PATCH net-next v4 12/12] dt-bindings: net: add Microchip's LAN865X 10BASE-T1S MACPHY Parthiban Veerasooran
2024-04-18 15:39 ` Conor Dooley
2024-04-22 3:59 ` Parthiban.Veerasooran
2024-04-22 15:50 ` Conor Dooley
2024-04-23 3:27 ` Parthiban.Veerasooran
2024-04-22 20:07 ` [PATCH net-next v4 00/12] Add support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface Andrew Lunn
2024-04-22 20:08 ` Andrew Lunn
2024-04-22 23:23 ` Andrew Lunn
2024-05-08 13:05 ` Parthiban.Veerasooran
2024-05-08 17:04 ` Andrew Lunn
2024-05-09 13:04 ` Parthiban.Veerasooran
2024-05-09 20:39 ` Andrew Lunn
2024-05-10 11:22 ` Parthiban.Veerasooran
2024-05-24 20:52 ` Selvamani Rajagopal
2024-05-24 21:27 ` Andrew Lunn
2024-05-24 21:45 ` Piergiorgio Beruto
2024-05-24 21:54 ` Andrew Lunn
2024-05-24 22:08 ` Piergiorgio Beruto
2024-05-25 14:46 ` Andrew Lunn
2024-05-30 9:43 ` Piergiorgio Beruto
2024-05-30 13:06 ` Andrew Lunn
2024-05-30 21:37 ` Piergiorgio Beruto
2024-05-31 0:33 ` Andrew Lunn
2024-05-31 12:13 ` Parthiban.Veerasooran
2024-05-31 12:37 ` Andrew Lunn
2024-05-31 15:13 ` Piergiorgio Beruto
2024-06-03 6:55 ` Parthiban.Veerasooran
2024-06-05 21:40 ` Selvamani Rajagopal
2024-06-05 23:43 ` Andrew Lunn
2024-06-06 0:35 ` Selvamani Rajagopal
2024-06-06 13:12 ` Andrew Lunn
2024-06-07 4:40 ` Selvamani Rajagopal
2024-06-03 6:55 ` Parthiban.Veerasooran
2024-04-22 23:43 ` Andrew Lunn
2024-04-28 21:16 ` [PATCH net-next v4 13/12] net: lan865x: optional hardware reset Ramón Nordin Rodriguez
2024-04-28 23:17 ` Andrew Lunn
2024-04-29 10:42 ` Ramón Nordin Rodriguez
2024-04-29 6:09 ` Parthiban.Veerasooran
2024-04-29 10:38 ` Ramón Nordin Rodriguez
2024-04-29 12:19 ` Andrew Lunn
2024-04-30 8:04 ` Ramón Nordin Rodriguez
2024-04-30 13:30 ` Parthiban.Veerasooran
2024-04-30 14:14 ` Andrew Lunn
2024-05-02 10:10 ` Parthiban.Veerasooran
2024-04-29 6:09 ` Krzysztof Kozlowski
2024-04-29 10:44 ` Ramón Nordin Rodriguez
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