From: Dan Murphy <dmurphy@ti.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: <f.fainelli@gmail.com>, <hkallweit1@gmail.com>,
<davem@davemloft.net>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>
Subject: Re: [PATCH net-next v2 3/4] dt-bindings: net: Add RGMII internal delay for DP83869
Date: Wed, 20 May 2020 10:30:19 -0500 [thread overview]
Message-ID: <aa31d316-c948-b6c0-9ef4-350566bb019c@ti.com> (raw)
In-Reply-To: <770e42bb-a5d7-fb3e-3fc1-b6f97a9aeb83@ti.com>
Andrew
On 5/20/20 10:28 AM, Dan Murphy wrote:
> Andrew
>
> On 5/20/20 8:56 AM, Andrew Lunn wrote:
>> On Wed, May 20, 2020 at 07:18:34AM -0500, Dan Murphy wrote:
>>> Add the internal delay values into the header and update the binding
>>> with the internal delay properties.
>>>
>>> Signed-off-by: Dan Murphy <dmurphy@ti.com>
>>> ---
>>> .../devicetree/bindings/net/ti,dp83869.yaml | 16 ++++++++++++++++
>>> include/dt-bindings/net/ti-dp83869.h | 18
>>> ++++++++++++++++++
>>> 2 files changed, 34 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/ti,dp83869.yaml
>>> b/Documentation/devicetree/bindings/net/ti,dp83869.yaml
>>> index 5b69ef03bbf7..344015ab9081 100644
>>> --- a/Documentation/devicetree/bindings/net/ti,dp83869.yaml
>>> +++ b/Documentation/devicetree/bindings/net/ti,dp83869.yaml
>>> @@ -64,6 +64,20 @@ properties:
>>> Operational mode for the PHY. If this is not set then the
>>> operational
>>> mode is set by the straps. see dt-bindings/net/ti-dp83869.h
>>> for values
>>> + ti,rx-internal-delay:
>>> + $ref: /schemas/types.yaml#definitions/uint32
>>> + description: |
>>> + RGMII Receive Clock Delay - see dt-bindings/net/ti-dp83869.h
>>> + for applicable values. Required only if interface type is
>>> + PHY_INTERFACE_MODE_RGMII_ID or PHY_INTERFACE_MODE_RGMII_RXID.
>> Hi Dan
>>
>> Having it required with PHY_INTERFACE_MODE_RGMII_ID or
>> PHY_INTERFACE_MODE_RGMII_RXID is pretty unusual. Normally these
>> properties are used to fine tune the delay, if the default of 2ns does
>> not work.
>
> Also if the MAC phy-mode is configured with RGMII-ID and no internal
> delay values defined wouldn't that be counter intuitive?
>
> The driver will error out if the RGMII-ID is used and there was no
> internal delay defined for either rx or tx making either one required.
>
> The MAC node needs to indicate to use the internal delay for RGMII
> other wise the driver should ignore the internal delay programming as
> these internal delays are not applicable to SGMII or MII modes. The
> RGMII mode can be used if the default 2ns delay is acceptable.
>
> Thus why we are documenting in the binding when the internal delay is
> required as putting these under "required" is not correct.
>
> Dan
>
This is also the same for the DP83867 PHY as that PHY and the 83869 have
a few identical features like internal delay, WoL and downshifting.
Dan
>>
>> Andrew
next prev parent reply other threads:[~2020-05-20 15:30 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 12:18 [PATCH net-next v2 0/4] DP83869 Enhancements Dan Murphy
2020-05-20 12:18 ` [PATCH net-next v2 1/4] net: phy: dp83869: Update port-mirroring to read straps Dan Murphy
2020-05-20 12:18 ` [PATCH net-next v2 2/4] net: phy: dp83869: Set opmode from straps Dan Murphy
2020-05-20 15:49 ` Florian Fainelli
2020-05-20 12:18 ` [PATCH net-next v2 3/4] dt-bindings: net: Add RGMII internal delay for DP83869 Dan Murphy
2020-05-20 13:56 ` Andrew Lunn
2020-05-20 15:28 ` Dan Murphy
2020-05-20 15:30 ` Dan Murphy [this message]
2020-05-20 15:36 ` Andrew Lunn
2020-05-20 15:56 ` Dan Murphy
2020-05-20 16:03 ` Florian Fainelli
2020-05-20 16:43 ` Andrew Lunn
2020-05-20 17:20 ` Dan Murphy
2020-05-20 17:45 ` Florian Fainelli
2020-05-20 17:52 ` Dan Murphy
2020-05-20 19:27 ` Andrew Lunn
2020-05-20 20:02 ` Dan Murphy
2020-05-20 20:44 ` Andrew Lunn
2020-05-20 20:55 ` Dan Murphy
2020-05-20 12:18 ` [PATCH net-next v2 4/4] net: dp83869: Add RGMII internal delay configuration Dan Murphy
2020-05-22 12:25 [PATCH net-next v2 0/4] RGMII Internal delay common property Dan Murphy
2020-05-22 12:25 ` [PATCH net-next v2 3/4] dt-bindings: net: Add RGMII internal delay for DP83869 Dan Murphy
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