lkml.org 
[lkml]   [2020]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v4 1/4] dt-bindings: net: phy: Add support for NXP TJA11xx
From
Date


On 3/13/2020 11:16 AM, Oleksij Rempel wrote:
> On Fri, Mar 13, 2020 at 07:10:56PM +0100, Andrew Lunn wrote:
>>>> diff --git a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
>>>> new file mode 100644
>>>> index 000000000000..42be0255512b
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
>>>> @@ -0,0 +1,61 @@
>>>> +# SPDX-License-Identifier: GPL-2.0+
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/net/nxp,tja11xx.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: NXP TJA11xx PHY
>>>> +
>>>> +maintainers:
>>>> + - Andrew Lunn <andrew@lunn.ch>
>>>> + - Florian Fainelli <f.fainelli@gmail.com>
>>>> + - Heiner Kallweit <hkallweit1@gmail.com>
>>>> +
>>>> +description:
>>>> + Bindings for NXP TJA11xx automotive PHYs
>>>> +
>>>> +allOf:
>>>> + - $ref: ethernet-phy.yaml#
>>>> +
>>>> +patternProperties:
>>>> + "^ethernet-phy@[0-9a-f]+$":
>>>> + type: object
>>>> + description: |
>>>> + Some packages have multiple PHYs. Secondary PHY should be defines as
>>>> + subnode of the first (parent) PHY.
>>>
>>>
>>> There are QSGMII PHYs which have 4 PHYs embedded and AFAICT they are
>>> defined as 4 separate Ethernet PHY nodes and this would not be quite a
>>> big stretch to represent them that way compared to how they are.
>>>
>>> I would recommend doing the same thing and not bend the MDIO framework
>>> to support the registration of "nested" Ethernet PHY nodes.
>>
>> Hi Florian
>>
>> The issue here is the missing PHY ID in the secondary PHY. Because of
>> that, the secondary does not probe in the normal way. We need the
>> primary to be involved to some degree. It needs to register it. What
>> i'm not so clear on is if it just needs to register it, or if these
>> sub nodes are actually needed, given the current code.
>
> There are a bit more dependencies:
> - PHY0 is responsible for health monitoring. If some thing wrong, it may
> shut down complete chip.
> - We have shared reset. It make no sense to probe PHY1 before PHY0 with
> more controlling options will be probed
> - It is possible bat dangerous to use PHY1 without PHY0.

probing is a software problem though. If we want to describe the PHY
package more correctly, we should be using a container node, something
like this maybe:

phy-package {
compatible = "nxp,tja1102";

ethernet-phy@4 {
reg = <4>;
};

ethernet-phy@5 {
reg = <5>;
};
};
--
Florian

\
 
 \ /
  Last update: 2020-03-13 19:21    [W:0.053 / U:0.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site