linux-kernel - Re: [PATCH v2 2/4] phy: Add ethernet serdes configuration option

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Message-ID: <20201119144359.y5scnscmb7nvptnv@mchp-dev-shegelun>
Date:   Thu, 19 Nov 2020 15:43:59 +0100
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Microsemi List <microsemi@...ts.bootlin.com>,
        Microchip UNG Driver List <UNGLinuxDriver@...rochip.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] phy: Add ethernet serdes configuration option

On 19.11.2020 11:37, Vinod Koul wrote:
>EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
>On 10-11-20, 15:49, Steen Hegelund wrote:
>> Provide a new ethernet phy configuration structure, that
>> allow PHYs used for ethernet to be configured with
>> speed, media type and clock information.
>>
>> Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
>> Signed-off-by: Steen Hegelund <steen.hegelund@...rochip.com>
>> ---
>>  include/linux/phy/phy-ethernet-serdes.h | 49 +++++++++++++++++++++++++
>>  include/linux/phy/phy.h                 |  4 ++
>>  2 files changed, 53 insertions(+)
>>  create mode 100644 include/linux/phy/phy-ethernet-serdes.h
>>
>> diff --git a/include/linux/phy/phy-ethernet-serdes.h b/include/linux/phy/phy-ethernet-serdes.h
>> new file mode 100644
>> index 000000000000..04f496855b00
>> --- /dev/null
>> +++ b/include/linux/phy/phy-ethernet-serdes.h
>> @@ -0,0 +1,49 @@
>> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
>> +/*
>> + * Microchip Sparx5 Ethernet SerDes driver
>> + *
>> + * Copyright (c) 2020 Microschip Inc
>> + */
>> +#ifndef __PHY_ETHERNET_SERDES_H_
>> +#define __PHY_ETHERNET_SERDES_H_
>> +
>> +#include <linux/phy.h>
>> +
>> +enum ethernet_media_type {
>> +     ETH_MEDIA_DEFAULT,
>> +     ETH_MEDIA_SR,
>> +     ETH_MEDIA_DAC,
>> +};
>> +
>> +/**
>> + * struct phy_configure_opts_eth_serdes - Ethernet SerDes
>> + *
>> + * This structure is used to represent the configuration state of a
>> + * Ethernet Serdes PHY.
>> + */
>> +struct phy_configure_opts_eth_serdes {
>> +     /**
>> +      * @speed
>> +      *
>> +      * Speed of the serdes interface in Mbps
>> +      */
>
>Can we have this in kernel-doc style pls
>
I will update the documentation.
>> +     u32                        speed;
>> +
>> +     /**
>> +      * @media_type
>> +      *
>> +      * Specifies which media the serdes will be using
>> +      */
>> +     enum ethernet_media_type   media_type;
>> +
>> +     /**
>> +      * @clk
>> +      *
>> +      * Specifies the serdes clock in MHz
>> +      * Default: 0 will provide the highest supported clock.
>> +      */
>> +     u32                        clk;
>
>Why not use std clk interface for this..?

I am not familiar with that.  Is that the max_link_rate in struct phy_attrs?

>
>> +};
>> +
>> +#endif
>> +
>> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
>> index e435bdb0bab3..78ecb375cede 100644
>> --- a/include/linux/phy/phy.h
>> +++ b/include/linux/phy/phy.h
>> @@ -18,6 +18,7 @@
>>
>>  #include <linux/phy/phy-dp.h>
>>  #include <linux/phy/phy-mipi-dphy.h>
>> +#include <linux/phy/phy-ethernet-serdes.h>
>>
>>  struct phy;
>>
>> @@ -49,11 +50,14 @@ enum phy_mode {
>>   *
>>   * @mipi_dphy:       Configuration set applicable for phys supporting
>>   *           the MIPI_DPHY phy mode.
>> + * @eth_serdes: Configuration set applicable for phys supporting
>> + *           the ethernet serdes.
>>   * @dp:              Configuration set applicable for phys supporting
>>   *           the DisplayPort protocol.
>>   */
>>  union phy_configure_opts {
>>       struct phy_configure_opts_mipi_dphy     mipi_dphy;
>> +     struct phy_configure_opts_eth_serdes    eth_serdes;
>
>Kishon, does this look okay for you..?
>
>>       struct phy_configure_opts_dp            dp;
>>  };
>>
>> --
>> 2.29.2
>
>--
>~Vinod

BR
Steen

---------------------------------------
Steen Hegelund
steen.hegelund@...rochip.com