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

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Message-ID: <20201119155916.ies46qesbp7e32gk@mchp-dev-shegelun>
Date:   Thu, 19 Nov 2020 16:59:16 +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 15:43, Steen Hegelund wrote:
>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?

Now I get it: A DT clock node referred by the SerDes: Yes that should be
possible.  I will try that out...

>
>>
>>>+};
>>>+
>>>+#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

BR
Steen

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