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Date: Thu, 3 Nov 2022 17:06:44 -0400
From: Sean Anderson <sean.anderson@...o.com>
To: Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org
Cc: Vladimir Oltean <olteanv@...il.com>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
Andrew Lunn <andrew@...n.ch>,
Ioana Ciornei <ioana.ciornei@....com>,
Madalin Bucur <madalin.bucur@....com>,
"David S . Miller" <davem@...emloft.net>,
Sean Anderson <sean.anderson@...o.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Claudiu Manoil <claudiu.manoil@....com>,
Florian Fainelli <f.fainelli@...il.com>,
UNGLinuxDriver@...rochip.com,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net-next v2 05/11] net: pcs: lynx: Convert to an MDIO driver
This partially converts the lynx PCS driver to a proper MDIO driver.
This allows using a more conventional driver lifecycle (e.g. with a
probe and remove). For compatibility with existing drivers, we retain
the old lynx_pcs_create/destroy functions. This may result in two
"drivers" attached to the same device (one real driver, and one attached
with lynx_pcs_create). However, this should not cause problems because
consumers will only use one or the other.
To assist in conversion of existing drivers to the PCS API, we provide a
lynx_pcs_create_on_bus function which will create an MDIO device on a
bus, bind our driver, and get the PCS. This should make it easy to
convert drivers which do not use devicetree.
Because this driver may be a direct child of its consumers (especially
when created with lynx_pcs_create_on_bus), we set suppress_bind_attrs.
This prevents userspace from causing a segfault by removing the PCS
before the consumer.
Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---
Changes in v2:
- Call mdio_device_register
- Squash in lynx parts of "use pcs_get_by_provider to get PCS"
- Rewrite probe/remove functions to use create/destroy. This lets us
convert existing drivers one at a time, instead of needing a flag day.
drivers/net/pcs/Kconfig | 11 +++--
drivers/net/pcs/pcs-lynx.c | 83 +++++++++++++++++++++++++++++++++++---
include/linux/pcs-lynx.h | 7 +++-
3 files changed, 91 insertions(+), 10 deletions(-)
diff --git a/drivers/net/pcs/Kconfig b/drivers/net/pcs/Kconfig
index 8d70fc52a803..5e169e87db74 100644
--- a/drivers/net/pcs/Kconfig
+++ b/drivers/net/pcs/Kconfig
@@ -25,10 +25,15 @@ config PCS_XPCS
controllers.
config PCS_LYNX
- tristate
+ tristate "NXP Lynx PCS driver"
+ depends on PCS && MDIO_DEVICE
help
- This module provides helpers to phylink for managing the Lynx PCS
- which is part of the Layerscape and QorIQ Ethernet SERDES.
+ This module provides driver support for the PCSs in Lynx 10g and 28g
+ SerDes devices. These devices are present in NXP QorIQ SoCs,
+ including the Layerscape series.
+
+ If you want to use Ethernet on a QorIQ SoC, say "Y". If compiled as a
+ module, it will be called "pcs-lynx".
config PCS_RZN1_MIIC
tristate "Renesas RZ/N1 MII converter"
diff --git a/drivers/net/pcs/pcs-lynx.c b/drivers/net/pcs/pcs-lynx.c
index 7d5fc7f54b2f..3ea402049ef1 100644
--- a/drivers/net/pcs/pcs-lynx.c
+++ b/drivers/net/pcs/pcs-lynx.c
@@ -1,11 +1,14 @@
-// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
-/* Copyright 2020 NXP
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (C) 2022 Sean Anderson <seanga2@...il.com>
+ * Copyright 2020 NXP
* Lynx PCS MDIO helpers
*/
#include <linux/mdio.h>
-#include <linux/phylink.h>
+#include <linux/of.h>
+#include <linux/pcs.h>
#include <linux/pcs-lynx.h>
+#include <linux/phylink.h>
#define SGMII_CLOCK_PERIOD_NS 8 /* PCS is clocked at 125 MHz */
#define LINK_TIMER_VAL(ns) ((u32)((ns) / SGMII_CLOCK_PERIOD_NS))
@@ -333,7 +336,26 @@ struct phylink_pcs *lynx_pcs_create(struct mdio_device *mdio)
return lynx_to_phylink_pcs(lynx);
}
-EXPORT_SYMBOL(lynx_pcs_create);
+EXPORT_SYMBOL_GPL(lynx_pcs_create);
+
+static int lynx_pcs_probe(struct mdio_device *mdio)
+{
+ struct device *dev = &mdio->dev;
+ struct phylink_pcs *pcs;
+ int ret;
+
+ pcs = lynx_pcs_create(mdio);
+ if (!pcs)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, pcs);
+ pcs->dev = dev;
+ ret = pcs_register(pcs);
+ if (ret)
+ return dev_err_probe(dev, ret, "could not register PCS\n");
+ dev_info(dev, "probed\n");
+ return 0;
+}
void lynx_pcs_destroy(struct phylink_pcs *pcs)
{
@@ -343,4 +365,55 @@ void lynx_pcs_destroy(struct phylink_pcs *pcs)
}
EXPORT_SYMBOL(lynx_pcs_destroy);
-MODULE_LICENSE("Dual BSD/GPL");
+static void lynx_pcs_remove(struct mdio_device *mdio)
+{
+ struct phylink_pcs *pcs = dev_get_drvdata(&mdio->dev);
+
+ pcs_unregister(pcs);
+ lynx_pcs_destroy(pcs);
+}
+
+static const struct of_device_id lynx_pcs_of_match[] = {
+ { .compatible = "fsl,lynx-pcs" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, lynx_pcs_of_match);
+
+static struct mdio_driver lynx_pcs_driver = {
+ .probe = lynx_pcs_probe,
+ .remove = lynx_pcs_remove,
+ .mdiodrv.driver = {
+ .name = "lynx-pcs",
+ .of_match_table = of_match_ptr(lynx_pcs_of_match),
+ .suppress_bind_attrs = true,
+ },
+};
+mdio_module_driver(lynx_pcs_driver);
+
+struct phylink_pcs *lynx_pcs_create_on_bus(struct device *dev,
+ struct mii_bus *bus, int addr)
+{
+ struct mdio_device *mdio;
+ struct phylink_pcs *pcs;
+ int err;
+
+ mdio = mdio_device_create(bus, addr);
+ if (IS_ERR(mdio))
+ return ERR_CAST(mdio);
+
+ mdio->bus_match = mdio_device_bus_match;
+ strncpy(mdio->modalias, "lynx-pcs", sizeof(mdio->modalias));
+ err = mdio_device_register(mdio);
+ if (err) {
+ mdio_device_free(mdio);
+ return ERR_PTR(err);
+ }
+
+ pcs = pcs_get_by_dev(dev, &mdio->dev);
+ mdio_device_free(mdio);
+ return pcs;
+}
+EXPORT_SYMBOL(lynx_pcs_create_on_bus);
+
+MODULE_DESCRIPTION("NXP Lynx 10G/28G PCS driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/pcs-lynx.h b/include/linux/pcs-lynx.h
index 5712cc2ce775..ef073b28fae9 100644
--- a/include/linux/pcs-lynx.h
+++ b/include/linux/pcs-lynx.h
@@ -6,12 +6,15 @@
#ifndef __LINUX_PCS_LYNX_H
#define __LINUX_PCS_LYNX_H
-#include <linux/mdio.h>
-#include <linux/phylink.h>
+struct device;
+struct mii_bus;
+struct phylink_pcs;
struct mdio_device *lynx_get_mdio_device(struct phylink_pcs *pcs);
struct phylink_pcs *lynx_pcs_create(struct mdio_device *mdio);
+struct phylink_pcs *lynx_pcs_create_on_bus(struct device *dev,
+ struct mii_bus *bus, int addr);
void lynx_pcs_destroy(struct phylink_pcs *pcs);
--
2.35.1.1320.gc452695387.dirty
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