netdev - [PATCH 12/12] net: phy: add default gpio assert/deassert delay

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Message-Id: <20230405-net-next-topic-net-phy-reset-v1-12-7e5329f08002@pengutronix.de>
Date:   Wed, 05 Apr 2023 11:27:03 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>,
        Radu Pirea <radu-nicolae.pirea@....nxp.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Iyappan Subramanian <iyappan@...amperecomputing.com>,
        Keyur Chudgar <keyur@...amperecomputing.com>,
        Quan Nguyen <quan@...amperecomputing.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, devicetree@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH 12/12] net: phy: add default gpio assert/deassert delay

There are phy's not mention any assert/deassert delay within their
datasheets but the real world showed that this is not true. They need at
least a few us to be accessible and to readout the register values. So
add a sane default value of 1000us for both assert and deassert to fix
this in a global matter.

Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
 drivers/net/phy/phy_device.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 30b3ac9818b1..08f2657110e0 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3197,6 +3197,9 @@ fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
 	return register_mii_timestamper(arg.np, arg.args[0]);
 }
 
+#define DEFAULT_GPIO_RESET_ASSERT_DELAY_US	1000
+#define DEFAULT_GPIO_RESET_DEASSERT_DELAY_US	1000
+
 static int
 phy_device_parse_fwnode(struct phy_device *phydev,
 			struct phy_device_config *config)
@@ -3223,8 +3226,11 @@ phy_device_parse_fwnode(struct phy_device *phydev,
 
 	if (fwnode_property_read_bool(fwnode, "broken-turn-around"))
 		bus->phy_ignore_ta_mask |= 1 << addr;
+
+	phydev->mdio.reset_assert_delay = DEFAULT_GPIO_RESET_ASSERT_DELAY_US;
 	fwnode_property_read_u32(fwnode, "reset-assert-us",
 				 &phydev->mdio.reset_assert_delay);
+	phydev->mdio.reset_deassert_delay = DEFAULT_GPIO_RESET_DEASSERT_DELAY_US;
 	fwnode_property_read_u32(fwnode, "reset-deassert-us",
 				 &phydev->mdio.reset_deassert_delay);
 

-- 
2.39.2