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[62.107.28.193]) by smtp.googlemail.com with ESMTPSA id z6sm11326993wml.41.2020.07.30.12.58.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jul 2020 12:58:18 -0700 (PDT) From: Bruno Thomsen To: netdev Cc: Bruno Thomsen , Andrew Lunn , Fabio Estevam , Florian Fainelli , Russell King - ARM Linux , Heiner Kallweit , Lars Alex Pedersen , Bruno Thomsen Subject: [PATCH v2 3/4 net-next] net: mdiobus: add reset-post-delay-us handling Date: Thu, 30 Jul 2020 21:57:48 +0200 Message-Id: <20200730195749.4922-4-bruno.thomsen@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200730195749.4922-1-bruno.thomsen@gmail.com> References: <20200730195749.4922-1-bruno.thomsen@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Load new "reset-post-delay-us" value from MDIO properties, and if configured to a greater then zero delay do a flexible sleeping delay after MDIO bus reset deassert. This allows devices to exit reset state before start bus communication. Signed-off-by: Bruno Thomsen --- drivers/net/phy/mdio_bus.c | 2 ++ drivers/of/of_mdio.c | 2 ++ include/linux/phy.h | 2 ++ 3 files changed, 6 insertions(+) diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index 5df3782b05b4..0af20faad69d 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -556,6 +556,8 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner) gpiod_set_value_cansleep(gpiod, 1); fsleep(bus->reset_delay_us); gpiod_set_value_cansleep(gpiod, 0); + if (bus->reset_post_delay_us > 0) + fsleep(bus->reset_post_delay_us); } if (bus->reset) { diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index eb84507de28a..cb32d7ef4938 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -268,6 +268,8 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) /* Get bus level PHY reset GPIO details */ mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY; of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us); + mdio->reset_post_delay_us = 0; + of_property_read_u32(np, "reset-post-delay-us", &mdio->reset_post_delay_us); /* Register the MDIO bus */ rc = mdiobus_register(mdio); diff --git a/include/linux/phy.h b/include/linux/phy.h index 0403eb799913..3a09d2bf69ea 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -293,6 +293,8 @@ struct mii_bus { /* GPIO reset pulse width in microseconds */ int reset_delay_us; + /* GPIO reset deassert delay in microseconds */ + int reset_post_delay_us; /* RESET GPIO descriptor pointer */ struct gpio_desc *reset_gpiod; -- 2.26.2