Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752883AbdLKMRf (ORCPT ); Mon, 11 Dec 2017 07:17:35 -0500 Received: from relay03.alfahosting-server.de ([109.237.142.239]:27424 "EHLO relay03.alfahosting-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751400AbdLKMR0 (ORCPT ); Mon, 11 Dec 2017 07:17:26 -0500 X-Spam-DCC: : From: Richard Leitner To: robh+dt@kernel.org, mark.rutland@arm.com, fugang.duan@nxp.com, andrew@lunn.ch, f.fainelli@gmail.com, frowand.list@gmail.com Cc: davem@davemloft.net, geert+renesas@glider.be, sergei.shtylyov@cogentembedded.com, baruch@tkos.co.il, david.wu@rock-chips.com, lukma@denx.de, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, richard.leitner@skidata.com Subject: [PATCH net-next v5 1/4] phylib: Add device reset delay support Date: Mon, 11 Dec 2017 13:16:57 +0100 Message-Id: <20171211121700.10200-2-dev@g0hl1n.net> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171211121700.10200-1-dev@g0hl1n.net> References: <20171211121700.10200-1-dev@g0hl1n.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3412 Lines: 103 From: Richard Leitner Some PHYs need a minimum time after the reset gpio was asserted and/or deasserted. To ensure we meet these timing requirements add two new optional devicetree parameters for the phy: reset-delay-us and reset-post-delay-us. Signed-off-by: Richard Leitner Reviewed-by: Geert Uytterhoeven --- Documentation/devicetree/bindings/net/phy.txt | 10 ++++++++++ drivers/net/phy/mdio_device.c | 13 +++++++++++-- drivers/of/of_mdio.c | 4 ++++ include/linux/mdio.h | 2 ++ 4 files changed, 27 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt index c05479f5ac7c..72860ce7f610 100644 --- a/Documentation/devicetree/bindings/net/phy.txt +++ b/Documentation/devicetree/bindings/net/phy.txt @@ -55,6 +55,12 @@ Optional Properties: - reset-gpios: The GPIO phandle and specifier for the PHY reset signal. +- reset-delay-us: Delay after the reset was asserted in microseconds. + If this property is missing the delay will be skipped. + +- reset-post-delay-us: Delay after the reset was deasserted in microseconds. + If this property is missing the delay will be skipped. + Example: ethernet-phy@0 { @@ -62,4 +68,8 @@ ethernet-phy@0 { interrupt-parent = <&PIC>; interrupts = <35 IRQ_TYPE_EDGE_RISING>; reg = <0>; + + reset-gpios = <&gpio1 4 GPIO_ACTIVE_LOW>; + reset-delay-us = <1000>; + reset-post-delay-us = <2000>; }; diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c index 75d97dd9fb28..843c1dde93e4 100644 --- a/drivers/net/phy/mdio_device.c +++ b/drivers/net/phy/mdio_device.c @@ -24,6 +24,7 @@ #include #include #include +#include void mdio_device_free(struct mdio_device *mdiodev) { @@ -118,8 +119,16 @@ EXPORT_SYMBOL(mdio_device_remove); void mdio_device_reset(struct mdio_device *mdiodev, int value) { - if (mdiodev->reset) - gpiod_set_value(mdiodev->reset, value); + unsigned int d; + + if (!mdiodev->reset) + return; + + gpiod_set_value(mdiodev->reset, value); + + d = value ? mdiodev->reset_delay : mdiodev->reset_post_delay; + if (d) + usleep_range(d, d + max_t(unsigned int, d / 10, 100)); } EXPORT_SYMBOL(mdio_device_reset); diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index 98258583abb0..7c8767176315 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -77,6 +77,10 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, if (of_property_read_bool(child, "broken-turn-around")) mdio->phy_ignore_ta_mask |= 1 << addr; + of_property_read_u32(child, "reset-delay-us", &phy->mdio.reset_delay); + of_property_read_u32(child, "reset-post-delay-us", + &phy->mdio.reset_post_delay); + /* Associate the OF node with the device structure so it * can be looked up later */ of_node_get(child); diff --git a/include/linux/mdio.h b/include/linux/mdio.h index 92d4e55ffe67..e37c21d8eb19 100644 --- a/include/linux/mdio.h +++ b/include/linux/mdio.h @@ -41,6 +41,8 @@ struct mdio_device { int addr; int flags; struct gpio_desc *reset; + unsigned int reset_delay; + unsigned int reset_post_delay; }; #define to_mdio_device(d) container_of(d, struct mdio_device, dev) -- 2.11.0