From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Walleij Subject: [PATCH 2/3] net: smsc911x: request and deassert optional RESET GPIO Date: Fri, 8 Jul 2016 11:07:31 +0200 Message-ID: <1467968852-6175-2-git-send-email-linus.walleij@linaro.org> References: <1467968852-6175-1-git-send-email-linus.walleij@linaro.org> Cc: Guenter Roeck , Jeremy Linton , Kamlakant Patel , Pavel Fedin , Linus Walleij To: netdev@vger.kernel.org, "David S . Miller" , Steve Glendinning Return-path: Received: from mail-lf0-f41.google.com ([209.85.215.41]:33006 "EHLO mail-lf0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753955AbcGHJHo (ORCPT ); Fri, 8 Jul 2016 05:07:44 -0400 Received: by mail-lf0-f41.google.com with SMTP id f6so26064194lfg.0 for ; Fri, 08 Jul 2016 02:07:43 -0700 (PDT) In-Reply-To: <1467968852-6175-1-git-send-email-linus.walleij@linaro.org> Sender: netdev-owner@vger.kernel.org List-ID: On some systems (such as the Qualcomm APQ8060 Dragonboard) the RESET signal of the SMSC911x is not pulled up by a resistor but connected to a GPIO line, so that the operating system must explicitly deassert RESET before use. Support this in the SMSC911x driver so this ethernet connector can be used on such targets. Signed-off-by: Linus Walleij --- drivers/net/ethernet/smsc/smsc911x.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c index 8af25563f627..125d58ac22bd 100644 --- a/drivers/net/ethernet/smsc/smsc911x.c +++ b/drivers/net/ethernet/smsc/smsc911x.c @@ -62,6 +62,7 @@ #include #include #include +#include #include "smsc911x.h" @@ -149,6 +150,9 @@ struct smsc911x_data { /* regulators */ struct regulator_bulk_data supplies[SMSC911X_NUM_SUPPLIES]; + /* Reset GPIO */ + struct gpio_desc *reset_gpiod; + /* clock */ struct clk *clk; }; @@ -440,6 +444,15 @@ static int smsc911x_request_resources(struct platform_device *pdev) netdev_err(ndev, "couldn't get regulators %d\n", ret); + /* Request optional RESET GPIO */ + pdata->reset_gpiod = devm_gpiod_get(&pdev->dev, "reset", + GPIOD_OUT_HIGH); + /* Deassert the signal */ + if (!IS_ERR(pdata->reset_gpiod)) { + dev_info(&pdev->dev, "release reset\n"); + gpiod_set_value(pdata->reset_gpiod, 0); + } + /* Request clock */ pdata->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(pdata->clk)) -- 2.7.4