From patchwork Wed Oct 3 12:49:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baruch Siach X-Patchwork-Id: 978285 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=tkos.co.il Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42QG9f3NwVz9sRp for ; Wed, 3 Oct 2018 22:51:34 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726691AbeJCTjs (ORCPT ); Wed, 3 Oct 2018 15:39:48 -0400 Received: from guitar.tcltek.co.il ([192.115.133.116]:44156 "EHLO mx.tkos.co.il" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726619AbeJCTjs (ORCPT ); Wed, 3 Oct 2018 15:39:48 -0400 Received: from sapphire.tkos.co.il (unknown [10.0.4.3]) by mx.tkos.co.il (Postfix) with ESMTP id E714044011A; Wed, 3 Oct 2018 15:51:29 +0300 (IDT) From: Baruch Siach To: Thomas Petazzoni Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Lorenzo Pieralisi , Bjorn Helgaas , Baruch Siach Subject: [PATCH] PCI: armada8k: add support for gpio controlled reset signal Date: Wed, 3 Oct 2018 15:49:43 +0300 Message-Id: <405efb21a4600efad10413fcf4c72aacce180125.1538570983.git.baruch@tkos.co.il> X-Mailer: git-send-email 2.19.0 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This commit adds support for the gpio reset signal binding as described in the designware-pcie.txt DT binding document. Both the documented 'reset-gpio' property name, and the more standard 'reset-gpios' name are supported. Signed-off-by: Baruch Siach Acked-by: Thomas Petazzoni --- drivers/pci/controller/dwc/pcie-armada8k.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c index 0c389a30ef5d..b171b6bc15c8 100644 --- a/drivers/pci/controller/dwc/pcie-armada8k.c +++ b/drivers/pci/controller/dwc/pcie-armada8k.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "pcie-designware.h" @@ -29,6 +30,7 @@ struct armada8k_pcie { struct dw_pcie *pci; struct clk *clk; struct clk *clk_reg; + struct gpio_desc *reset_gpio; }; #define PCIE_VENDOR_REGS_OFFSET 0x8000 @@ -137,6 +139,12 @@ static int armada8k_pcie_host_init(struct pcie_port *pp) struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct armada8k_pcie *pcie = to_armada8k_pcie(pci); + if (pcie->reset_gpio) { + /* assert and then deassert the reset signal */ + gpiod_set_value_cansleep(pcie->reset_gpio, 1); + msleep(100); + gpiod_set_value_cansleep(pcie->reset_gpio, 0); + } dw_pcie_setup_rc(pp); armada8k_pcie_establish_link(pcie); @@ -249,6 +257,14 @@ static int armada8k_pcie_probe(struct platform_device *pdev) goto fail_clkreg; } + /* Get reset gpio signal and hold asserted (logically high) */ + pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(pcie->reset_gpio)) { + ret = PTR_ERR(pcie->reset_gpio); + goto fail_clkreg; + } + platform_set_drvdata(pdev, pcie); ret = armada8k_add_pcie_port(pcie, pdev);