From patchwork Mon May 10 14:15:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Stach X-Patchwork-Id: 12248401 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54481C43611 for ; Mon, 10 May 2021 14:55:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2926A61601 for ; Mon, 10 May 2021 14:55:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241912AbhEJO4P (ORCPT ); Mon, 10 May 2021 10:56:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40454 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240341AbhEJOz1 (ORCPT ); Mon, 10 May 2021 10:55:27 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E60AAC046859 for ; Mon, 10 May 2021 07:15:17 -0700 (PDT) Received: from dude03.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::39]) by metis.ext.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lg6gh-0000Fk-Ky; Mon, 10 May 2021 16:15:11 +0200 From: Lucas Stach To: Bjorn Helgaas , Lorenzo Pieralisi , Rob Herring , Richard Zhu Cc: NXP Linux Team , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, kernel@pengutronix.de, patchwork-lst@pengutronix.de Subject: [PATCH 4/7] dt-bindings: imx6q-pcie: add a property configure refclk pad usage mode Date: Mon, 10 May 2021 16:15:06 +0200 Message-Id: <20210510141509.929120-4-l.stach@pengutronix.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210510141509.929120-1-l.stach@pengutronix.de> References: <20210510141509.929120-1-l.stach@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:1101:1d::39 X-SA-Exim-Mail-From: l.stach@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-pci@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Starting with the i.MX7, arch PCIe instance has a differential refclk pad, which can beused in multiple ways: - It's not used at all and the PHY reference clock is provided by a SoC internal source, like on the previous SOCs. - It's used as a clock input, for the board to provide a reference clock for the PHY. - It's used as a clock output, where the PHY reference clock is provided by a SoC internal source and the same clock is also routed to the refclk pad for consumption of board-level components. Signed-off-by: Lucas Stach --- Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt index 308540df99ef..3ebd8553a818 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt @@ -38,6 +38,11 @@ Optional properties: The regulator will be enabled when initializing the PCIe host and disabled either as part of the init process or when shutting down the host. +- fsl,refclk-pad-mode: Usage mode of the refclk pad. Valid values: + - 0: pad not used. PHY refclock is derived from SoC internal source. + - 1: pad input. PHY refclock is provided externally via the refclk pad. + - 2: pad output. PHY refclock is derived from SoC internal source and + provided on the refclk pad. Additional required properties for imx6sx-pcie: - clock names: Must include the following additional entries: