From patchwork Tue Feb 7 06:13:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?Q2h1bmZlbmcgWXVuICjkupHmmKXls7Ap?= X-Patchwork-Id: 9559251 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0A85C60434 for ; Tue, 7 Feb 2017 06:14:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EFF05269A3 for ; Tue, 7 Feb 2017 06:14:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E49AE27CEA; Tue, 7 Feb 2017 06:14:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 822F7269A3 for ; Tue, 7 Feb 2017 06:14:45 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1caz36-00063h-Om; Tue, 07 Feb 2017 06:14:44 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1caz32-0005cv-QI; Tue, 07 Feb 2017 06:14:42 +0000 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 994870523; Tue, 07 Feb 2017 14:14:16 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Tue, 7 Feb 2017 14:13:36 +0800 From: Chunfeng Yun To: Mathias Nyman , Felipe Balbi Subject: [PATCH -next 2/3] usb: mtu3: make the reference clock optional Date: Tue, 7 Feb 2017 14:13:32 +0800 Message-ID: <1486448013-8784-2-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1486448013-8784-1-git-send-email-chunfeng.yun@mediatek.com> References: <1486448013-8784-1-git-send-email-chunfeng.yun@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170206_221440_998811_58C39BB8 X-CRM114-Status: GOOD ( 14.08 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Ian Campbell , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Chunfeng Yun , Rob Herring , linux-mediatek@lists.infradead.org, Matthias Brugger , linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Make the reference clock optional for DTS backward compatibility and ignore the error if it does not exist. Signed-off-by: Chunfeng Yun --- drivers/usb/mtu3/mtu3_plat.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c index 19a345d..c3125da 100644 --- a/drivers/usb/mtu3/mtu3_plat.c +++ b/drivers/usb/mtu3/mtu3_plat.c @@ -225,10 +225,17 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb) return PTR_ERR(ssusb->sys_clk); } + /* + * reference clock is usually a "fixed-clock", make it optional + * for backward compatibility and ignore the error if it does + * not exist. + */ ssusb->ref_clk = devm_clk_get(dev, "ref_ck"); if (IS_ERR(ssusb->ref_clk)) { - dev_err(dev, "failed to get ref clock\n"); - return PTR_ERR(ssusb->ref_clk); + if (PTR_ERR(ssusb->ref_clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + ssusb->ref_clk = NULL; } ssusb->num_phys = of_count_phandle_with_args(node,