From patchwork Sat Mar 13 08:04:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?UWlpIFdhbmcgKOeOi+eQqik=?= X-Patchwork-Id: 12136599 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=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, 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 D5026C433E0 for ; Sat, 13 Mar 2021 08:06:43 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 592E464F1E for ; Sat, 13 Mar 2021 08:06:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 592E464F1E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=an1JHmy2CjuJolOFe03PJhD7jDWyh61A/xwxSHJAqjM=; b=SMHZXOhW1XcZSWivr+hG0yfeuq KF3YrGYoyCmRbXNUA8kTraDDP02ILE/MBh7Qs3kOYlUIKVJOApUovaYrP2ILgybWmWeb004SY0/zx QHUA2qCJO8J4vC60fd3wNt75PUbAUgmyqxZi0fLpRIrDmeApE5+9iLChkRD9zXujvBuWjPtfVKPv5 CbG7oDa4bwAK4skll0VDziI147N64dQRbFqhj9L07ePq8vyXNi6/tXzHHxX+nHCVp5AqJwlCnN+0Y Wzo+X9ywoOipZSMbyDbYcMG7sGkyHlbYsz2tIiu63EQ3QJ59Qwf3MIdYUrtddXZL5vyAeV1d47Fny 1iudra8w==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lKzHs-00CzZq-Pr; Sat, 13 Mar 2021 08:06:18 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lKzGM-00CzUz-Tk; Sat, 13 Mar 2021 08:05:30 +0000 X-UUID: 5b44a84b34264d8b9bc6e1ac308f7831-20210313 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=rJr+m/kmIzVPILQqif4baN3fSWnSDOj1UIMjYFwaVPI=; b=PZbzrKDfMYnJHR3Ny3qdEHYr5py7Y42falQazZb2A2SoZtYTp3UA2MVlY6VsIjiTLzQCgFIf8p8sFhx2FboYitdyT3JK+SfF9ayUshoePRsc63IY2Cwm/7+9jWeHTywPRFexXVnVJo2Ei3YbEZASJz76MqO2+/OWtC/zb7+9A7w=; X-UUID: 5b44a84b34264d8b9bc6e1ac308f7831-20210313 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 74472561; Sat, 13 Mar 2021 00:04:32 -0800 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sat, 13 Mar 2021 00:04:30 -0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sat, 13 Mar 2021 16:04:28 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Sat, 13 Mar 2021 16:04:28 +0800 From: To: CC: , , , , , , , Subject: [RESEND] i2c: mediatek: Get device clock-stretch time via dts Date: Sat, 13 Mar 2021 16:04:24 +0800 Message-ID: <1615622664-15032-1-git-send-email-qii.wang@mediatek.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210313_080511_499550_B6178F06 X-CRM114-Status: GOOD ( 12.02 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org From: Qii Wang tSU,STA/tHD,STA/tSU,STOP maybe out of spec due to device clock-stretching or circuit loss, we could get device clock-stretch time from dts to adjust these parameters to meet the spec via EXT_CONF register. Signed-off-by: Qii Wang --- drivers/i2c/busses/i2c-mt65xx.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 2ffd2f3..47c7255 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -245,6 +245,7 @@ struct mtk_i2c { u16 irq_stat; /* interrupt status */ unsigned int clk_src_div; unsigned int speed_hz; /* The speed in transfer */ + unsigned int clock_stretch_ns; enum mtk_trans_op op; u16 timing_reg; u16 high_speed_reg; @@ -607,7 +608,8 @@ static int mtk_i2c_check_ac_timing(struct mtk_i2c *i2c, else clk_ns = sample_ns / 2; - su_sta_cnt = DIV_ROUND_UP(spec->min_su_sta_ns, clk_ns); + su_sta_cnt = DIV_ROUND_UP(spec->min_su_sta_ns + i2c->clock_stretch_ns, + clk_ns); if (su_sta_cnt > max_sta_cnt) return -1; @@ -1171,6 +1173,8 @@ static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c) if (i2c->clk_src_div == 0) return -EINVAL; + of_property_read_u32(np, "clock-stretch-ns", &i2c->clock_stretch_ns); + i2c->have_pmic = of_property_read_bool(np, "mediatek,have-pmic"); i2c->use_push_pull = of_property_read_bool(np, "mediatek,use-push-pull");