From patchwork Thu Jan 14 03:14:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Jeffery X-Patchwork-Id: 12018561 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,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 007C7C433E0 for ; Thu, 14 Jan 2021 03:16:48 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 9268923619 for ; Thu, 14 Jan 2021 03:16:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9268923619 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=aj.id.au Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=j0vR1CbJFIu13kuHofC4kIolzaQuhNJ/KUoZ3pM8H5E=; b=Lt9lwp6Pe69Lw5YNWlYQ3+cL+ 5pXsYHaYqSp23f+AjUk+vMoJA+dGEnmmMfJ67wPHgzK+CLnBaG/MCd1Kw2jJKOlqhP6hDCMNtkj2a iY0V+ib/9iwawbDecHtc86q8prlvgEEzi3OQBgYyBdx/Ezpm6Njq9sCiaQ9VsuYJOEM2nVSZbCb1Y dHS/z8FCangmXgCLeSAETUTSgG99Mb3P0B7bQlagT6R1t0SHfL7ACxDMvdwmYF2MQECLcDdlt5lCC FCmAVWXVcmjBOdxopoVUMSIzdGaN0PsVCCDodR+nNwGtatWl5QdizAcSvTogh2zM0HHOrIZmYlbPD yXUYPvTkA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kzt67-0002lf-UE; Thu, 14 Jan 2021 03:14:55 +0000 Received: from out2-smtp.messagingengine.com ([66.111.4.26]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kzt60-0002jV-OR for linux-arm-kernel@lists.infradead.org; Thu, 14 Jan 2021 03:14:49 +0000 Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailout.nyi.internal (Postfix) with ESMTP id 8FF3E5C01E5; Wed, 13 Jan 2021 22:14:48 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Wed, 13 Jan 2021 22:14:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aj.id.au; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm1; bh=KSRPuSjoX18Mr PCxVgf/9kBU5TXFu4khlyApjlCo9JI=; b=cNZBRnuOBN7WbiuP7Wt5mvNJbZ5nt 2vXJlNzZ91e2+gLpQtYxXE3ekUauzhgW4ZQEERfhz0Ez21uX2lc2UpTbfQD3j+HY jjp4YCBcNQGftApHTwYvmAvVoSks9lTLjcltkF+xl93qky1nJKjnA4luQy8rNaIS 6lA+1LGtlwo7w3JvytSX296SIw8MxRl5LoImQY/3isIG8fQZgClVh6B8jXZaMsDv 3lDK28WXOc0JriNba4LgQC6zBPNOrE6/6cwvwtaIqTott43hEbPPO4FO3WlMQiDl x5TCEv1BTJkpuErKfwIDjJqPc8XTMbItxGznKdkZZMW+JAJu+Gwdin7gQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm1; bh=KSRPuSjoX18MrPCxVgf/9kBU5TXFu4khlyApjlCo9JI=; b=fwa7iDCg /sWoYPo1k4pEg+ZxyU9/WzYT9XwOB2linVob98VQhJ/IwCDjgDWgaMHtc6X0M0Ih jVZ21w97Ex4njZhaUbZ1Aj3NLn8P+Ugc2c4hO5r2QZyQdvi5tZiGQEUdqtz9lNyY RMG9ohLN8vAd3g8nX9DW69cZbBD5JSljd3YATMrcqKQ6XWawEDI8bX+QjO0GVDWB ghE7MyuBx2hj0sW+TvfZ6oFeimfIMXzTaBySC7ZOuoIW6rsze2Ae815lTBhmWjVi 24J81hhsNzYO7CCiUkevfpc3T8VUSNVRu7ZK847+jyIR/Rn6CbX++dIqQJmy6Ll/ YiU4LW0prvy6+A== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedukedrtdeggdehjecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhephffvufffkffojghfggfgsedtkeertd ertddtnecuhfhrohhmpeetnhgurhgvficulfgvfhhfvghrhicuoegrnhgurhgvfiesrghj rdhiugdrrghuqeenucggtffrrghtthgvrhhnpeejgfdvveehteekveeggeellefgleette ejffelffdvudduveeiffegteelvefhteenucfkphepuddukedrvddutddrudejfedrgeek necuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomheprghnug hrvgifsegrjhdrihgurdgruh X-ME-Proxy: Received: from localhost.localdomain (ppp118-210-173-48.adl-adc-lon-bras34.tpg.internode.on.net [118.210.173.48]) by mail.messagingengine.com (Postfix) with ESMTPA id 63634240057; Wed, 13 Jan 2021 22:14:45 -0500 (EST) From: Andrew Jeffery To: linux-mmc@vger.kernel.org Subject: [PATCH v7 1/6] mmc: core: Add helper for parsing clock phase properties Date: Thu, 14 Jan 2021 13:44:28 +1030 Message-Id: <20210114031433.2388532-2-andrew@aj.id.au> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210114031433.2388532-1-andrew@aj.id.au> References: <20210114031433.2388532-1-andrew@aj.id.au> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210113_221448_888911_7D832995 X-CRM114-Status: GOOD ( 12.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, ulf.hansson@linaro.org, ryan_chen@aspeedtech.com, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, adrian.hunter@intel.com, robh+dt@kernel.org, joel@jms.id.au, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Drivers for MMC hosts that accept phase corrections can take advantage of the helper by embedding an instance of struct mmc_clk_phase_map in their private data and invoking mmc_of_parse_clk_phase() to extract phase parameters. It is the responsibility of the host driver to translate and apply the extracted values to hardware as required. Signed-off-by: Andrew Jeffery --- drivers/mmc/core/host.c | 44 ++++++++++++++++++++++++++++++++++++++++ include/linux/mmc/host.h | 13 ++++++++++++ 2 files changed, 57 insertions(+) diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 96b2ca1f1b06..74e853bb6948 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -163,6 +163,50 @@ static void mmc_retune_timer(struct timer_list *t) mmc_retune_needed(host); } +static void mmc_of_parse_timing_phase(struct device *dev, const char *prop, + struct mmc_clk_phase *phase) +{ + int degrees[2] = {0}; + int rc; + + rc = device_property_read_u32_array(dev, prop, degrees, 2); + phase->valid = !rc; + if (phase->valid) { + phase->in_deg = degrees[0]; + phase->out_deg = degrees[1]; + } +} + +void +mmc_of_parse_clk_phase(struct mmc_host *host, struct mmc_clk_phase_map *map) +{ + struct device *dev = host->parent; + + mmc_of_parse_timing_phase(dev, "clk-phase-legacy", + &map->phase[MMC_TIMING_LEGACY]); + mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs", + &map->phase[MMC_TIMING_MMC_HS]); + mmc_of_parse_timing_phase(dev, "clk-phase-sd-hs", + &map->phase[MMC_TIMING_SD_HS]); + mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr12", + &map->phase[MMC_TIMING_UHS_SDR12]); + mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr25", + &map->phase[MMC_TIMING_UHS_SDR25]); + mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr50", + &map->phase[MMC_TIMING_UHS_SDR50]); + mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr104", + &map->phase[MMC_TIMING_UHS_SDR104]); + mmc_of_parse_timing_phase(dev, "clk-phase-uhs-ddr50", + &map->phase[MMC_TIMING_UHS_DDR50]); + mmc_of_parse_timing_phase(dev, "clk-phase-mmc-ddr52", + &map->phase[MMC_TIMING_MMC_DDR52]); + mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs200", + &map->phase[MMC_TIMING_MMC_HS200]); + mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs400", + &map->phase[MMC_TIMING_MMC_HS400]); +} +EXPORT_SYMBOL(mmc_of_parse_clk_phase); + /** * mmc_of_parse() - parse host's device-tree node * @host: host whose node should be parsed. diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 01bba36545c5..8cf686d98a68 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -79,6 +79,17 @@ struct mmc_ios { bool enhanced_strobe; /* hs400es selection */ }; +struct mmc_clk_phase { + bool valid; + u16 in_deg; + u16 out_deg; +}; + +#define MMC_NUM_CLK_PHASES (MMC_TIMING_MMC_HS400 + 1) +struct mmc_clk_phase_map { + struct mmc_clk_phase phase[MMC_NUM_CLK_PHASES]; +}; + struct mmc_host; struct mmc_host_ops { @@ -490,6 +501,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *); int mmc_add_host(struct mmc_host *); void mmc_remove_host(struct mmc_host *); void mmc_free_host(struct mmc_host *); +void mmc_of_parse_clk_phase(struct mmc_host *host, + struct mmc_clk_phase_map *map); int mmc_of_parse(struct mmc_host *host); int mmc_of_parse_voltage(struct device_node *np, u32 *mask);