From patchwork Sat Dec 4 21:58:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 521766 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1F6F8C4332F for ; Sat, 4 Dec 2021 21:58:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345413AbhLDWB5 (ORCPT ); Sat, 4 Dec 2021 17:01:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47486 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352179AbhLDWBz (ORCPT ); Sat, 4 Dec 2021 17:01:55 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54DACC061A83 for ; Sat, 4 Dec 2021 13:58:29 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id c4so13632780wrd.9 for ; Sat, 04 Dec 2021 13:58:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pVkIUWY0OSvWRa+LskKzcmg/hbEtnNu06lHh+/SBJ88=; b=jtTQqh7N0SLriwGsBR5oh0PgT7Jb6IvnfLcNr4UJCU7ejNXjRbNwMSbzX1KGXmaaG6 GU6xm/tW7D46MPx91EQjMCL1IcBgFZ0K2v/Le4wMyzyp2Ov4UTNKsiFw44dODIPekDk1 Q8cZC9SdVLtkFHC+Re3xzQ4cZoEr3Y8v/tm5UDFeGXONzTy0dow3wKiKdv6mLfReRmaJ 6C4nf6bFbfs6MaIuSYakLR5kixjBjabh4cg98kzUBjWNsLTmJXf8VRcHYUtUy3vOXfIi 8ZI77swJ9/21gyKgo181tXTClcrqpKdn3chSh3tPLxo4Sv5XQ+gfV+fp15C9005U/QF2 Xp2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pVkIUWY0OSvWRa+LskKzcmg/hbEtnNu06lHh+/SBJ88=; b=xNU1AL9Q/zQXecUhBDiwuvEJri0+6UQK1DgGY3LzfmzJ7xZuOlZceX03uC5NQ60QNl oqf1//wD06qyur+0zZ0IHdsNJ24TUAlMilE0bi9c3QrxJwaLuIagaP3OWY4Z06TVzE/n sdAWnI+fj/6pWyutU17tVXiWgiEHejqn5fZgfuO94dpBWAOWIHw5XG578I57EkX+OrDO RkaQQN1vMhH2XM3yY1h0O/ICri7t8cvfvdsLazIFvWuDOcA861u+BDSygmIleZKIvK7k cFEMbUM9YoVt6oXp8ONaV4AZbyo8AuQpDZ2ukkUq4IUGEkNvJ1CzNttnanH8zQgD3Wvq rvXQ== X-Gm-Message-State: AOAM531v/o/uC40y//q4C2Rn6VzLyCAZK35HCZDbVcew2fuY5zm0w3zk Lyuqt6/qS9crFjzXjpYSFyMQ7Q== X-Google-Smtp-Source: ABdhPJysRLvjvu3wwayEb3/5YITYMgCYzIXsHPLKl9uQ1yLZrkaU1RGJ4o2xUUWgaAf5lepVHhuPxw== X-Received: by 2002:adf:f1cc:: with SMTP id z12mr31501907wro.395.1638655107961; Sat, 04 Dec 2021 13:58:27 -0800 (PST) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id g13sm9318810wrd.57.2021.12.04.13.58.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Dec 2021 13:58:27 -0800 (PST) From: Sam Protsenko To: Krzysztof Kozlowski , Rob Herring Cc: Jaewon Kim , Chanho Park , David Virag , Youngmin Nam , Wolfram Sang , Arnd Bergmann , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH v2 RESEND 5/8] i2c: exynos5: Add bus clock support Date: Sat, 4 Dec 2021 23:58:17 +0200 Message-Id: <20211204215820.17378-6-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211204215820.17378-1-semen.protsenko@linaro.org> References: <20211204215820.17378-1-semen.protsenko@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org In new Exynos SoCs (like Exynos850) where HSI2C is implemented as a part of USIv2 block, there are two clocks provided to HSI2C controller: - PCLK: bus clock (APB), provides access to register interface - IPCLK: operating IP-core clock; SCL is derived from this one Both clocks have to be asserted for HSI2C to be functional in that case. Add code to obtain and enable/disable PCLK in addition to already handled operating clock. Make it optional though, as older Exynos SoC variants only have one HSI2C clock. Signed-off-by: Sam Protsenko Reviewed-by: Krzysztof Kozlowski Reviewed-by: Chanho Park --- Changes in v2: - Added R-b tag by Krzysztof Kozlowski - Added R-b tag by Chanho Park drivers/i2c/busses/i2c-exynos5.c | 46 ++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 8 deletions(-) diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c index 5198e71e8dab..9cde5ecb9449 100644 --- a/drivers/i2c/busses/i2c-exynos5.c +++ b/drivers/i2c/busses/i2c-exynos5.c @@ -182,7 +182,8 @@ struct exynos5_i2c { unsigned int irq; void __iomem *regs; - struct clk *clk; + struct clk *clk; /* operating clock */ + struct clk *pclk; /* bus clock */ struct device *dev; int state; @@ -757,10 +758,14 @@ static int exynos5_i2c_xfer(struct i2c_adapter *adap, struct exynos5_i2c *i2c = adap->algo_data; int i, ret; - ret = clk_enable(i2c->clk); + ret = clk_enable(i2c->pclk); if (ret) return ret; + ret = clk_enable(i2c->clk); + if (ret) + goto err_pclk; + for (i = 0; i < num; ++i) { ret = exynos5_i2c_xfer_msg(i2c, msgs + i, i + 1 == num); if (ret) @@ -768,6 +773,8 @@ static int exynos5_i2c_xfer(struct i2c_adapter *adap, } clk_disable(i2c->clk); +err_pclk: + clk_disable(i2c->pclk); return ret ?: num; } @@ -807,10 +814,18 @@ static int exynos5_i2c_probe(struct platform_device *pdev) return -ENOENT; } - ret = clk_prepare_enable(i2c->clk); + i2c->pclk = devm_clk_get(&pdev->dev, "hsi2c_pclk"); + if (IS_ERR(i2c->pclk)) + i2c->pclk = NULL; /* pclk is optional */ + + ret = clk_prepare_enable(i2c->pclk); if (ret) return ret; + ret = clk_prepare_enable(i2c->clk); + if (ret) + goto err_pclk; + i2c->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(i2c->regs)) { ret = PTR_ERR(i2c->regs); @@ -853,6 +868,7 @@ static int exynos5_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, i2c); clk_disable(i2c->clk); + clk_disable(i2c->pclk); dev_info(&pdev->dev, "%s: HSI2C adapter\n", dev_name(&i2c->adap.dev)); @@ -860,6 +876,9 @@ static int exynos5_i2c_probe(struct platform_device *pdev) err_clk: clk_disable_unprepare(i2c->clk); + + err_pclk: + clk_disable_unprepare(i2c->pclk); return ret; } @@ -870,6 +889,7 @@ static int exynos5_i2c_remove(struct platform_device *pdev) i2c_del_adapter(&i2c->adap); clk_unprepare(i2c->clk); + clk_unprepare(i2c->pclk); return 0; } @@ -881,6 +901,7 @@ static int exynos5_i2c_suspend_noirq(struct device *dev) i2c_mark_adapter_suspended(&i2c->adap); clk_unprepare(i2c->clk); + clk_unprepare(i2c->pclk); return 0; } @@ -890,21 +911,30 @@ static int exynos5_i2c_resume_noirq(struct device *dev) struct exynos5_i2c *i2c = dev_get_drvdata(dev); int ret = 0; - ret = clk_prepare_enable(i2c->clk); + ret = clk_prepare_enable(i2c->pclk); if (ret) return ret; + ret = clk_prepare_enable(i2c->clk); + if (ret) + goto err_pclk; + ret = exynos5_hsi2c_clock_setup(i2c); - if (ret) { - clk_disable_unprepare(i2c->clk); - return ret; - } + if (ret) + goto err_clk; exynos5_i2c_init(i2c); clk_disable(i2c->clk); + clk_disable(i2c->pclk); i2c_mark_adapter_resumed(&i2c->adap); return 0; + +err_clk: + clk_disable_unprepare(i2c->clk); +err_pclk: + clk_disable_unprepare(i2c->pclk); + return ret; } #endif