From patchwork Wed Dec 1 19:04:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 519461 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 E0EAFC433F5 for ; Wed, 1 Dec 2021 19:05:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352632AbhLATIr (ORCPT ); Wed, 1 Dec 2021 14:08:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352630AbhLATI1 (ORCPT ); Wed, 1 Dec 2021 14:08:27 -0500 Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43A0CC06174A for ; Wed, 1 Dec 2021 11:05:06 -0800 (PST) Received: by mail-lj1-x22a.google.com with SMTP id j18so36921731ljc.12 for ; Wed, 01 Dec 2021 11:05:06 -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=xFxNqmuJVHm+4b6lR+Oly3cvobR2qTXZL1lEPZhFsrE=; b=RdnzaNKoUt5b+9agSRLYKRRF9nuVxJFlKMirK78Y43kiqglTOpkdctVQ1SKOm2eFRf 0xtzHaQg0RSsBmtrwxDFDaxljYRW0DBKq3YcdqJDvNC6l8Ghs81VvVpiO63Xtv5tfkXC OBie9N7C1xsNZ4MxtOhoHVtQCPHXcdbJHqRuRDoqEK+hJ4pg4aC4oDWjWiG3PDKNHOId 8sAN6So4lh2PBBJ1XM8KBXJ34ABpRQoGhR5z9Tl/z4NncAeieGYGVxnw9cBjXGLkblIo lTcHBIq0dIhFXBkgrmpj8XXl95XzDt1Hcle+tbSoVOzTe7H/1pB/f0YmmbjPdLjQE995 sbsA== 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=xFxNqmuJVHm+4b6lR+Oly3cvobR2qTXZL1lEPZhFsrE=; b=Kwws8/ZNIU/51QlKPPpuQWT18xag+4AFEZ9tTf4m71QmJBY0b6IBWseYcL9+dZeKxp Xiy+pcCdM+D/9e1xvsN9nOD7c2Vq49QvLstUoIcjvlQ1Uw8tXtG9X5AtaldKnntsqMcB HJk5H1Zp/Wh1b7oWo82IoloVQzehCcGxW9GrMBoKYBzZDuTX7FGHTTMJk0UHQHWpQOGH 0gJ4foY4pzI9ERuKPtAdgEZi/nZ6VMYtlGDhlyLGDq6SALs9MOlotwoKD9reUkik7SCg Zg5ZoelxFCoSyMvNspEeFmh3rPICXTpozvZWU0WoR1bWhJnFv9lkUCLT3tQeIs+Yan82 RJGA== X-Gm-Message-State: AOAM530TBOa0qcRVm2qtfnKEatzO6WXmJ3Hg/WZTu4bmBGepFXA3NFYn XYmIvU57DQW2pWHLsyvmodqyfA== X-Google-Smtp-Source: ABdhPJw9cTGW2HXAXJwsyWcNxIPUwF4D6YMKXKVz4KwpsKcwqB6bz/QYaDQRAoJPBAB71ZlXYeIOOg== X-Received: by 2002:a05:651c:106b:: with SMTP id y11mr7225777ljm.504.1638385504477; Wed, 01 Dec 2021 11:05:04 -0800 (PST) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id h17sm79175lfj.160.2021.12.01.11.05.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Dec 2021 11:05:04 -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 5/6] i2c: exynos5: Add bus clock support Date: Wed, 1 Dec 2021 21:04:54 +0200 Message-Id: <20211201190455.31646-6-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211201190455.31646-1-semen.protsenko@linaro.org> References: <20211201190455.31646-1-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 --- 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