{"id":819205,"url":"http://patchwork.ozlabs.org/api/patches/819205/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-i2c/patch/1506523943-8632-3-git-send-email-kamlakant.patel@cavium.com/","project":{"id":35,"url":"http://patchwork.ozlabs.org/api/projects/35/?format=json","name":"Linux I2C development","link_name":"linux-i2c","list_id":"linux-i2c.vger.kernel.org","list_email":"linux-i2c@vger.kernel.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<1506523943-8632-3-git-send-email-kamlakant.patel@cavium.com>","list_archive_url":null,"date":"2017-09-27T14:52:22","name":"[2/3] i2c: xlp9xx: Get clock frequency with clk API","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"a54c832421b4ea70af4696066617aa79ff86820a","submitter":{"id":72456,"url":"http://patchwork.ozlabs.org/api/people/72456/?format=json","name":"Kamlakant Patel","email":"kamlakant.patel@cavium.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-i2c/patch/1506523943-8632-3-git-send-email-kamlakant.patel@cavium.com/mbox/","series":[{"id":5383,"url":"http://patchwork.ozlabs.org/api/series/5383/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-i2c/list/?series=5383","date":"2017-09-27T14:52:20","name":"i2c-xlp9xx: update i2c driver to handle I2C_M_RECV_LEN flag","version":1,"mbox":"http://patchwork.ozlabs.org/series/5383/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/819205/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/819205/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; 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Wed, 27 Sep 2017 14:52:31 +0000"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=CAVIUMNETWORKS.onmicrosoft.com; s=selector1-cavium-com;\n\th=From:Date:Subject:Message-ID:Content-Type:MIME-Version;\n\tbh=8eDkXi/BKtdGUvPcaNxdsOIejENPCda1Boz8xJrwBTo=;\n\tb=emxR1ZhlMTb3Hvd2MhvLp/Fy/EpP/8WK5BPPagtLAF/24GC40y6AJy+tOqc4CIhUDUDCk/NL79/KGJz/HCrJBg3DROqqlPuNI3HY64RpJ8AXg1NeVsTC1t8jxaHGWwWQotZpHAO4XllhOK/xUC5oSDOb+jpGeJbqoQhWeQrgEVw=","From":"Kamlakant Patel ","To":"linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org","Cc":"Jayachandran C ,\n\tWolfram Sang ,\n\tMika Westerberg ,\n\tKamlakant Patel ","Subject":"[PATCH 2/3] i2c: xlp9xx: Get clock frequency with clk API","Date":"Wed, 27 Sep 2017 20:22:22 +0530","Message-Id":"<1506523943-8632-3-git-send-email-kamlakant.patel@cavium.com>","X-Mailer":"git-send-email 2.7.4","In-Reply-To":"<1506523943-8632-1-git-send-email-kamlakant.patel@cavium.com>","References":"<1506523943-8632-1-git-send-email-kamlakant.patel@cavium.com>","MIME-Version":"1.0","Content-Type":"text/plain","X-Originating-IP":"[111.93.218.67]","X-ClientProxiedBy":"BMXPR01CA0043.INDPRD01.PROD.OUTLOOK.COM (10.174.214.29) To\n\tBN4PR07MB2129.namprd07.prod.outlook.com (10.164.63.11)","X-MS-PublicTrafficType":"Email","X-MS-Office365-Filtering-Correlation-Id":"2fb33e8c-8371-42a2-94f3-08d505b76267","X-Microsoft-Antispam":"UriScan:; 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SFP:1101; SCL:1; SRVR:BN4PR07MB2129;\n\tH:kamlakant--T110-II.caveonetworks.com; FPR:; SPF:None;\n\tPTR:InfoNoRecords; A:1; MX:1; LANG:en; ","Received-SPF":"None (protection.outlook.com: cavium.com does not designate\n\tpermitted sender hosts)","SpamDiagnosticOutput":"1:99","SpamDiagnosticMetadata":"NSPM","X-OriginatorOrg":"cavium.com","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"27 Sep 2017 14:52:31.2308\n\t(UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"711e4ccf-2e9b-4bcf-a551-4094005b6194","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"BN4PR07MB2129","Sender":"linux-i2c-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"linux-i2c@vger.kernel.org"},"content":"From: Jayachandran C \n\nGet the input clock frequency to the controller from the linux clk\nAPI, if it is available. This allows us to pass in the block input\nfrequency either from ACPI (using APD) or from device tree.\n\nThe old hardcoded frequency is used as default for backwards compatibility.\n\nSigned-off-by: Jayachandran C \nSigned-off-by: Kamlakant Patel \n---\n drivers/i2c/busses/i2c-xlp9xx.c | 14 +++++++++++++-\n 1 file changed, 13 insertions(+), 1 deletion(-)","diff":"diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c\nindex 6b106e9..f0bef2d 100644\n--- a/drivers/i2c/busses/i2c-xlp9xx.c\n+++ b/drivers/i2c/busses/i2c-xlp9xx.c\n@@ -7,6 +7,7 @@\n */\n \n #include \n+#include \n #include \n #include \n #include \n@@ -84,6 +85,7 @@ struct xlp9xx_i2c_dev {\n \tu32 __iomem *base;\n \tu32 msg_buf_remaining;\n \tu32 msg_len;\n+\tu32 ip_clk_hz;\n \tu32 clk_hz;\n \tu32 msg_err;\n \tu8 *msg_buf;\n@@ -213,7 +215,7 @@ static int xlp9xx_i2c_init(struct xlp9xx_i2c_dev *priv)\n \t * The controller uses 5 * SCL clock internally.\n \t * So prescale value should be divided by 5.\n \t */\n-\tprescale = DIV_ROUND_UP(XLP9XX_I2C_IP_CLK_FREQ, priv->clk_hz);\n+\tprescale = DIV_ROUND_UP(priv->ip_clk_hz, priv->clk_hz);\n \tprescale = ((prescale - 8) / 5) - 1;\n \txlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_RST);\n \txlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_EN |\n@@ -342,9 +344,19 @@ static const struct i2c_algorithm xlp9xx_i2c_algo = {\n static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,\n \t\t\t\t struct xlp9xx_i2c_dev *priv)\n {\n+\tstruct clk *clk;\n \tu32 freq;\n \tint err;\n \n+\tclk = devm_clk_get(&pdev->dev, NULL);\n+\tif (IS_ERR(clk)) {\n+\t\tpriv->ip_clk_hz = XLP9XX_I2C_IP_CLK_FREQ;\n+\t\tdev_dbg(&pdev->dev, \"using default input frequency %u\\n\",\n+\t\t\tpriv->ip_clk_hz);\n+\t} else {\n+\t\tpriv->ip_clk_hz = clk_get_rate(clk);\n+\t}\n+\n \terr = device_property_read_u32(&pdev->dev, \"clock-frequency\", &freq);\n \tif (err) {\n \t\tfreq = XLP9XX_I2C_DEFAULT_FREQ;\n","prefixes":["2/3"]}