From patchwork Mon Feb 26 16:53:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 1904513 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=OGL/k54Z; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4Tk6CF4zPpz23qK for ; Tue, 27 Feb 2024 03:54:01 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=OGL/k54Z; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Tk6CF3Fgqz3vfJ for ; Tue, 27 Feb 2024 03:54:01 +1100 (AEDT) X-Original-To: linux-fsi@lists.ozlabs.org Delivered-To: linux-fsi@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=OGL/k54Z; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com; envelope-from=eajames@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Tk6C723r9z3vbc for ; Tue, 27 Feb 2024 03:53:55 +1100 (AEDT) Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 41QGSDtg014784; Mon, 26 Feb 2024 16:53:46 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=0qbOHG7gDL7BluVHG6aIFuWkCkqtnciMO6tHFzvcS9c=; b=OGL/k54Za+Oi+Ik9UMAZN1dYIHrAG7YQzCySyQaf5UnXUZCWg6LF40yFVtQm1hZ1JfR3 IuxVtXlXADkOVq2JgkLNnoRf9yg18DKi5x1vuoTWSDOcT0b3qZUxlPAbqxkD4OZU2pE8 GESoxCq5XaCI9PuJj2asZVsYwfwSBttiEh0K+LTbI4YlD8K7cjoEDd3jIuI2JgoV8+f3 fGMp1UZWnn4AnE7cPOnI+F4kbbGG8vvK+JD6gz2YIH8cxuS0yNkuZ+xh/n0REgNEnkLg 4yXL1Vt/eMezBraH0xiqrf88LLaU/hNOcBIVsDeir80fDiDqSfaTB2UUKkL3Pg0RRhrm Lg== Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3wgx6g8nv7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 26 Feb 2024 16:53:46 +0000 Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 41QFvbid012371; Mon, 26 Feb 2024 16:53:45 GMT Received: from smtprelay02.wdc07v.mail.ibm.com ([172.16.1.69]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 3wfwg21xx9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 26 Feb 2024 16:53:45 +0000 Received: from smtpav05.wdc07v.mail.ibm.com (smtpav05.wdc07v.mail.ibm.com [10.39.53.232]) by smtprelay02.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 41QGrgQt18481720 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 26 Feb 2024 16:53:45 GMT Received: from smtpav05.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DFE8B58061; Mon, 26 Feb 2024 16:53:42 +0000 (GMT) Received: from smtpav05.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 336E558053; Mon, 26 Feb 2024 16:53:42 +0000 (GMT) Received: from slate16.aus.stglabs.ibm.com (unknown [9.61.57.130]) by smtpav05.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 26 Feb 2024 16:53:42 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v2 25/31] i2c: fsi: Calculate clock divider from local bus frequency Date: Mon, 26 Feb 2024 10:53:15 -0600 Message-Id: <20240226165321.91976-26-eajames@linux.ibm.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240226165321.91976-1-eajames@linux.ibm.com> References: <20240226165321.91976-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Qx9NO90-TIrXxkEaxq-0tWytwCPDqHVy X-Proofpoint-ORIG-GUID: Qx9NO90-TIrXxkEaxq-0tWytwCPDqHVy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-26_11,2024-02-26_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 bulkscore=0 spamscore=0 mlxlogscore=987 priorityscore=1501 adultscore=0 phishscore=0 impostorscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402260128 X-BeenThere: linux-fsi@lists.ozlabs.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, conor+dt@kernel.org, andi.shyti@kernel.org, alistair@popple.id.au, linux-kernel@vger.kernel.org, lakshmiy@us.ibmcom, linux-i2c@vger.kernel.org, krzysztof.kozlowski+dt@linaro.org, robh@kernel.org Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" Use the new FSI device local bus clock to calculate the proper i2c clock divder and look up an optional clock-frequency property from device tree. Change the default clock divider to 7 now that the default local bus clock divider has been reduced as well. Signed-off-by: Eddie James --- drivers/i2c/busses/i2c-fsi.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 10332693edf0..eaecf156ac31 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -27,7 +27,8 @@ #define FSI_ENGID_I2C 0x7 -#define I2C_DEFAULT_CLK_DIV 6 +#define I2C_DEFAULT_CLK_DIV 7 +#define I2C_DEFAULT_CLK_RATE 400000 /* i2c registers */ #define I2C_FSI_FIFO 0x00 @@ -150,6 +151,7 @@ struct fsi_i2c_master { u8 fifo_size; struct list_head ports; struct mutex lock; + u32 clock_div; }; struct fsi_i2c_port { @@ -194,7 +196,7 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c) if (rc) return rc; - mode |= FIELD_PREP(I2C_MODE_CLKDIV, I2C_DEFAULT_CLK_DIV); + mode |= FIELD_PREP(I2C_MODE_CLKDIV, i2c->clock_div); rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode); if (rc) return rc; @@ -680,6 +682,7 @@ static int fsi_i2c_probe(struct device *dev) struct fsi_i2c_port *port; struct device_node *np; u32 port_no, ports, stat; + u32 lbus; int rc; i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); @@ -689,6 +692,20 @@ static int fsi_i2c_probe(struct device *dev) mutex_init(&i2c->lock); i2c->fsi = to_fsi_dev(dev); INIT_LIST_HEAD(&i2c->ports); + i2c->clock_div = I2C_DEFAULT_CLK_DIV; + + lbus = fsi_device_local_bus_frequency(i2c->fsi); + if (lbus) { + u32 clock = I2C_DEFAULT_CLK_RATE; + + if (!device_property_read_u32(dev, "clock-frequency", &clock)) { + if (!clock) + clock = I2C_DEFAULT_CLK_RATE; + } + + // i2c clock rate = local bus clock / (4 * (i2c clock div + 1)) + i2c->clock_div = (((lbus + (clock - 1)) / clock) / 4) - 1; + } rc = fsi_i2c_dev_init(i2c); if (rc)