From patchwork Wed Jun 15 19:12:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dinh Nguyen X-Patchwork-Id: 582030 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 76AC9C43334 for ; Wed, 15 Jun 2022 19:12:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347585AbiFOTMj (ORCPT ); Wed, 15 Jun 2022 15:12:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345405AbiFOTMg (ORCPT ); Wed, 15 Jun 2022 15:12:36 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 866C36588; Wed, 15 Jun 2022 12:12:35 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 16AC2B81DDC; Wed, 15 Jun 2022 19:12:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 827E6C3411E; Wed, 15 Jun 2022 19:12:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655320352; bh=EmBZNbmAwzZz5T1AwRENrG2S2XQx9T3QhcM/Fcd4TYo=; h=From:To:Cc:Subject:Date:From; b=Exx7mwM5si+NElK18+gIfDw0eViHbp3efkfqn9QWiC9xd+IKVqm9Z82BEc2YSi+/S y9ae/+P0Ecc53X/3L2/nG0wUvhwkslFYIuDdR7uPCwPrpwG2+6xwTUqbpkPgJFQflr nSdcB6LOOCSq8QeUTYmK7Ffi30aBUDuMZJMe9OmcXCa0e3np6gslAGEuDA0e13Mf2X 6byVkD+Vzjh0MwiuSgr70660bUPf1/+G82PFehzAplAX5RZwFFhroTt0+o6YLRUZKV r3QjPVaZ0ENB6qcUvgF7wXrRK/GlztlvOb09BTZWJcFaEAxzDWz/CqX1QdSjAiP/I9 oqkw8VmK9koiQ== From: Dinh Nguyen To: jarkko.nikula@linux.intel.com Cc: dinguyen@kernel.org, andriy.shevchenko@linux.intel.com, mika.westerberg@linux.intel.com, robh+dt@kernel.org, krzk+dt@kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCHv4 1/2] i2c: designware: introduce a custom scl recovery for SoCFPGA platforms Date: Wed, 15 Jun 2022 14:12:13 -0500 Message-Id: <20220615191214.826879-1-dinguyen@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The I2C pins on the SoCFPGA platforms do not go through a GPIO module, thus cannot be recovered by the default method of by doing a GPIO access. Only a reset of the I2C IP block can a recovery be successful. The assignment of the recover_bus needs to get done before the call to devm_gpiod_get_optional(), otherwise, the assignment is not taking place because of an error after returning from devm_gpiod_get_optional(). Signed-off-by: Dinh Nguyen --- v4: re-arrange code per Andy Shevchenko's recommendation v3: simplify the function update commit message v2: remove change to MODEL_MASK s/i2c_custom_scl_recovery/i2c_socfpga_scl_recovery --- drivers/i2c/busses/i2c-designware-core.h | 1 + drivers/i2c/busses/i2c-designware-master.c | 50 ++++++++++++++++++--- drivers/i2c/busses/i2c-designware-platdrv.c | 1 + 3 files changed, 46 insertions(+), 6 deletions(-) diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 70b80e710990..7b22ec1d6a96 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -303,6 +303,7 @@ struct dw_i2c_dev { #define MODEL_MSCC_OCELOT BIT(8) #define MODEL_BAIKAL_BT1 BIT(9) #define MODEL_AMD_NAVI_GPU BIT(10) +#define MODEL_SOCFPGA BIT(11) #define MODEL_MASK GENMASK(11, 8) /* diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c index 44a94b225ed8..6b75a08a1c1f 100644 --- a/drivers/i2c/busses/i2c-designware-master.c +++ b/drivers/i2c/busses/i2c-designware-master.c @@ -813,10 +813,26 @@ static void i2c_dw_unprepare_recovery(struct i2c_adapter *adap) i2c_dw_init_master(dev); } -static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev) +static int i2c_socfpga_scl_recovery(struct i2c_adapter *adap) +{ + struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; + + bri->prepare_recovery(adap); + bri->unprepare_recovery(adap); + + return 0; +} + +static int i2c_dw_init_socfpga_recovery_info(struct dw_i2c_dev *dev, + struct i2c_bus_recovery_info *rinfo) +{ + rinfo->recover_bus = i2c_socfpga_scl_recovery; + return 1; +} + +static int i2c_dw_init_generic_recovery_info(struct dw_i2c_dev *dev, + struct i2c_bus_recovery_info *rinfo) { - struct i2c_bus_recovery_info *rinfo = &dev->rinfo; - struct i2c_adapter *adap = &dev->adapter; struct gpio_desc *gpio; gpio = devm_gpiod_get_optional(dev->dev, "scl", GPIOD_OUT_HIGH); @@ -831,16 +847,38 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev) rinfo->sda_gpiod = gpio; rinfo->recover_bus = i2c_generic_scl_recovery; - rinfo->prepare_recovery = i2c_dw_prepare_recovery; - rinfo->unprepare_recovery = i2c_dw_unprepare_recovery; - adap->bus_recovery_info = rinfo; dev_info(dev->dev, "running with gpio recovery mode! scl%s", rinfo->sda_gpiod ? ",sda" : ""); + return 1; +} + +static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev) +{ + struct i2c_bus_recovery_info *rinfo = &dev->rinfo; + struct i2c_adapter *adap = &dev->adapter; + int ret; + + switch (dev->flags & MODEL_MASK) { + case MODEL_SOCFPGA: + ret = i2c_dw_init_socfpga_recovery_info(dev, rinfo); + break; + default: + ret = i2c_dw_init_generic_recovery_info(dev, rinfo); + break; + } + if (ret <= 0) + return ret; + + rinfo->prepare_recovery = i2c_dw_prepare_recovery; + rinfo->unprepare_recovery = i2c_dw_unprepare_recovery; + adap->bus_recovery_info = rinfo; + return 0; } + static int amd_i2c_adap_quirk(struct dw_i2c_dev *dev) { struct i2c_adapter *adap = &dev->adapter; diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 70ade5306e45..b33e015e6732 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -153,6 +153,7 @@ static const struct of_device_id dw_i2c_of_match[] = { { .compatible = "snps,designware-i2c", }, { .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT }, { .compatible = "baikal,bt1-sys-i2c", .data = (void *)MODEL_BAIKAL_BT1 }, + { .compatible = "intel,socfpga-i2c", .data = (void *)MODEL_SOCFPGA }, {}, }; MODULE_DEVICE_TABLE(of, dw_i2c_of_match);