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bh=5ML389VIPDlcqH0is2ISEMU1iStQnOv84I3nRoWZJ5A=; b=S+ZXBXtoM3kYZ7moTsi46zITtMNggn+W1U0TSdd070MMRSTlFNA71pv5xloD9NA8AbCwdq y3M9J8EFMeV2Rf+sgx5tkcJTEXLnGXVZe6kAYE3EjuLFOvQdVtNO+myDjnFez1cu0ZGfij QCP/XsZCfhu1yyZJ/YR/TP7Vrk7em4k= From: Michael Walle To: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 02/11] mfd: Add support for Kontron sl28cpld management controller Date: Thu, 4 Jun 2020 23:10:30 +0200 Message-Id: <20200604211039.12689-3-michael@walle.cc> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200604211039.12689-1-michael@walle.cc> References: <20200604211039.12689-1-michael@walle.cc> MIME-Version: 1.0 X-Spam: Yes X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200604_141123_922869_25AFDB0E X-CRM114-Status: GOOD ( 17.83 ) X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [176.9.125.105 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marc Zyngier , Jean Delvare , Jason Cooper , Greg Kroah-Hartman , Shawn Guo , Linus Walleij , Andy Shevchenko , Li Yang , Bartosz Golaszewski , Michael Walle , Rob Herring , Thierry Reding , Mark Brown , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Thomas Gleixner , Wim Van Sebroeck , Lee Jones , Guenter Roeck Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add the core support for the board management controller found on the SMARC-sAL28 board. It consists of the following functions: - watchdog - GPIO controller - PWM controller - fan sensor - interrupt controller At the moment, this controller is used on the Kontron SMARC-sAL28 board. Please note that the MFD driver is defined as bool in the Kconfig because the next patch will add interrupt support. Signed-off-by: Michael Walle --- drivers/mfd/Kconfig | 19 ++++++++++ drivers/mfd/Makefile | 2 ++ drivers/mfd/sl28cpld.c | 79 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 100 insertions(+) create mode 100644 drivers/mfd/sl28cpld.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 4f8b73d92df3..5c0cd514d197 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -2109,5 +2109,24 @@ config SGI_MFD_IOC3 If you have an SGI Origin, Octane, or a PCI IOC3 card, then say Y. Otherwise say N. +config MFD_SL28CPLD + bool "Kontron sl28 core driver" + depends on I2C=y + depends on OF + select REGMAP_I2C + select MFD_CORE + help + This option enables support for the board management controller + found on the Kontron sl28 CPLD. You have to select individual + functions, such as watchdog, GPIO, etc, under the corresponding menus + in order to enable them. + + Currently supported boards are: + + Kontron SMARC-sAL28 + + To compile this driver as a module, choose M here: the module will be + called sl28cpld. + endmenu endif diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 9367a92f795a..be59fb40aa28 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -264,3 +264,5 @@ obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o obj-$(CONFIG_MFD_STMFX) += stmfx.o obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o + +obj-$(CONFIG_MFD_SL28CPLD) += sl28cpld.o diff --git a/drivers/mfd/sl28cpld.c b/drivers/mfd/sl28cpld.c new file mode 100644 index 000000000000..a23194bb6efa --- /dev/null +++ b/drivers/mfd/sl28cpld.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core for the sl28cpld. + * + * Copyright 2019 Kontron Europe GmbH + */ + +#include +#include +#include +#include +#include +#include +#include + +#define SL28CPLD_VERSION 0x03 +#define SL28CPLD_MIN_REQ_VERSION 14 + +struct sl28cpld { + struct device *dev; + struct regmap *regmap; +}; + +static const struct regmap_config sl28cpld_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .reg_stride = 1, +}; + +static int sl28cpld_probe(struct i2c_client *i2c) +{ + struct sl28cpld *sl28cpld; + struct device *dev = &i2c->dev; + unsigned int cpld_version; + int ret; + + sl28cpld = devm_kzalloc(dev, sizeof(*sl28cpld), GFP_KERNEL); + if (!sl28cpld) + return -ENOMEM; + + sl28cpld->regmap = devm_regmap_init_i2c(i2c, &sl28cpld_regmap_config); + if (IS_ERR(sl28cpld->regmap)) + return PTR_ERR(sl28cpld->regmap); + + ret = regmap_read(sl28cpld->regmap, SL28CPLD_VERSION, &cpld_version); + if (ret) + return ret; + + if (cpld_version < SL28CPLD_MIN_REQ_VERSION) { + dev_err(dev, "unsupported CPLD version %d\n", cpld_version); + return -ENODEV; + } + + sl28cpld->dev = dev; + i2c_set_clientdata(i2c, sl28cpld); + + dev_info(dev, "successfully probed. CPLD version %d\n", cpld_version); + + return devm_of_platform_populate(&i2c->dev); +} + +static const struct of_device_id sl28cpld_of_match[] = { + { .compatible = "kontron,sl28cpld-r1", }, + {} +}; +MODULE_DEVICE_TABLE(of, sl28cpld_of_match); + +static struct i2c_driver sl28cpld_driver = { + .probe_new = sl28cpld_probe, + .driver = { + .name = "sl28cpld", + .of_match_table = of_match_ptr(sl28cpld_of_match), + }, +}; +module_i2c_driver(sl28cpld_driver); + +MODULE_DESCRIPTION("sl28cpld MFD Core Driver"); +MODULE_AUTHOR("Michael Walle "); +MODULE_LICENSE("GPL");