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[88.207.97.15]) by smtp.googlemail.com with ESMTPSA id d15sm1822988ejj.42.2021.04.30.05.35.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Apr 2021 05:35:21 -0700 (PDT) From: Robert Marko To: lee.jones@linaro.org, robh+dt@kernel.org, linus.walleij@linaro.org, bgolaszewski@baylibre.com, jdelvare@suse.com, linux@roeck-us.net, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-hwmon@vger.kernel.org Cc: luka.perkov@sartura.hr, jmp@epiphyte.org, pmenzel@molgen.mpg.de, buczek@molgen.mpg.de, Robert Marko Subject: [PATCH 1/6] mfd: Add Delta TN48M CPLD driver Date: Fri, 30 Apr 2021 14:35:06 +0200 Message-Id: <20210430123511.116057-1-robert.marko@sartura.hr> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Delta TN48M switches have a Lattice CPLD that serves multiple purposes including being a GPIO expander. So lets add the MFD core driver for it. Signed-off-by: Robert Marko Reported-by: kernel test robot --- drivers/mfd/Kconfig | 13 +++ drivers/mfd/Makefile | 1 + drivers/mfd/tn48m-cpld.c | 181 ++++++++++++++++++++++++++++++++++++++ include/linux/mfd/tn48m.h | 30 +++++++ 4 files changed, 225 insertions(+) create mode 100644 drivers/mfd/tn48m-cpld.c create mode 100644 include/linux/mfd/tn48m.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b74efa469e90..809041f98d71 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -297,6 +297,19 @@ config MFD_ASIC3 This driver supports the ASIC3 multifunction chip found on many PDAs (mainly iPAQ and HTC based ones) +config MFD_TN48M_CPLD + tristate "Delta Networks TN48M switch CPLD driver" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + Select this option to enable support for Delta Networks TN48M switch + CPLD. It consists of GPIO and hwmon drivers. + CPLD provides GPIOS-s for the SFP slots as well as power supply + related information. + Driver provides debugfs information about the board model as + well as hardware and CPLD revision information. + config PMIC_DA903X bool "Dialog Semiconductor DA9030/DA9034 PMIC Support" depends on I2C=y diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 834f5463af28..974663341f08 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_MFD_TI_LP87565) += lp87565.o obj-$(CONFIG_MFD_DAVINCI_VOICECODEC) += davinci_voicecodec.o obj-$(CONFIG_MFD_DM355EVM_MSP) += dm355evm_msp.o obj-$(CONFIG_MFD_TI_AM335X_TSCADC) += ti_am335x_tscadc.o +obj-$(CONFIG_MFD_TN48M_CPLD) += tn48m-cpld.o obj-$(CONFIG_MFD_STA2X11) += sta2x11-mfd.o obj-$(CONFIG_MFD_STMPE) += stmpe.o diff --git a/drivers/mfd/tn48m-cpld.c b/drivers/mfd/tn48m-cpld.c new file mode 100644 index 000000000000..b84510fb630a --- /dev/null +++ b/drivers/mfd/tn48m-cpld.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Delta TN48M CPLD parent driver + * + * Copyright 2020 Sartura Ltd + * + * Author: Robert Marko + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct mfd_cell tn48m_cell[] = {}; + +static const struct regmap_config tn48m_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x40, +}; + +static int hardware_version_show(struct seq_file *s, void *data) +{ + struct tn48m_data *priv = s->private; + unsigned int regval; + char *buf; + + regmap_read(priv->regmap, HARDWARE_VERSION_ID, ®val); + + switch (FIELD_GET(HARDWARE_VERSION_MASK, regval)) { + case HARDWARE_VERSION_EVT1: + buf = "EVT1"; + break; + case HARDWARE_VERSION_EVT2: + buf = "EVT2"; + break; + case HARDWARE_VERSION_DVT: + buf = "DVT"; + break; + case HARDWARE_VERSION_PVT: + buf = "PVT"; + break; + default: + buf = "Unknown"; + break; + } + + seq_printf(s, "%s\n", buf); + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(hardware_version); + +static int board_id_show(struct seq_file *s, void *data) +{ + struct tn48m_data *priv = s->private; + unsigned int regval; + char *buf; + + regmap_read(priv->regmap, BOARD_ID, ®val); + + switch (regval) { + case BOARD_ID_TN48M: + buf = "TN48M"; + break; + case BOARD_ID_TN48M_P: + buf = "TN48-P"; + break; + default: + buf = "Unknown"; + break; + } + + seq_printf(s, "%s\n", buf); + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(board_id); + +static int code_version_show(struct seq_file *s, void *data) +{ + struct tn48m_data *priv = s->private; + unsigned int regval; + + regmap_read(priv->regmap, CPLD_CODE_VERSION, ®val); + + seq_printf(s, "%d\n", regval); + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(code_version); + +static void tn48m_init_debugfs(struct tn48m_data *data) +{ + data->debugfs_dir = debugfs_create_dir(data->client->name, NULL); + + debugfs_create_file("hardware_version", + 0400, + data->debugfs_dir, + data, + &hardware_version_fops); + + debugfs_create_file("board_id", + 0400, + data->debugfs_dir, + data, + &board_id_fops); + + debugfs_create_file("code_version", + 0400, + data->debugfs_dir, + data, + &code_version_fops); +} + +static int tn48m_probe(struct i2c_client *client) +{ + struct tn48m_data *data; + int ret; + + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + data->dev = &client->dev; + i2c_set_clientdata(client, data); + + data->regmap = devm_regmap_init_i2c(client, &tn48m_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(data->dev, "Failed to allocate regmap\n"); + return PTR_ERR(data->regmap); + } + + ret = devm_mfd_add_devices(data->dev, PLATFORM_DEVID_AUTO, tn48m_cell, + ARRAY_SIZE(tn48m_cell), NULL, 0, NULL); + if (ret) + dev_err(data->dev, "Failed to register sub-devices %d\n", ret); + + tn48m_init_debugfs(data); + + return ret; +} + +static int tn48m_remove(struct i2c_client *client) +{ + struct tn48m_data *data = i2c_get_clientdata(client); + + debugfs_remove_recursive(data->debugfs_dir); + + return 0; +} + +static const struct of_device_id tn48m_of_match[] = { + { .compatible = "delta,tn48m-cpld"}, + { } +}; +MODULE_DEVICE_TABLE(of, tn48m_of_match); + +static struct i2c_driver tn48m_driver = { + .driver = { + .name = "tn48m-cpld", + .of_match_table = tn48m_of_match, + }, + .probe_new = tn48m_probe, + .remove = tn48m_remove, +}; +module_i2c_driver(tn48m_driver); + +MODULE_AUTHOR("Robert Marko "); +MODULE_DESCRIPTION("Delta TN48M CPLD parent driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/tn48m.h b/include/linux/mfd/tn48m.h new file mode 100644 index 000000000000..551c550efa54 --- /dev/null +++ b/include/linux/mfd/tn48m.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2020 Sartura Ltd + */ + +#ifndef __TN48M_H__ +#define __TN48M_H__ + +#include +#include + +#define HARDWARE_VERSION_ID 0x0 +#define HARDWARE_VERSION_MASK GENMASK(3, 0) +#define HARDWARE_VERSION_EVT1 0 +#define HARDWARE_VERSION_EVT2 1 +#define HARDWARE_VERSION_DVT 2 +#define HARDWARE_VERSION_PVT 3 +#define BOARD_ID 0x1 +#define BOARD_ID_TN48M 0xa +#define BOARD_ID_TN48M_P 0xb +#define CPLD_CODE_VERSION 0x2 + +struct tn48m_data { + struct device *dev; + struct regmap *regmap; + struct i2c_client *client; + struct dentry *debugfs_dir; +}; + +#endif