[PATCH] mfd: remove smsc-ece1099 MFD driver

From: Michael Walle
Date: Wed Jul 01 2020 - 17:24:09 EST

This MFD driver has no user. The keypad driver of this device never made
it into the kernel. Therefore, this driver is useless. Remove it.

Signed-off-by: Michael Walle <michael@xxxxxxxx>
Cc: Sourav Poddar <sourav.poddar@xxxxxx>
---
Documentation/driver-api/index.rst | 1 -
Documentation/driver-api/smsc_ece1099.rst | 60 -------------
drivers/mfd/Kconfig | 12 ---
drivers/mfd/Makefile | 1 -
drivers/mfd/smsc-ece1099.c | 87 ------------------
include/linux/mfd/smsc.h | 104 ----------------------
6 files changed, 265 deletions(-)
delete mode 100644 Documentation/driver-api/smsc_ece1099.rst
delete mode 100644 drivers/mfd/smsc-ece1099.c
delete mode 100644 include/linux/mfd/smsc.h

diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index 6567187e7687..1397a30188eb 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -98,7 +98,6 @@ available subsections can be seen below.
rfkill
serial/index
sm501
- smsc_ece1099
switchtec
sync_file
vfio-mediated-device
diff --git a/Documentation/driver-api/smsc_ece1099.rst b/Documentation/driver-api/smsc_ece1099.rst
deleted file mode 100644
index 079277421eaf..000000000000
--- a/Documentation/driver-api/smsc_ece1099.rst
+++ /dev/null
@@ -1,60 +0,0 @@
-=================================================
-Msc Keyboard Scan Expansion/GPIO Expansion device
-=================================================
-
-What is smsc-ece1099?
-----------------------
-
-The ECE1099 is a 40-Pin 3.3V Keyboard Scan Expansion
-or GPIO Expansion device. The device supports a keyboard
-scan matrix of 23x8. The device is connected to a Master
-via the SMSC BC-Link interface or via the SMBus.
-Keypad scan Input(KSI) and Keypad Scan Output(KSO) signals
-are multiplexed with GPIOs.
-
-Interrupt generation
---------------------
-
-Interrupts can be generated by an edge detection on a GPIO
-pin or an edge detection on one of the bus interface pins.
-Interrupts can also be detected on the keyboard scan interface.
-The bus interrupt pin (BC_INT# or SMBUS_INT#) is asserted if
-any bit in one of the Interrupt Status registers is 1 and
-the corresponding Interrupt Mask bit is also 1.
-
-In order for software to determine which device is the source
-of an interrupt, it should first read the Group Interrupt Status Register
-to determine which Status register group is a source for the interrupt.
-Software should read both the Status register and the associated Mask register,
-then AND the two values together. Bits that are 1 in the result of the AND
-are active interrupts. Software clears an interrupt by writing a 1 to the
-corresponding bit in the Status register.
-
-Communication Protocol
-----------------------
-
-- SMbus slave Interface
- The host processor communicates with the ECE1099 device
- through a series of read/write registers via the SMBus
- interface. SMBus is a serial communication protocol between
- a computer host and its peripheral devices. The SMBus data
- rate is 10KHz minimum to 400 KHz maximum
-
-- Slave Bus Interface
- The ECE1099 device SMBus implementation is a subset of the
- SMBus interface to the host. The device is a slave-only SMBus device.
- The implementation in the device is a subset of SMBus since it
- only supports four protocols.
-
- The Write Byte, Read Byte, Send Byte, and Receive Byte protocols are the
- only valid SMBus protocols for the device.
-
-- BC-LinkTM Interface
- The BC-Link is a proprietary bus that allows communication
- between a Master device and a Companion device. The Master
- device uses this serial bus to read and write registers
- located on the Companion device. The bus comprises three signals,
- BC_CLK, BC_DAT and BC_INT#. The Master device always provides the
- clock, BC_CLK, and the Companion device is the source for an
- independent asynchronous interrupt signal, BC_INT#. The ECE1099
- supports BC-Link speeds up to 24MHz.
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index be8053d6fa1f..7e72ed3441f1 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1193,18 +1193,6 @@ config MFD_SKY81452
This driver can also be built as a module. If so, the module
will be called sky81452.

-config MFD_SMSC
- bool "SMSC ECE1099 series chips"
- depends on I2C=y
- select MFD_CORE
- select REGMAP_I2C
- help
- If you say yes here you get support for the
- ece1099 chips from SMSC.
-
- To compile this driver as a module, choose M here: the
- module will be called smsc.
-
config MFD_SC27XX_PMIC
tristate "Spreadtrum SC27xx PMICs"
depends on ARCH_SPRD || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 9e6e18336f14..7e26e7f98ac2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -127,7 +127,6 @@ obj-$(CONFIG_MFD_CPCAP) += motorola-cpcap.o
obj-$(CONFIG_MCP) += mcp-core.o
obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o
obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o
-obj-$(CONFIG_MFD_SMSC) += smsc-ece1099.o
obj-$(CONFIG_MCP_UCB1200_TS) += ucb1x00-ts.o

ifeq ($(CONFIG_SA1100_ASSABET),y)
diff --git a/drivers/mfd/smsc-ece1099.c b/drivers/mfd/smsc-ece1099.c
deleted file mode 100644
index 57b792eb58fd..000000000000
--- a/drivers/mfd/smsc-ece1099.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * TI SMSC MFD Driver
- *
- * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
- *
- * Author: Sourav Poddar <sourav.poddar@xxxxxx>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; GPL v2.
- *
- */
-
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/gpio.h>
-#include <linux/workqueue.h>
-#include <linux/irq.h>
-#include <linux/regmap.h>
-#include <linux/err.h>
-#include <linux/mfd/core.h>
-#include <linux/mfd/smsc.h>
-#include <linux/of_platform.h>
-
-static const struct regmap_config smsc_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = SMSC_VEN_ID_H,
- .cache_type = REGCACHE_RBTREE,
-};
-
-static int smsc_i2c_probe(struct i2c_client *i2c,
- const struct i2c_device_id *id)
-{
- struct smsc *smsc;
- int devid, rev, venid_l, venid_h;
- int ret;
-
- smsc = devm_kzalloc(&i2c->dev, sizeof(*smsc), GFP_KERNEL);
- if (!smsc)
- return -ENOMEM;
-
- smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
- if (IS_ERR(smsc->regmap))
- return PTR_ERR(smsc->regmap);
-
- i2c_set_clientdata(i2c, smsc);
- smsc->dev = &i2c->dev;
-
-#ifdef CONFIG_OF
- of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
-#endif
-
- regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
- regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
- regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
- regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
-
- dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
- devid, rev, (venid_h << 8) | venid_l);
-
- ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
- if (ret)
- return ret;
-
-#ifdef CONFIG_OF
- if (i2c->dev.of_node)
- ret = devm_of_platform_populate(&i2c->dev);
-#endif
-
- return ret;
-}
-
-static const struct i2c_device_id smsc_i2c_id[] = {
- { "smscece1099", 0},
- {},
-};
-
-static struct i2c_driver smsc_i2c_driver = {
- .driver = {
- .name = "smsc",
- },
- .probe = smsc_i2c_probe,
- .id_table = smsc_i2c_id,
-};
-builtin_i2c_driver(smsc_i2c_driver);
diff --git a/include/linux/mfd/smsc.h b/include/linux/mfd/smsc.h
deleted file mode 100644
index 83944124e886..000000000000
--- a/include/linux/mfd/smsc.h
+++ /dev/null
@@ -1,104 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * SMSC ECE1099
- *
- * Copyright 2012 Texas Instruments Inc.
- *
- * Author: Sourav Poddar <sourav.poddar@xxxxxx>
- */
-
-#ifndef __LINUX_MFD_SMSC_H
-#define __LINUX_MFD_SMSC_H
-
-#include <linux/regmap.h>
-
-#define SMSC_ID_ECE1099 1
-#define SMSC_NUM_CLIENTS 2
-
-#define SMSC_BASE_ADDR 0x38
-#define OMAP_GPIO_SMSC_IRQ 151
-
-#define SMSC_MAXGPIO 32
-#define SMSC_BANK(offs) ((offs) >> 3)
-#define SMSC_BIT(offs) (1u << ((offs) & 0x7))
-
-struct smsc {
- struct device *dev;
- struct i2c_client *i2c_clients[SMSC_NUM_CLIENTS];
- struct regmap *regmap;
- int clk;
- /* Stored chip id */
- int id;
-};
-
-struct smsc_gpio;
-struct smsc_keypad;
-
-static inline int smsc_read(struct device *child, unsigned int reg,
- unsigned int *dest)
-{
- struct smsc *smsc = dev_get_drvdata(child->parent);
-
- return regmap_read(smsc->regmap, reg, dest);
-}
-
-static inline int smsc_write(struct device *child, unsigned int reg,
- unsigned int value)
-{
- struct smsc *smsc = dev_get_drvdata(child->parent);
-
- return regmap_write(smsc->regmap, reg, value);
-}
-
-/* Registers for SMSC */
-#define SMSC_RESET 0xF5
-#define SMSC_GRP_INT 0xF9
-#define SMSC_CLK_CTRL 0xFA
-#define SMSC_WKUP_CTRL 0xFB
-#define SMSC_DEV_ID 0xFC
-#define SMSC_DEV_REV 0xFD
-#define SMSC_VEN_ID_L 0xFE
-#define SMSC_VEN_ID_H 0xFF
-
-/* CLK VALUE */
-#define SMSC_CLK_VALUE 0x13
-
-/* Registers for function GPIO INPUT */
-#define SMSC_GPIO_DATA_IN_START 0x00
-
-/* Registers for function GPIO OUPUT */
-#define SMSC_GPIO_DATA_OUT_START 0x05
-
-/* Definitions for SMSC GPIO CONFIGURATION REGISTER*/
-#define SMSC_GPIO_INPUT_LOW 0x01
-#define SMSC_GPIO_INPUT_RISING 0x09
-#define SMSC_GPIO_INPUT_FALLING 0x11
-#define SMSC_GPIO_INPUT_BOTH_EDGE 0x19
-#define SMSC_GPIO_OUTPUT_PP 0x21
-#define SMSC_GPIO_OUTPUT_OP 0x31
-
-#define GRP_INT_STAT 0xf9
-#define SMSC_GPI_INT 0x0f
-#define SMSC_CFG_START 0x0A
-
-/* Registers for SMSC GPIO INTERRUPT STATUS REGISTER*/
-#define SMSC_GPIO_INT_STAT_START 0x32
-
-/* Registers for SMSC GPIO INTERRUPT MASK REGISTER*/
-#define SMSC_GPIO_INT_MASK_START 0x37
-
-/* Registers for SMSC function KEYPAD*/
-#define SMSC_KP_OUT 0x40
-#define SMSC_KP_IN 0x41
-#define SMSC_KP_INT_STAT 0x42
-#define SMSC_KP_INT_MASK 0x43
-
-/* Definitions for keypad */
-#define SMSC_KP_KSO 0x70
-#define SMSC_KP_KSI 0x51
-#define SMSC_KSO_ALL_LOW 0x20
-#define SMSC_KP_SET_LOW_PWR 0x0B
-#define SMSC_KP_SET_HIGH 0xFF
-#define SMSC_KSO_EVAL 0x00
-
-#endif /* __LINUX_MFD_SMSC_H */
--
2.20.1