mfd: smsc-ece1099: Remove driver

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@walle.cc>
Cc: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

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

Documentation/driver-api/smsc_ece1099.rst

-=================================================
-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.

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

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)

drivers/mfd/smsc-ece1099.c

-/*
- * TI SMSC MFD Driver
- *
- * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
- *
- * Author: Sourav Poddar <sourav.poddar@ti.com>
- *
- *  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);

include/linux/mfd/smsc.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * SMSC ECE1099
- *
- * Copyright 2012 Texas Instruments Inc.
- *
- * Author: Sourav Poddar <sourav.poddar@ti.com>
- */
-
-#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 */