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Message-Id: <20180710151915.2282622-2-arnd@arndb.de>
Date: Tue, 10 Jul 2018 17:18:48 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Linus Walleij <linus.walleij@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Sergio Paracuellos <sergio.paracuellos@...il.com>,
Arnd Bergmann <arnd@...db.de>,
Matthias Brugger <matthias.bgg@...il.com>,
NeilBrown <neil@...wn.name>, John Crispin <blogic@...nwrt.org>,
linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH 2/2] staging: mt7621-gpio: remove driver
The gpio-mt7621 driver has graduated out of staging and got accepted
into the gpio tree. Since they both use the same Kconfig symbol,
we could run into conflicts, e.g. I got this failure when the staging
driver got enabled with the other one being unavailable but using the
same Kconfig symbol:
drivers/gpio/gpio-mt7621.c: In function 'mediatek_gpio_bank_probe':
drivers/gpio/gpio-mt7621.c:228:10: error: 'struct gpio_chip' has no member named 'of_node'
rg->chip.of_node = node;
^
drivers/gpio/gpio-mt7621.c:243:10: error: 'struct gpio_chip' has no member named 'of_gpio_n_cells'
rg->chip.of_gpio_n_cells = 2;
^
drivers/gpio/gpio-mt7621.c:244:10: error: 'struct gpio_chip' has no member named 'of_xlate'
rg->chip.of_xlate = mediatek_gpio_xlate;
It would be trivial to rename the Kconfig symbol to avoid that problem,
but there is also seems to be little value in keeping the staging driver
around now.
Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
drivers/staging/Kconfig | 2 -
drivers/staging/Makefile | 1 -
drivers/staging/mt7621-gpio/Kconfig | 8 -
drivers/staging/mt7621-gpio/Makefile | 3 -
drivers/staging/mt7621-gpio/TODO | 3 -
drivers/staging/mt7621-gpio/gpio-mt7621.c | 331 ---------------------
.../staging/mt7621-gpio/mediatek,mt7621-gpio.txt | 35 ---
7 files changed, 383 deletions(-)
delete mode 100644 drivers/staging/mt7621-gpio/Kconfig
delete mode 100644 drivers/staging/mt7621-gpio/Makefile
delete mode 100644 drivers/staging/mt7621-gpio/TODO
delete mode 100644 drivers/staging/mt7621-gpio/gpio-mt7621.c
delete mode 100644 drivers/staging/mt7621-gpio/mediatek,mt7621-gpio.txt
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 9339af2fb51e..bbb0232c7f8e 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -110,8 +110,6 @@ source "drivers/staging/pi433/Kconfig"
source "drivers/staging/mt7621-pinctrl/Kconfig"
-source "drivers/staging/mt7621-gpio/Kconfig"
-
source "drivers/staging/mt7621-spi/Kconfig"
source "drivers/staging/mt7621-dma/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index aa40b1f4cea4..9b381e037e54 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -46,7 +46,6 @@ obj-$(CONFIG_DRM_VBOXVIDEO) += vboxvideo/
obj-$(CONFIG_PI433) += pi433/
obj-$(CONFIG_SOC_MT7621) += mt7621-pci/
obj-$(CONFIG_SOC_MT7621) += mt7621-pinctrl/
-obj-$(CONFIG_SOC_MT7621) += mt7621-gpio/
obj-$(CONFIG_SOC_MT7621) += mt7621-spi/
obj-$(CONFIG_SOC_MT7621) += mt7621-dma/
obj-$(CONFIG_SOC_MT7621) += mt7621-mmc/
diff --git a/drivers/staging/mt7621-gpio/Kconfig b/drivers/staging/mt7621-gpio/Kconfig
deleted file mode 100644
index 5485dd2d9b61..000000000000
--- a/drivers/staging/mt7621-gpio/Kconfig
+++ /dev/null
@@ -1,8 +0,0 @@
-config GPIO_MT7621
- bool "Mediatek MT7621 GPIO Support"
- depends on SOC_MT7620 || SOC_MT7621 || COMPILE_TEST
- select GPIO_GENERIC
- select GPIOLIB_IRQCHIP
- select ARCH_REQUIRE_GPIOLIB
- help
- Say yes here to support the Mediatek MT7621 SoC GPIO device
diff --git a/drivers/staging/mt7621-gpio/Makefile b/drivers/staging/mt7621-gpio/Makefile
deleted file mode 100644
index e269ab1b8717..000000000000
--- a/drivers/staging/mt7621-gpio/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o
-
-ccflags-y += -I$(srctree)/$(src)/include
diff --git a/drivers/staging/mt7621-gpio/TODO b/drivers/staging/mt7621-gpio/TODO
deleted file mode 100644
index 674930a10716..000000000000
--- a/drivers/staging/mt7621-gpio/TODO
+++ /dev/null
@@ -1,3 +0,0 @@
-- general code review and clean up
-
-Cc: NeilBrown <neil@...wn.name>
diff --git a/drivers/staging/mt7621-gpio/gpio-mt7621.c b/drivers/staging/mt7621-gpio/gpio-mt7621.c
deleted file mode 100644
index d7256b56e621..000000000000
--- a/drivers/staging/mt7621-gpio/gpio-mt7621.c
+++ /dev/null
@@ -1,331 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2009-2011 Gabor Juhos <juhosg@...nwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@...nwrt.org>
- */
-
-#include <linux/err.h>
-#include <linux/gpio/driver.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of_irq.h>
-#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-
-#define MTK_BANK_CNT 3
-#define MTK_BANK_WIDTH 32
-
-#define GPIO_BANK_WIDE 0x04
-#define GPIO_REG_CTRL 0x00
-#define GPIO_REG_POL 0x10
-#define GPIO_REG_DATA 0x20
-#define GPIO_REG_DSET 0x30
-#define GPIO_REG_DCLR 0x40
-#define GPIO_REG_REDGE 0x50
-#define GPIO_REG_FEDGE 0x60
-#define GPIO_REG_HLVL 0x70
-#define GPIO_REG_LLVL 0x80
-#define GPIO_REG_STAT 0x90
-#define GPIO_REG_EDGE 0xA0
-
-struct mtk_gc {
- struct gpio_chip chip;
- spinlock_t lock;
- int bank;
- u32 rising;
- u32 falling;
- u32 hlevel;
- u32 llevel;
-};
-
-/**
- * struct mtk_data - state container for
- * data of the platform driver. It is 3
- * separate gpio-chip each one with its
- * own irq_chip.
- * @dev: device instance
- * @gpio_membase: memory base address
- * @gpio_irq: irq number from the device tree
- * @gc_map: array of the gpio chips
- */
-struct mtk_data {
- struct device *dev;
- void __iomem *gpio_membase;
- int gpio_irq;
- struct mtk_gc gc_map[MTK_BANK_CNT];
-};
-
-static inline struct mtk_gc *
-to_mediatek_gpio(struct gpio_chip *chip)
-{
- return container_of(chip, struct mtk_gc, chip);
-}
-
-static inline void
-mtk_gpio_w32(struct mtk_gc *rg, u32 offset, u32 val)
-{
- struct gpio_chip *gc = &rg->chip;
- struct mtk_data *gpio_data = gpiochip_get_data(gc);
-
- offset = (rg->bank * GPIO_BANK_WIDE) + offset;
- gc->write_reg(gpio_data->gpio_membase + offset, val);
-}
-
-static inline u32
-mtk_gpio_r32(struct mtk_gc *rg, u32 offset)
-{
- struct gpio_chip *gc = &rg->chip;
- struct mtk_data *gpio_data = gpiochip_get_data(gc);
-
- offset = (rg->bank * GPIO_BANK_WIDE) + offset;
- return gc->read_reg(gpio_data->gpio_membase + offset);
-}
-
-static irqreturn_t
-mediatek_gpio_irq_handler(int irq, void *data)
-{
- struct gpio_chip *gc = data;
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- irqreturn_t ret = IRQ_NONE;
- unsigned long pending;
- int bit;
-
- pending = mtk_gpio_r32(rg, GPIO_REG_STAT);
-
- for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
- u32 map = irq_find_mapping(gc->irq.domain, bit);
-
- generic_handle_irq(map);
- mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
- ret |= IRQ_HANDLED;
- }
-
- return ret;
-}
-
-static void
-mediatek_gpio_irq_unmask(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- int pin = d->hwirq;
- unsigned long flags;
- u32 rise, fall, high, low;
-
- spin_lock_irqsave(&rg->lock, flags);
- rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
- fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
- high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
- low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
- mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(pin) & rg->rising));
- mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(pin) & rg->falling));
- mtk_gpio_w32(rg, GPIO_REG_HLVL, high | (BIT(pin) & rg->hlevel));
- mtk_gpio_w32(rg, GPIO_REG_LLVL, low | (BIT(pin) & rg->llevel));
- spin_unlock_irqrestore(&rg->lock, flags);
-}
-
-static void
-mediatek_gpio_irq_mask(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- int pin = d->hwirq;
- unsigned long flags;
- u32 rise, fall, high, low;
-
- spin_lock_irqsave(&rg->lock, flags);
- rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
- fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
- high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
- low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
- mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(pin));
- mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(pin));
- mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
- mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
- spin_unlock_irqrestore(&rg->lock, flags);
-}
-
-static int
-mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- int pin = d->hwirq;
- u32 mask = BIT(pin);
-
- if (type == IRQ_TYPE_PROBE) {
- if ((rg->rising | rg->falling |
- rg->hlevel | rg->llevel) & mask)
- return 0;
-
- type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
- }
-
- rg->rising &= ~mask;
- rg->falling &= ~mask;
- rg->hlevel &= ~mask;
- rg->llevel &= ~mask;
-
- switch (type & IRQ_TYPE_SENSE_MASK) {
- case IRQ_TYPE_EDGE_BOTH:
- rg->rising |= mask;
- rg->falling |= mask;
- break;
- case IRQ_TYPE_EDGE_RISING:
- rg->rising |= mask;
- break;
- case IRQ_TYPE_EDGE_FALLING:
- rg->falling |= mask;
- break;
- case IRQ_TYPE_LEVEL_HIGH:
- rg->hlevel |= mask;
- break;
- case IRQ_TYPE_LEVEL_LOW:
- rg->llevel |= mask;
- break;
- }
-
- return 0;
-}
-
-static struct irq_chip mediatek_gpio_irq_chip = {
- .irq_unmask = mediatek_gpio_irq_unmask,
- .irq_mask = mediatek_gpio_irq_mask,
- .irq_mask_ack = mediatek_gpio_irq_mask,
- .irq_set_type = mediatek_gpio_irq_type,
-};
-
-static int
-mediatek_gpio_xlate(struct gpio_chip *chip,
- const struct of_phandle_args *spec, u32 *flags)
-{
- int gpio = spec->args[0];
- struct mtk_gc *rg = to_mediatek_gpio(chip);
-
- if (rg->bank != gpio / MTK_BANK_WIDTH)
- return -EINVAL;
-
- if (flags)
- *flags = spec->args[1];
-
- return gpio % MTK_BANK_WIDTH;
-}
-
-static int
-mediatek_gpio_bank_probe(struct platform_device *pdev,
- struct device_node *node, int bank)
-{
- struct mtk_data *gpio = dev_get_drvdata(&pdev->dev);
- struct mtk_gc *rg;
- void __iomem *dat, *set, *ctrl, *diro;
- int ret;
-
- rg = &gpio->gc_map[bank];
- memset(rg, 0, sizeof(*rg));
-
- spin_lock_init(&rg->lock);
- rg->chip.of_node = node;
- rg->bank = bank;
-
- dat = gpio->gpio_membase + GPIO_REG_DATA + (rg->bank * GPIO_BANK_WIDE);
- set = gpio->gpio_membase + GPIO_REG_DSET + (rg->bank * GPIO_BANK_WIDE);
- ctrl = gpio->gpio_membase + GPIO_REG_DCLR + (rg->bank * GPIO_BANK_WIDE);
- diro = gpio->gpio_membase + GPIO_REG_CTRL + (rg->bank * GPIO_BANK_WIDE);
-
- ret = bgpio_init(&rg->chip, &pdev->dev, 4,
- dat, set, ctrl, diro, NULL, 0);
- if (ret) {
- dev_err(&pdev->dev, "bgpio_init() failed\n");
- return ret;
- }
-
- rg->chip.of_gpio_n_cells = 2;
- rg->chip.of_xlate = mediatek_gpio_xlate;
- rg->chip.label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-bank%d",
- dev_name(&pdev->dev), bank);
-
- ret = devm_gpiochip_add_data(&pdev->dev, &rg->chip, gpio);
- if (ret < 0) {
- dev_err(&pdev->dev, "Could not register gpio %d, ret=%d\n",
- rg->chip.ngpio, ret);
- return ret;
- }
-
- if (gpio->gpio_irq) {
- /*
- * Manually request the irq here instead of passing
- * a flow-handler to gpiochip_set_chained_irqchip,
- * because the irq is shared.
- */
- ret = devm_request_irq(&pdev->dev, gpio->gpio_irq,
- mediatek_gpio_irq_handler, IRQF_SHARED,
- rg->chip.label, &rg->chip);
-
- if (ret) {
- dev_err(&pdev->dev, "Error requesting IRQ %d: %d\n",
- gpio->gpio_irq, ret);
- return ret;
- }
-
- ret = gpiochip_irqchip_add(&rg->chip, &mediatek_gpio_irq_chip,
- 0, handle_simple_irq, IRQ_TYPE_NONE);
- if (ret) {
- dev_err(&pdev->dev, "failed to add gpiochip_irqchip\n");
- return ret;
- }
-
- gpiochip_set_chained_irqchip(&rg->chip, &mediatek_gpio_irq_chip,
- gpio->gpio_irq, NULL);
- }
-
- /* set polarity to low for all gpios */
- mtk_gpio_w32(rg, GPIO_REG_POL, 0);
-
- dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio);
-
- return 0;
-}
-
-static int
-mediatek_gpio_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct mtk_data *gpio_data;
- int i;
-
- gpio_data = devm_kzalloc(&pdev->dev, sizeof(*gpio_data), GFP_KERNEL);
- if (!gpio_data)
- return -ENOMEM;
-
- gpio_data->gpio_membase = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(gpio_data->gpio_membase))
- return PTR_ERR(gpio_data->gpio_membase);
-
- gpio_data->gpio_irq = irq_of_parse_and_map(np, 0);
- gpio_data->dev = &pdev->dev;
- platform_set_drvdata(pdev, gpio_data);
- mediatek_gpio_irq_chip.name = dev_name(&pdev->dev);
-
- for (i = 0; i < MTK_BANK_CNT; i++)
- mediatek_gpio_bank_probe(pdev, np, i);
-
- return 0;
-}
-
-static const struct of_device_id mediatek_gpio_match[] = {
- { .compatible = "mediatek,mt7621-gpio" },
- {},
-};
-MODULE_DEVICE_TABLE(of, mediatek_gpio_match);
-
-static struct platform_driver mediatek_gpio_driver = {
- .probe = mediatek_gpio_probe,
- .driver = {
- .name = "mt7621_gpio",
- .of_match_table = mediatek_gpio_match,
- },
-};
-
-builtin_platform_driver(mediatek_gpio_driver);
diff --git a/drivers/staging/mt7621-gpio/mediatek,mt7621-gpio.txt b/drivers/staging/mt7621-gpio/mediatek,mt7621-gpio.txt
deleted file mode 100644
index ba455589f869..000000000000
--- a/drivers/staging/mt7621-gpio/mediatek,mt7621-gpio.txt
+++ /dev/null
@@ -1,35 +0,0 @@
-Mediatek MT7621 SoC GPIO controller bindings
-
-The IP core used inside these SoCs has 3 banks of 32 GPIOs each.
-The registers of all the banks are interwoven inside one single IO range.
-We load one GPIO controller instance per bank. Also the GPIO controller can receive
-interrupts on any of the GPIOs, either edge or level. It then interrupts the CPU
-using GIC INT12.
-
-Required properties for the top level node:
-- #gpio-cells : Should be two. The first cell is the GPIO pin number and the
- second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
- Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
-- #interrupt-cells : Specifies the number of cells needed to encode an
- interrupt. Should be 2. The first cell defines the interrupt number,
- the second encodes the triger flags encoded as described in
- Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-- compatible:
- - "mediatek,mt7621-gpio" for Mediatek controllers
-- reg : Physical base address and length of the controller's registers
-- interrupt-parent : phandle of the parent interrupt controller.
-- interrupts : Interrupt specifier for the controllers interrupt.
-- interrupt-controller : Mark the device node as an interrupt controller.
-- gpio-controller : Marks the device node as a GPIO controller.
-
-Example:
- gpio@600 {
- #gpio-cells = <2>;
- #interrupt-cells = <2>;
- compatible = "mediatek,mt7621-gpio";
- gpio-controller;
- interrupt-controller;
- reg = <0x600 0x100>;
- interrupt-parent = <&gic>;
- interrupts = <GIC_SHARED 12 IRQ_TYPE_LEVEL_HIGH>;
- };
--
2.9.0
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