Re: [PATCH 3/5] watchdog: remove zte zx driver

From: Guenter Roeck
Date: Wed Jan 20 2021 - 14:10:00 EST

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On Wed, Jan 20, 2021 at 05:27:43PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The zte zx platform is getting removed, so this driver is no
> longer needed.
>
> Cc: Jun Nie <jun.nie@xxxxxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
> .../bindings/watchdog/zte,zx2967-wdt.txt | 32 --
> drivers/watchdog/Kconfig | 10 -
> drivers/watchdog/Makefile | 1 -
> drivers/watchdog/zx2967_wdt.c | 279 ------------------
> 4 files changed, 322 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt
> delete mode 100644 drivers/watchdog/zx2967_wdt.c
>
> diff --git a/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt b/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt
> deleted file mode 100644
> index 06ce67766756..000000000000
> --- a/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt
> +++ /dev/null
> @@ -1,32 +0,0 @@
> -ZTE zx2967 Watchdog timer
> -
> -Required properties:
> -
> -- compatible : should be one of the following.
> - * zte,zx296718-wdt
> -- reg : Specifies base physical address and size of the registers.
> -- clocks : Pairs of phandle and specifier referencing the controller's clocks.
> -- resets : Reference to the reset controller controlling the watchdog
> - controller.
> -
> -Optional properties:
> -
> -- timeout-sec : Contains the watchdog timeout in seconds.
> -- zte,wdt-reset-sysctrl : Directs how to reset system by the watchdog.
> - if we don't want to restart system when watchdog been triggered,
> - it's not required, vice versa.
> - It should include following fields.
> - * phandle of aon-sysctrl.
> - * offset of register that be written, should be 0xb0.
> - * configure value that be written to aon-sysctrl.
> - * bit mask, corresponding bits will be affected.
> -
> -Example:
> -
> -wdt: watchdog@1465000 {
> - compatible = "zte,zx296718-wdt";
> - reg = <0x1465000 0x1000>;
> - clocks = <&topcrm WDT_WCLK>;
> - resets = <&toprst 35>;
> - zte,wdt-reset-sysctrl = <&aon_sysctrl 0xb0 1 0x115>;
> -};
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 5559e4325f6a..c36f8233f60b 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -919,16 +919,6 @@ config ASPEED_WATCHDOG
> To compile this driver as a module, choose M here: the
> module will be called aspeed_wdt.
>
> -config ZX2967_WATCHDOG
> - tristate "ZTE zx2967 SoCs watchdog support"
> - depends on ARCH_ZX
> - select WATCHDOG_CORE
> - help
> - Say Y here to include support for the watchdog timer
> - in ZTE zx2967 SoCs.
> - To compile this driver as a module, choose M here: the
> - module will be called zx2967_wdt.
> -
> config STM32_WATCHDOG
> tristate "STM32 Independent WatchDoG (IWDG) support"
> depends on ARCH_STM32
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 40b94403c487..7a95b280cd9f 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -86,7 +86,6 @@ obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
> obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o
> obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o
> obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
> -obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
> obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o
> obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
> obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
> diff --git a/drivers/watchdog/zx2967_wdt.c b/drivers/watchdog/zx2967_wdt.c
> deleted file mode 100644
> index bf183e73671a..000000000000
> --- a/drivers/watchdog/zx2967_wdt.c
> +++ /dev/null
> @@ -1,279 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -/*
> - * watchdog driver for ZTE's zx2967 family
> - *
> - * Copyright (C) 2017 ZTE Ltd.
> - *
> - * Author: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
> - */
> -
> -#include <linux/clk.h>
> -#include <linux/io.h>
> -#include <linux/mfd/syscon.h>
> -#include <linux/module.h>
> -#include <linux/of_address.h>
> -#include <linux/platform_device.h>
> -#include <linux/regmap.h>
> -#include <linux/reset.h>
> -#include <linux/watchdog.h>
> -
> -#define ZX2967_WDT_CFG_REG 0x4
> -#define ZX2967_WDT_LOAD_REG 0x8
> -#define ZX2967_WDT_REFRESH_REG 0x18
> -#define ZX2967_WDT_START_REG 0x1c
> -
> -#define ZX2967_WDT_REFRESH_MASK GENMASK(5, 0)
> -
> -#define ZX2967_WDT_CFG_DIV(n) ((((n) & 0xff) - 1) << 8)
> -#define ZX2967_WDT_START_EN 0x1
> -
> -/*
> - * Hardware magic number.
> - * When watchdog reg is written, the lowest 16 bits are valid, but
> - * the highest 16 bits should be always this number.
> - */
> -#define ZX2967_WDT_WRITEKEY (0x1234 << 16)
> -#define ZX2967_WDT_VAL_MASK GENMASK(15, 0)
> -
> -#define ZX2967_WDT_DIV_DEFAULT 16
> -#define ZX2967_WDT_DEFAULT_TIMEOUT 32
> -#define ZX2967_WDT_MIN_TIMEOUT 1
> -#define ZX2967_WDT_MAX_TIMEOUT 524
> -#define ZX2967_WDT_MAX_COUNT 0xffff
> -
> -#define ZX2967_WDT_CLK_FREQ 0x8000
> -
> -#define ZX2967_WDT_FLAG_REBOOT_MON BIT(0)
> -
> -struct zx2967_wdt {
> - struct watchdog_device wdt_device;
> - void __iomem *reg_base;
> - struct clk *clock;
> -};
> -
> -static inline u32 zx2967_wdt_readl(struct zx2967_wdt *wdt, u16 reg)
> -{
> - return readl_relaxed(wdt->reg_base + reg);
> -}
> -
> -static inline void zx2967_wdt_writel(struct zx2967_wdt *wdt, u16 reg, u32 val)
> -{
> - writel_relaxed(val | ZX2967_WDT_WRITEKEY, wdt->reg_base + reg);
> -}
> -
> -static void zx2967_wdt_refresh(struct zx2967_wdt *wdt)
> -{
> - u32 val;
> -
> - val = zx2967_wdt_readl(wdt, ZX2967_WDT_REFRESH_REG);
> - /*
> - * Bit 4-5, 1 and 2: refresh config info
> - * Bit 2-3, 1 and 2: refresh counter
> - * Bit 0-1, 1 and 2: refresh int-value
> - * we shift each group value between 1 and 2 to refresh all data.
> - */
> - val ^= ZX2967_WDT_REFRESH_MASK;
> - zx2967_wdt_writel(wdt, ZX2967_WDT_REFRESH_REG,
> - val & ZX2967_WDT_VAL_MASK);
> -}
> -
> -static int
> -zx2967_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
> -{
> - struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
> - unsigned int divisor = ZX2967_WDT_DIV_DEFAULT;
> - u32 count;
> -
> - count = timeout * ZX2967_WDT_CLK_FREQ;
> - if (count > divisor * ZX2967_WDT_MAX_COUNT)
> - divisor = DIV_ROUND_UP(count, ZX2967_WDT_MAX_COUNT);
> - count = DIV_ROUND_UP(count, divisor);
> - zx2967_wdt_writel(wdt, ZX2967_WDT_CFG_REG,
> - ZX2967_WDT_CFG_DIV(divisor) & ZX2967_WDT_VAL_MASK);
> - zx2967_wdt_writel(wdt, ZX2967_WDT_LOAD_REG,
> - count & ZX2967_WDT_VAL_MASK);
> - zx2967_wdt_refresh(wdt);
> - wdd->timeout = (count * divisor) / ZX2967_WDT_CLK_FREQ;
> -
> - return 0;
> -}
> -
> -static void __zx2967_wdt_start(struct zx2967_wdt *wdt)
> -{
> - u32 val;
> -
> - val = zx2967_wdt_readl(wdt, ZX2967_WDT_START_REG);
> - val |= ZX2967_WDT_START_EN;
> - zx2967_wdt_writel(wdt, ZX2967_WDT_START_REG,
> - val & ZX2967_WDT_VAL_MASK);
> -}
> -
> -static void __zx2967_wdt_stop(struct zx2967_wdt *wdt)
> -{
> - u32 val;
> -
> - val = zx2967_wdt_readl(wdt, ZX2967_WDT_START_REG);
> - val &= ~ZX2967_WDT_START_EN;
> - zx2967_wdt_writel(wdt, ZX2967_WDT_START_REG,
> - val & ZX2967_WDT_VAL_MASK);
> -}
> -
> -static int zx2967_wdt_start(struct watchdog_device *wdd)
> -{
> - struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
> -
> - zx2967_wdt_set_timeout(wdd, wdd->timeout);
> - __zx2967_wdt_start(wdt);
> -
> - return 0;
> -}
> -
> -static int zx2967_wdt_stop(struct watchdog_device *wdd)
> -{
> - struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
> -
> - __zx2967_wdt_stop(wdt);
> -
> - return 0;
> -}
> -
> -static int zx2967_wdt_keepalive(struct watchdog_device *wdd)
> -{
> - struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
> -
> - zx2967_wdt_refresh(wdt);
> -
> - return 0;
> -}
> -
> -#define ZX2967_WDT_OPTIONS \
> - (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
> -static const struct watchdog_info zx2967_wdt_ident = {
> - .options = ZX2967_WDT_OPTIONS,
> - .identity = "zx2967 watchdog",
> -};
> -
> -static const struct watchdog_ops zx2967_wdt_ops = {
> - .owner = THIS_MODULE,
> - .start = zx2967_wdt_start,
> - .stop = zx2967_wdt_stop,
> - .ping = zx2967_wdt_keepalive,
> - .set_timeout = zx2967_wdt_set_timeout,
> -};
> -
> -static void zx2967_wdt_reset_sysctrl(struct device *dev)
> -{
> - int ret;
> - void __iomem *regmap;
> - unsigned int offset, mask, config;
> - struct of_phandle_args out_args;
> -
> - ret = of_parse_phandle_with_fixed_args(dev->of_node,
> - "zte,wdt-reset-sysctrl", 3, 0, &out_args);
> - if (ret)
> - return;
> -
> - offset = out_args.args[0];
> - config = out_args.args[1];
> - mask = out_args.args[2];
> -
> - regmap = syscon_node_to_regmap(out_args.np);
> - if (IS_ERR(regmap)) {
> - of_node_put(out_args.np);
> - return;
> - }
> -
> - regmap_update_bits(regmap, offset, mask, config);
> - of_node_put(out_args.np);
> -}
> -
> -static void zx2967_clk_disable_unprepare(void *data)
> -{
> - clk_disable_unprepare(data);
> -}
> -
> -static int zx2967_wdt_probe(struct platform_device *pdev)
> -{
> - struct device *dev = &pdev->dev;
> - struct zx2967_wdt *wdt;
> - int ret;
> - struct reset_control *rstc;
> -
> - wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
> - if (!wdt)
> - return -ENOMEM;
> -
> - platform_set_drvdata(pdev, wdt);
> -
> - wdt->wdt_device.info = &zx2967_wdt_ident;
> - wdt->wdt_device.ops = &zx2967_wdt_ops;
> - wdt->wdt_device.timeout = ZX2967_WDT_DEFAULT_TIMEOUT;
> - wdt->wdt_device.max_timeout = ZX2967_WDT_MAX_TIMEOUT;
> - wdt->wdt_device.min_timeout = ZX2967_WDT_MIN_TIMEOUT;
> - wdt->wdt_device.parent = dev;
> -
> - wdt->reg_base = devm_platform_ioremap_resource(pdev, 0);
> - if (IS_ERR(wdt->reg_base))
> - return PTR_ERR(wdt->reg_base);
> -
> - zx2967_wdt_reset_sysctrl(dev);
> -
> - wdt->clock = devm_clk_get(dev, NULL);
> - if (IS_ERR(wdt->clock)) {
> - dev_err(dev, "failed to find watchdog clock source\n");
> - return PTR_ERR(wdt->clock);
> - }
> -
> - ret = clk_prepare_enable(wdt->clock);
> - if (ret < 0) {
> - dev_err(dev, "failed to enable clock\n");
> - return ret;
> - }
> - ret = devm_add_action_or_reset(dev, zx2967_clk_disable_unprepare,
> - wdt->clock);
> - if (ret)
> - return ret;
> - clk_set_rate(wdt->clock, ZX2967_WDT_CLK_FREQ);
> -
> - rstc = devm_reset_control_get_exclusive(dev, NULL);
> - if (IS_ERR(rstc)) {
> - dev_err(dev, "failed to get rstc");
> - return PTR_ERR(rstc);
> - }
> -
> - reset_control_assert(rstc);
> - reset_control_deassert(rstc);
> -
> - watchdog_set_drvdata(&wdt->wdt_device, wdt);
> - watchdog_init_timeout(&wdt->wdt_device,
> - ZX2967_WDT_DEFAULT_TIMEOUT, dev);
> - watchdog_set_nowayout(&wdt->wdt_device, WATCHDOG_NOWAYOUT);
> -
> - ret = devm_watchdog_register_device(dev, &wdt->wdt_device);
> - if (ret)
> - return ret;
> -
> - dev_info(dev, "watchdog enabled (timeout=%d sec, nowayout=%d)",
> - wdt->wdt_device.timeout, WATCHDOG_NOWAYOUT);
> -
> - return 0;
> -}
> -
> -static const struct of_device_id zx2967_wdt_match[] = {
> - { .compatible = "zte,zx296718-wdt", },
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, zx2967_wdt_match);
> -
> -static struct platform_driver zx2967_wdt_driver = {
> - .probe = zx2967_wdt_probe,
> - .driver = {
> - .name = "zx2967-wdt",
> - .of_match_table = of_match_ptr(zx2967_wdt_match),
> - },
> -};
> -module_platform_driver(zx2967_wdt_driver);
> -
> -MODULE_AUTHOR("Baoyou Xie <baoyou.xie@xxxxxxxxxx>");
> -MODULE_DESCRIPTION("ZTE zx2967 Watchdog Device Driver");
> -MODULE_LICENSE("GPL v2");
> --
> 2.29.2
>

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