drivers/watchdog/CMakeLists.txt

@@ -45,7 +45,6 @@ zephyr_library_sources_ifdef(CONFIG_WDT_AMBIQ wdt_ambiq.c)
 zephyr_library_sources_ifdef(CONFIG_WDT_XMC4XXX wdt_xmc4xxx.c)
 zephyr_library_sources_ifdef(CONFIG_WWDT_NUMAKER wdt_wwdt_numaker.c)
 zephyr_library_sources_ifdef(CONFIG_WDT_ENE_KB1200 wdt_ene_kb1200.c)
-zephyr_library_sources_ifdef(CONFIG_WDT_IWDG_CH32V00X wdt_iwdg_ch32v00x.c)
 
 zephyr_library_sources_ifdef(CONFIG_WDT_DW wdt_dw.c wdt_dw_common.c)
 zephyr_library_sources_ifdef(CONFIG_WDT_INTEL_ADSP wdt_intel_adsp.c wdt_dw_common.c)

drivers/watchdog/Kconfig

@@ -134,6 +134,4 @@ source "drivers/watchdog/Kconfig.ene"
 
 source "drivers/watchdog/Kconfig.litex"
 
-source "drivers/watchdog/Kconfig.ch32v00x"
-
 endif # WATCHDOG

drivers/watchdog/Kconfig.ch32v00x

@@ -1,9 +0,0 @@
-# Copyright (c) 2024 Google LLC.
-# SPDX-License-Identifier: Apache-2.0
-
-config WDT_IWDG_CH32V00X
-	bool "CH32V00x Independent Watchdog (IWDG) driver"
-	default y
-	depends on DT_HAS_WCH_IWDG_ENABLED
-	help
-	  Enable the Independent Watchdog (IWDG) driver for CH32V00x SOCs.

drivers/watchdog/wdt_iwdg_ch32v00x.c

@@ -1,92 +0,0 @@
-/*
- * Copyright (c) 2024 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#define DT_DRV_COMPAT wch_iwdg
-
-#include <zephyr/drivers/watchdog.h>
-#include <zephyr/kernel.h>
-#include <zephyr/sys_clock.h>
-#include <errno.h>
-
-#include <ch32_iwdg.h>
-
-static int iwdg_ch32v00x_setup(const struct device *dev, uint8_t options)
-{
-	if (options != 0) {
-		return -ENOTSUP;
-	}
-
-	IWDG->CTLR = CTLR_KEY_Enable;
-
-	return 0;
-}
-
-static int iwdg_ch32v00x_disable(const struct device *dev)
-{
-	return -EPERM;
-}
-
-static int iwdg_ch32v00x_install_timeout(const struct device *dev,
-					 const struct wdt_timeout_cfg *config)
-{
-	/* The IWDT is driven by the 128 kHz LSI oscillator with at least a /4 prescaler. */
-	int prescaler = 0;
-	uint32_t reload = config->window.max * (128 / 4);
-
-	if (config->callback != NULL) {
-		return -ENOTSUP;
-	}
-	if (config->window.min != 0) {
-		return -ENOTSUP;
-	}
-	if ((config->flags & WDT_FLAG_RESET_MASK) != WDT_FLAG_RESET_CPU_CORE) {
-		return -ENOTSUP;
-	}
-
-	for (; reload > IWDG_RL && prescaler < IWDG_PR;) {
-		prescaler++;
-		reload /= 2;
-	}
-	/* The highest prescaler is effectively invalid. Use that to detect a too long timeout. */
-	if (prescaler == IWDG_PR) {
-		return -EINVAL;
-	}
-
-	/* Wait for the watchdog to be idle, unlock it, update, and wait for idle. */
-	while ((IWDG->STATR & (IWDG_RVU | IWDG_PVU)) != 0) {
-	}
-
-	IWDG->CTLR = IWDG_WriteAccess_Enable;
-	IWDG->PSCR = prescaler;
-	IWDG->RLDR = reload;
-
-	while ((IWDG->STATR & (IWDG_RVU | IWDG_PVU)) != 0) {
-	}
-
-	return 0;
-}
-
-static int iwdg_ch32v00x_feed(const struct device *dev, int channel_id)
-{
-	IWDG->CTLR = CTLR_KEY_Reload;
-
-	return 0;
-}
-
-static const struct wdt_driver_api iwdg_ch32v00x_api = {
-	.setup = iwdg_ch32v00x_setup,
-	.disable = iwdg_ch32v00x_disable,
-	.install_timeout = iwdg_ch32v00x_install_timeout,
-	.feed = iwdg_ch32v00x_feed,
-};
-
-static int iwdg_ch32v00x_init(const struct device *dev)
-{
-	return 0;
-}
-
-DEVICE_DT_INST_DEFINE(0, iwdg_ch32v00x_init, NULL, NULL, NULL, PRE_KERNEL_1,
-		      CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &iwdg_ch32v00x_api);

dts/bindings/watchdog/wch,iwdg.yaml

@@ -1,12 +0,0 @@
-# Copyright (c) 2024 Google LLC.
-# SPDX-License-Identifier: Apache-2.0
-
-description: CH32V00x Independent Watchdog (IWDG)
-
-compatible: "wch,iwdg"
-
-include: base.yaml
-
-properties:
-  reg:
-    required: true

dts/riscv/wch/ch32v00x.dtsi

@@ -94,11 +94,6 @@
 			interrupts = <12>;
 		};
 
-		iwdg: watchdog@40003000 {
-			compatible = "wch,iwdg";
-			reg = <0x40003000 16>;
-		};
-
 		pwr: pwr@40007000 {
 			compatible = "wch,pwr";
 			reg = <0x40007000 16>;

modules/hal_wch/ch32_iwdg.h

@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2024 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#ifndef _CH32_IWDG_H
-#define _CH32_IWDG_H
-
-#ifdef CONFIG_SOC_CH32V003
-#include <ch32v003fun.h>
-#else
-#error "SoC not supported!"
-#endif
-
-#endif

samples/drivers/watchdog/boards/ch32v003evt.overlay

@@ -1,15 +0,0 @@
-/*
- * Copyright (c) 2024 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-/ {
-	aliases {
-		watchdog0 = &iwdg;
-	};
-};
-
-&iwdg {
-	status = "okay";
-};