On 02.05.22 18:41, Pali Rohár wrote:
MAX6370 watchdog is available e.g. on Freescale P1/P2 RDB-PC boards.
Signed-off-by: Pali Rohár pali@kernel.org
drivers/watchdog/Kconfig | 7 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/max6370_wdt.c | 119 +++++++++++++++++++++++++++++++++ 3 files changed, 127 insertions(+) create mode 100644 drivers/watchdog/max6370_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index f90f0ca02bce..1801698ac512 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -167,6 +167,13 @@ config WDT_GPIO doc/device-tree-bindings/watchdog/gpio-wdt.txt for information on how to describe the watchdog in device tree.
+config WDT_MAX6370
- bool "MAX6370 watchdog timer support"
- depends on WDT
- select DM_GPIO
- help
Select this to enable max6370 watchdog timer.- config WDT_MPC8xx bool "MPC8xx watchdog timer support" depends on WDT && MPC8xx
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index a35bd559f51b..f999e4126b4f 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o obj-$(CONFIG_WDT_ORION) += orion_wdt.o obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o obj-$(CONFIG_WDT_GPIO) += gpio_wdt.o +obj-$(CONFIG_WDT_MAX6370) += max6370_wdt.o obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o obj-$(CONFIG_WDT_MT7620) += mt7620_wdt.o obj-$(CONFIG_WDT_MT7621) += mt7621_wdt.o diff --git a/drivers/watchdog/max6370_wdt.c b/drivers/watchdog/max6370_wdt.c new file mode 100644 index 000000000000..556c6a4b6d6b --- /dev/null +++ b/drivers/watchdog/max6370_wdt.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0+ +// (C) 2022 Pali Rohár pali@kernel.org
+#include <common.h>
AFAIK, it's not recommended any more to include "common.h" in general.
Looks good, other than this:
Reviewed-by: Stefan Roese sr@denx.de
Thanks, Stefan
+#include <asm/io.h> +#include <asm-generic/gpio.h> +#include <dm.h> +#include <linux/delay.h> +#include <wdt.h>
+#define MAX6370_SET_MASK 0x7 +#define MAX6370_SET_1MS 0x0 +#define MAX6370_SET_10MS 0x1 +#define MAX6370_SET_30MS 0x2 +#define MAX6370_SET_DISABLE 0x3 +#define MAX6370_SET_100MS 0x4 +#define MAX6370_SET_1S 0x5 +#define MAX6370_SET_10S 0x6 +#define MAX6370_SET_60S 0x7
+#define MAX6370_WDI 0x8
+struct max6370_wdt {
- void __iomem *reg;
- struct gpio_desc gpio_wdi;
+};
+static int max6370_wdt_start(struct udevice *dev, u64 ms, ulong flags) +{
- struct max6370_wdt *wdt = dev_get_priv(dev);
- u8 val;
- val = readb(wdt->reg);
- val &= ~MAX6370_SET_MASK;
- if (ms <= 1)
val |= MAX6370_SET_1MS;- else if (ms <= 10)
val |= MAX6370_SET_10MS;- else if (ms <= 30)
val |= MAX6370_SET_30MS;- else if (ms <= 100)
val |= MAX6370_SET_100MS;- else if (ms <= 1000)
val |= MAX6370_SET_1S;- else if (ms <= 10000)
val |= MAX6370_SET_10S;- else
val |= MAX6370_SET_60S;- writeb(val, wdt->reg);
- return 0;
+}
+static int max6370_wdt_stop(struct udevice *dev) +{
- struct max6370_wdt *wdt = dev_get_priv(dev);
- u8 val;
- val = readb(wdt->reg);
- val &= ~MAX6370_SET_MASK;
- val |= MAX6370_SET_DISABLE;
- writeb(val, wdt->reg);
- return 0;
+}
+static int max6370_wdt_reset(struct udevice *dev) +{
- struct max6370_wdt *wdt = dev_get_priv(dev);
- u8 val;
- if (dm_gpio_is_valid(&wdt->gpio_wdi)) {
dm_gpio_set_value(&wdt->gpio_wdi, 1);udelay(1);dm_gpio_set_value(&wdt->gpio_wdi, 0);- } else {
val = readb(wdt->reg);writeb(val | MAX6370_WDI, wdt->reg);writeb(val & ~MAX6370_WDI, wdt->reg);- }
- return 0;
+}
+static int max6370_wdt_probe(struct udevice *dev) +{
- struct max6370_wdt *wdt = dev_get_priv(dev);
- wdt->reg = dev_read_addr_ptr(dev);
- if (!wdt->reg)
return -EINVAL;- /* WDI gpio is optional */
- gpio_request_by_name(dev, "gpios", 0, &wdt->gpio_wdi, GPIOD_IS_OUT);
- return 0;
+}
+static const struct wdt_ops max6370_wdt_ops = {
- .start = max6370_wdt_start,
- .stop = max6370_wdt_stop,
- .reset = max6370_wdt_reset,
+};
+static const struct udevice_id max6370_wdt_ids[] = {
- { .compatible = "maxim,max6370" },
- {}
+};
+U_BOOT_DRIVER(max6370_wdt) = {
- .name = "max6370_wdt",
- .id = UCLASS_WDT,
- .of_match = max6370_wdt_ids,
- .probe = max6370_wdt_probe,
- .priv_auto = sizeof(struct max6370_wdt),
- .ops = &max6370_wdt_ops,
+};
Viele Grüße, Stefan Roese