[PATCH v2 1/1] wdt: nuvoton: Add support for Nuvoton

[Stefan Roese]

On 3/9/22 07:13, jimliu2 wrote:
> Add watchdog controller driver for NPCM7xx/npcm8xx
> 
> Signed-off-by: jimliu2 <JJLIU0 at nuvoton.com>

So what did you change in v2? Please add a changelog next time, as
described here:

http://www.denx.de/wiki/view/U-Boot/Patches#Sending_updated_patch_versions

Also there is no need to send a single patch in a patch-series.

Some minor comments below...

> ---
>   drivers/watchdog/Kconfig    |   6 ++
>   drivers/watchdog/Makefile   |   1 +
>   drivers/watchdog/npcm_wdt.c | 119 ++++++++++++++++++++++++++++++++++++
>   3 files changed, 126 insertions(+)
>   create mode 100644 drivers/watchdog/npcm_wdt.c
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index f90f0ca02b..15edcf570f 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -196,6 +196,12 @@ config WDT_MTK
>   	  The watchdog timer is stopped when initialized.
>   	  It performs full SoC reset.
>   
> +config WDT_NPCM
> +	bool "Nuvoton watchdog timer support"
> +	depends on WDT && ARCH_NPCM
> +	help
> +	  Nuvoton npcm7xx/npcm8xx watchdog.
> +
>   config WDT_OCTEONTX
>   	bool "OcteonTX core watchdog support"
>   	depends on WDT && (ARCH_OCTEONTX || ARCH_OCTEONTX2)
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index a35bd559f5..1089cd21f5 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o
>   obj-$(CONFIG_WDT_MT7620) += mt7620_wdt.o
>   obj-$(CONFIG_WDT_MT7621) += mt7621_wdt.o
>   obj-$(CONFIG_WDT_MTK) += mtk_wdt.o
> +obj-$(CONFIG_WDT_NPCM) += npcm_wdt.o
>   obj-$(CONFIG_WDT_OCTEONTX) += octeontx_wdt.o
>   obj-$(CONFIG_WDT_OMAP3) += omap_wdt.o
>   obj-$(CONFIG_WDT_SBSA) += sbsa_gwdt.o
> diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c
> new file mode 100644
> index 0000000000..6abc146d99
> --- /dev/null
> +++ b/drivers/watchdog/npcm_wdt.c
> @@ -0,0 +1,119 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2022 Nuvoton Technology, Inc
> + */
> +
> +#include <common.h>

Including common.h is not deprecated. Please remove in the next version.

> +#include <dm.h>
> +#include <errno.h>
> +#include <log.h>
> +#include <wdt.h>
> +#include <asm/io.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +
> +#define NPCM_WTCLK	(BIT(10) | BIT(11))	/* Clock divider */
> +#define NPCM_WTE	BIT(7)			/* Enable */
> +#define NPCM_WTIE	BIT(6)			/* Enable irq */
> +#define NPCM_WTIS	(BIT(4) | BIT(5))	/* Interval selection */
> +#define NPCM_WTIF	BIT(3)			/* Interrupt flag*/
> +#define NPCM_WTRF	BIT(2)			/* Reset flag */
> +#define NPCM_WTRE	BIT(1)			/* Reset enable */
> +#define NPCM_WTR	BIT(0)			/* Reset counter */
> +
> +struct npcm_wdt_priv {
> +	void __iomem *regs;
> +};
> +
> +static int npcm_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
> +{
> +	struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +	u32 time_out, val;
> +
> +	time_out = (u32)(timeout_ms) / 1000;
> +	if (time_out < 2)
> +		val = 0x800;
> +	else if (time_out < 3)
> +		val = 0x420;
> +	else if (time_out < 6)
> +		val = 0x810;
> +	else if (time_out < 11)
> +		val = 0x430;
> +	else if (time_out < 22)
> +		val = 0x820;
> +	else if (time_out < 44)
> +		val = 0xC00;
> +	else if (time_out < 87)
> +		val = 0x830;
> +	else if (time_out < 173)
> +		val = 0xC10;
> +	else if (time_out < 688)
> +		val = 0xC20;
> +	else
> +		val = 0xC30;
> +
> +	val |= NPCM_WTRE | NPCM_WTE | NPCM_WTR | NPCM_WTIE;
> +	writel(val, priv->regs);
> +
> +	return 0;
> +}
> +
> +static int npcm_wdt_stop(struct udevice *dev)
> +{
> +	struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +
> +	writel(0, priv->regs);
> +
> +	return 0;
> +}
> +
> +static int npcm_wdt_reset(struct udevice *dev)
> +{
> +	struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +
> +	writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, priv->regs);
> +	udelay(1000);
> +
> +	return 0;
> +}
> +
> +static int npcm_wdt_of_to_plat(struct udevice *dev)
> +{
> +	struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +
> +	priv->regs = dev_read_addr_ptr(dev);
> +	if (!priv->regs)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static const struct wdt_ops npcm_wdt_ops = {
> +	.start = npcm_wdt_start,
> +	.reset = npcm_wdt_reset,
> +	.stop = npcm_wdt_stop,
> +};
> +
> +static const struct udevice_id npcm_wdt_ids[] = {
> +	{ .compatible = "nuvoton,npcm750-wdt" },
> +	{ .compatible = "nuvoton,npcm845-wdt" },
> +	{ }
> +};
> +
> +static int npcm_wdt_probe(struct udevice *dev)
> +{
> +	debug("%s() wdt%u\n", __func__, dev_seq(dev));
> +	npcm_wdt_stop(dev);
> +
> +	return 0;
> +}
> +
> +U_BOOT_DRIVER(npcm_wdt) = {
> +	.name = "npcm_wdt",
> +	.id = UCLASS_WDT,
> +	.of_match = npcm_wdt_ids,
> +	.probe = npcm_wdt_probe,
> +	.priv_auto = sizeof(struct npcm_wdt_priv),
> +	.of_to_plat = npcm_wdt_of_to_plat,
> +	.ops = &npcm_wdt_ops,
> +};

Other than that looks good:

Reviewed-by: Stefan Roese <sr at denx.de>

Thanks,
Stefan