linux-kernel - Re: [RFC PATCH 1/3] watchdog: Add Meson GXBB Watchdog Driver

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Date:	Thu, 26 May 2016 12:06:55 +0200
From:	Carlo Caione <carlo@...one.org>
To:	Neil Armstrong <narmstrong@...libre.com>
Cc:	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-amlogic@...ts.infradead.org, linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 1/3] watchdog: Add Meson GXBB Watchdog Driver

On 26/05/16 09:51, Neil Armstrong wrote:
> Add watchdog specific driver for Amlogic Meson GXBB SoC.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> +

[...]
> +#define DEFAULT_TIMEOUT	10	/* seconds */
> +
> +#define GXBB_WDT_CTRL_REG	0x0
> +#define GXBB_WDT_CTRL1_REG	0x4
> +#define GXBB_WDT_TCNT_REG	0x8
> +#define GXBB_WDT_RSET_REG	0xc
> +
> +#define GXBB_WDT_CTRL_EE_RESET_NOW	BIT(26)
> +
> +#define GXBB_WDT_CTRL_CLKDIV_EN	BIT(25)
> +#define GXBB_WDT_CTRL_CLK_EN	BIT(24)
> +#define GXBB_WDT_CTRL_IRQ_EN	BIT(23)
> +#define GXBB_WDT_CTRL_EE_RESET	BIT(21)
> +#define GXBB_WDT_CTRL_XTAL_SEL	(0)
> +#define GXBB_WDT_CTRL_CLK81_SEL	BIT(19)
> +#define GXBB_WDT_CTRL_EN	BIT(18)
> +#define GXBB_WDT_CTRL_DIV_MASK	(BIT(18)-1)
> +
> +#define GXBB_WDT_CTRL1_GPIO_PULSE	BIT(17)
> +#define GXBB_WDT_CTRL1_GPIO_POL_RESET_0	BIT(16)
> +#define GXBB_WDT_CTRL1_GPIO_POL_RESET_1	(0)
> +#define GXBB_WDT_CTRL1_GPIO_PULSE_CNT	(BIT(16)-1)
> +
> +#define GXBB_WDT_TCNT_SETUP_MASK	(BIT(16)-1)
> +#define GXBB_WDT_TCNT_CNT_SHIFT		16

Indentation

[...]
> +int meson_gxbb_wdt_set_timeout(struct watchdog_device *wdt_dev,
> +			       unsigned int timeout)
> +{
> +	struct meson_gxbb_wdt *data = watchdog_get_drvdata(wdt_dev);
> +
> +	if (watchdog_active(wdt_dev))
> +		meson_gxbb_wdt_stop(wdt_dev);
> +
> +	meson_gxbb_wdt_ping(wdt_dev);
> +
> +	writel(timeout*1000, data->reg_base + GXBB_WDT_TCNT_REG);

nit: spaces around "*"

[...]
> +	data->clk = devm_clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(data->clk))
> +		return PTR_ERR(data->clk);
> +
> +	clk_prepare_enable(data->clk);

Do we need to merge the clock controller driver before this?

Cheers,

-- 
Carlo Caione