Subject: [PATCH v3 2/3] watchdog: orion: Use the reference clock on Armada 375 SoC

From: [email-masked] (Gregory CLEMENT)
Date: Mon, 10 Nov 2014 15:41:52 +0100

Hi Ezequiel,

[...]

> +static int armada375_wdt_clock_init(struct platform_device *pdev,
> +				    struct orion_watchdog *dev)
> +{
> +	int ret;
> +
> +	dev->clk = of_clk_get_by_name(pdev->dev.of_node, "fixed");
> +	if (!IS_ERR(dev->clk)) {
> +		ret = clk_prepare_enable(dev->clk);
> +		if (ret) {
> +			clk_put(dev->clk);
> +			return ret;
> +		}
> +
> +		atomic_io_modify(dev->reg + TIMER_CTRL,
> +				WDT_AXP_FIXED_ENABLE_BIT,
> +				WDT_AXP_FIXED_ENABLE_BIT);
> +		dev->clk_rate = clk_get_rate(dev->clk);
> +
> +		return 0;
> +	}
> +
> +	/* Mandatory fallback for proper devicetree backward compatibility */
> +	dev->clk = clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(dev->clk))
> +		return PTR_ERR(dev->clk);
> +
> +	ret = clk_prepare_enable(dev->clk);
> +	if (ret) {
> +		clk_put(dev->clk);
> +		return ret;
> +	}
> +
> +	atomic_io_modify(dev->reg + TIMER_CTRL,
> +			WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT),
> +			WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT));
> +	dev->clk_rate = clk_get_rate(dev->clk) / WDT_A370_RATIO;
> +
> +	return 0;
> +}

Shouldn't be possible to do the following:

static int armada375_wdt_clock_init(struct platform_device *pdev,
				    struct orion_watchdog *dev)
{
	if (armadaxp_wdt_clock_init(pdev, dev)) {
		/* Mandatory fallback for proper devicetree backward compatibility */
		return armadaxp_wdt_clock_init(pdev, dev));
	}
	return 0;
}

Actually reusing the armadaxp_wdt_clock_init() function  was also suggested by Thomas
on your first version but I didn't find your answer about it.

Thanks,

Gregory

> +
>  static int armadaxp_wdt_clock_init(struct platform_device *pdev,
>  				   struct orion_watchdog *dev)
>  {
> @@ -394,7 +434,7 @@ static const struct orion_watchdog_data armada375_data = {
>  	.rstout_mask_bit = BIT(10),
>  	.wdt_enable_bit = BIT(8),
>  	.wdt_counter_offset = 0x34,
> -	.clock_init = armada370_wdt_clock_init,
> +	.clock_init = armada375_wdt_clock_init,
>  	.enabled = armada375_enabled,
>  	.start = armada375_start,
>  	.stop = armada375_stop,
> 

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com