linux-kernel - Re: [PATCH v6 10/40] dma: cirrus: Convert to DT for Cirrus EP93xx

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Message-ID: <ZXn32V0giIF754jR@smile.fi.intel.com>
Date:   Wed, 13 Dec 2023 20:28:41 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 10/40] dma: cirrus: Convert to DT for Cirrus EP93xx

On Tue, Dec 12, 2023 at 11:20:27AM +0300, Nikita Shubin wrote:
> Convert Cirrus EP93xx DMA to device tree usage:
> 
> - add OF ID match table with data
> - add of_probe for device tree
> - add xlate for m2m/m2p
> - drop subsys_initcall code
> - drop platform probe
> - drop platform structs usage
> 
> >From now only it supports only device tree probing.

"From now on it only..." (and single "only" is enough).

...

> +		edmac->clk = devm_clk_get(dev, dma_clk_name);
>  		if (IS_ERR(edmac->clk)) {
> +			dev_warn(dev, "failed to get clock\n");
>  			continue;
>  		}

This is incorrect, it doesn't handle deferred probe in two aspects:
- spamming the logs;
- not really trying to reprobe.

...

> +static bool ep93xx_m2p_dma_filter(struct dma_chan *chan, void *filter_param)
> +{
> +	struct ep93xx_dma_chan *echan = to_ep93xx_dma_chan(chan);
> +	struct ep93xx_dma_chan_cfg *cfg = filter_param;
> +
> +	if (cfg->dir == ep93xx_dma_chan_direction(chan)) {
> +		echan->dma_cfg = *cfg;
> +		return true;
> +	}
> +
> +	return false;

Perhaps

	if (cfg->dir != ep93xx_dma_chan_direction(chan))
		return false;

	echan->dma_cfg = *cfg;
	return true;

> +}

...

> +	if (!is_slave_direction(direction))
> +		return NULL;
> +
> +

One blank line is enough.

...

> +	switch (port) {
> +	case EP93XX_DMA_SSP:
> +	case EP93XX_DMA_IDE:
> +		break;
> +	default:
> +		return NULL;
> +	}

> +	if (!is_slave_direction(direction))
> +		return NULL;

This can be performed before switch, no?

...

> +#include <linux/device.h>
> +#include <linux/property.h>
> +#include <linux/string.h>
>  #include <linux/types.h>
>  #include <linux/dmaengine.h>
>  #include <linux/dma-mapping.h>

Perhaps make it a bit more ordered by squeezing to the (most) ordered parts?

-- 
With Best Regards,
Andy Shevchenko