linux-kernel - Re: [PATCH v3 3/3] counter: 104-quad-8: Utilize helper functions to handle PR, FLAG and PSC

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Date:   Tue, 11 Apr 2023 16:50:03 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johannes Berg <johannes.berg@...el.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v3 3/3] counter: 104-quad-8: Utilize helper functions to
 handle PR, FLAG and PSC

On Mon, Apr 10, 2023 at 10:03:13AM -0400, William Breathitt Gray wrote:
> The Preset Register (PR), Flag Register (FLAG), and Filter Clock
> Prescaler (PSC) have common usage patterns. Wrap up such usage into
> dedicated functions to improve code clarity.

...

>  	*val = 0;

Is not needed now as always being initialized by below call.

>  	spin_lock_irqsave(&priv->lock, irqflags);
>  
>  	iowrite8(SELECT_RLD | RESET_BP | TRANSFER_CNTR_TO_OL, &chan->control);
> -
> -	for (i = 0; i < 3; i++)
> -		*val |= (unsigned long)ioread8(&chan->data) << (8 * i);
> +	ioread8_rep(&chan->data, val, 3);
>  
>  	spin_unlock_irqrestore(&priv->lock, irqflags);

...

> +	struct channel_reg __iomem *const chan = priv->reg->channel + id;

Not sure if array representation will look better here and elsewhere.

	struct channel_reg __iomem *const chan = &priv->reg->channel[id];

-- 
With Best Regards,
Andy Shevchenko