linux-kernel - Re: [PATCH] tty: samsung_tty: 32-bit access for TX/RX hold registers

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Message-ID: <20200401085548.GC2026666@kroah.com>
Date:   Wed, 1 Apr 2020 10:55:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Hyunki Koo <hyunki00.koo@...sung.com>
Cc:     hyunki00.koo@...il.com, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Jiri Slaby <jslaby@...e.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: samsung_tty: 32-bit access for TX/RX hold registers

On Wed, Apr 01, 2020 at 05:27:20PM +0900, Hyunki Koo wrote:
> -	if (np)
> +	if (np) {
>  		of_property_read_u32(np,
>  			"samsung,uart-fifosize", &ourport->port.fifosize);
>  
> +		if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
> +			switch (prop) {
> +			case 1:
> +				ourport->port.iotype = UPIO_MEM;
> +				break;
> +			case 4:
> +				ourport->port.iotype = UPIO_MEM32;
> +				break;
> +			default:
> +				dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
> +						prop);
> +				ret = -EINVAL;
> +				break;
> +			}
> +		}
> +	}
> +

Does this mean that reg-io-width is now a required property for all
samsung uarts?  Does this break older dts files?  Or should you
fall-back to the previous operation if the attribute is not there?

And please fix your email client, the headers were all messed up,
causing my initial response to be only sent to you :(

thanks,

greg k-h