linux-kernel - Re: [PATCH v4 4/4] tty: serial: 8250: add DFL bus driver for Altera 16550.

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Message-ID: <37342f3-cac7-e127-5bea-27b78dbc31c@linux.intel.com>
Date:   Fri, 21 Oct 2022 12:24:35 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Matthew Gerlach <matthew.gerlach@...ux.intel.com>
cc:     hao.wu@...el.com, yilun.xu@...el.com, russell.h.weight@...el.com,
        basheer.ahmed.muddebihal@...el.com, trix@...hat.com,
        mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        tianfei.zhang@...el.com, corbet@....net,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        Jiri Slaby <jirislaby@...nel.org>, geert+renesas@...der.be,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        niklas.soderlund+renesas@...natech.se, macro@...am.me.uk,
        johan@...nel.org, Lukas Wunner <lukas@...ner.de>,
        marpagan@...hat.com
Subject: Re: [PATCH v4 4/4] tty: serial: 8250: add DFL bus driver for Altera
 16550.

On Thu, 20 Oct 2022, matthew.gerlach@...ux.intel.com wrote:

> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> 
> Add a Device Feature List (DFL) bus driver for the Altera
> 16550 implementation of UART.
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> ---

> +	p = dfh_find_param(dfl_dev, DFHv1_PARAM_ID_REG_LAYOUT);
> +	if (!p)
> +		return dev_err_probe(dev, -EINVAL, "missing REG_LAYOUT param\n");
> +
> +	v = *p;
> +	uart->port.regshift = FIELD_GET(DFHv1_PARAM_ID_REG_SHIFT, v);
> +	reg_width = FIELD_GET(DFHv1_PARAM_ID_REG_WIDTH, v);

Just use *p directly for the FIELD_GETs. I suppose you can drop v after 
changing it.

Other than that and what Andy noted, this patch looks good.


-- 
 i.