linux-kernel - Re: [PATCH v10 4/4] tty: serial: 8250: add DFL bus driver for Altera 16550.

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Message-ID: <alpine.DEB.2.22.394.2301101415370.815911@rhweight-WRK1>
Date:   Tue, 10 Jan 2023 14:17:10 -0800 (PST)
From:   matthew.gerlach@...ux.intel.com
To:     Andy Shevchenko <andriy.shevchenko@...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, linux-kernel@...r.kernel.org,
        tianfei.zhang@...el.com, corbet@....net,
        gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        jirislaby@...nel.org, geert+renesas@...der.be,
        niklas.soderlund+renesas@...natech.se, macro@...am.me.uk,
        johan@...nel.org, lukas@...ner.de, ilpo.jarvinen@...ux.intel.com,
        marpagan@...hat.com, bagasdotme@...il.com
Subject: Re: [PATCH v10 4/4] tty: serial: 8250: add DFL bus driver for Altera
 16550.



On Tue, 10 Jan 2023, Andy Shevchenko wrote:

> On Mon, Jan 09, 2023 at 04:30:29PM -0800, 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.
>
> ...
>
>> +static int dfh_get_u64_param_val(struct dfl_device *dfl_dev, int param_id, u64 *pval)
>> +{
>> +	size_t psize;
>> +	u64 *p;
>> +
>> +	p = dfh_find_param(dfl_dev, param_id, &psize);
>> +	if (IS_ERR(p))
>> +		return PTR_ERR(p);
>
>> +	if (psize != sizeof(u64))
>> +		return -EINVAL;
>
> If this code stays in the newer versions, make it more robust against changes,
> i.e. by using sizeof(*pval).

Yes, sizeof(*pval) would be more robust if this ode stays in the newer 
versions.

>
>> +	*pval = *p;
>> +
>> +	return 0;
>> +}
>
> ...
>
>> +config SERIAL_8250_DFL
>> +	tristate "DFL bus driver for Altera 16550 UART"
>
> 5
>
>> +	depends on SERIAL_8250 && FPGA_DFL
>> +	help
>> +	  This option enables support for a Device Feature List (DFL) bus
>> +	  driver for the Altera 16650 UART. One or more Altera 16650 UARTs
>
> 6
>
> Which one is correct?

Great catch! The typo has been there since v1.  I will update to 16550.

Thanks,
Matthew Gerlach

>
>> +	  can be instantiated in a FPGA and then be discovered during
>> +	  enumeration of the DFL bus.
>> +
>> +	  To compile this driver as a module, chose M here: the
>> +	  module will be called 8250_dfl.
>
> -- 
> With Best Regards,
> Andy Shevchenko
>
>
>