linux-kernel - Re: [PATCH v1 5/5] tty: serial: 8250: add DFL bus driver for Altera 16550.

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Date:   Mon, 12 Sep 2022 13:54:20 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     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, 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, phil.edworthy@...esas.com,
        macro@...am.me.uk, johan@...nel.org, lukas@...ner.de
Subject: Re: [PATCH v1 5/5] tty: serial: 8250: add DFL bus driver for Altera
 16550.

On Sun, Sep 11, 2022 at 08:56:41AM -0700, matthew.gerlach@...ux.intel.com wrote:
> On Fri, 9 Sep 2022, Andy Shevchenko wrote:
> > On Thu, Sep 08, 2022 at 11:27:03AM -0700, matthew.gerlach@...ux.intel.com wrote:
> > > On Tue, 6 Sep 2022, Andy Shevchenko wrote:
> > > > On Tue, Sep 06, 2022 at 12:04:26PM -0700, matthew.gerlach@...ux.intel.com wrote:

...

> > > > > +	dev_dbg(dfluart->dev, "UART_CLK_ID %llu Hz\n", dfluart->uart_clk);
> > > > 
> > > > Isn't this available via normal interfaces to user?
> > > 
> > > I am not sure what "normal interfaces to user" you are referring to.  The
> > > code is just trying to read the frequency of the input clock to the uart
> > > from a DFH paramter.
> > 
> > I mean dev_dbg() call. The user can get uart_clk via one of the UART/serial
> > ABIs (don't remember which one, though).
> 
> I don't think UART/serial ABIs to get the input clock frequency would be
> available until after the call to serial8250_register_8250_port()

Is it a problem?

> which needs the clock frequency as an input.

-- 
With Best Regards,
Andy Shevchenko