linux-kernel - Re: [PATCH 06/16] tty: serial: Add 8250-core based omap driver

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Date:	Mon, 29 Sep 2014 15:34:12 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Frans Klaver <frans.klaver@...ns.com>,
	Tony Lindgren <tony@...mide.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>, linux-serial@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 06/16] tty: serial: Add 8250-core based omap driver

On Mon, Sep 29, 2014 at 3:27 PM, Sebastian Andrzej Siewior
<bigeasy@...utronix.de> wrote:
> * Frans Klaver | 2014-09-29 11:38:23 [+0200]:
>
>>threshold
> fixed
>
>>> +    /*
>>> +     * It claims to be 16C750 compatible however it is a little different.
>>> +     * It has EFR and has no FCR7_64byte bit. The AFE (which it claims to
>>> +     * have) is enabled via EFR instead of MCR. The type is set here 8250
>>> +     * just to get things going. UNKNOWN does not work for a few reasons and
>>> +     * we don't need our own type since we don't use 8250's set_termios()
>>> +     * and our "bugs" are handeld via the bug member.
>>
>>handled
> replaced that last line with
>     or pm callback.
>
> since there no bugs member anymore.
>
>>
>>> +     */
>>> +    up.port.type = PORT_8250;
>>> +    up.port.iotype = UPIO_MEM;
>>> +    up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SOFT_FLOW |
>>> +            UPF_HARD_FLOW;
>>> +    up.port.private_data = priv;
>>> +
>>> +    up.port.regshift = 2;
>>> +    up.port.fifosize = 64;
>>> +    up.tx_loadsz = 64;
>>> +    up.capabilities = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP;
>>> +#ifdef CONFIG_PM_RUNTIME
>>> +    /*
>>> +     * PM_RUNTIME is mostly transparent. However to do it right we need to a
>>
>>need to _do_ a ...?
> I think dropping that 'to' should fix it.

Yup.

>
>>> +     * TX empty interrupt before we can put the device to auto idle. So if
>>> +     * PM_RUNTIME is not enabled we don't add that flag and can spare that
>>> +     * one extra interrupt in the TX path.
>>> +     */
>>
>><snip>
>>
>>> +config SERIAL_8250_OMAP
>>> +    tristate "Support for OMAP internal UART (8250 based driver)"
>>> +    depends on SERIAL_8250 && ARCH_OMAP2PLUS
>>> +    help
>>> +      If you have a machine based on an Texas Instruments OMAP CPU you
>>> +      can enable its onboard serial ports by enabling this option.
>>> +
>>> +      This driver is in early stage and uses ttyS instead of ttyO.
>>> +
>>
>>I just wondered if this driver should be marked experimental?
> What did you have in mind? CONFIG_EXPERIMENTAL is gone. After all that
> debuging that I had in the meantime I was thinking about dropping that
> "early stage".

That was the other option. I'm good with that. Also, I never noticed
CONFIG_EXPERIMENTAL being gone, so that's down the drain ;).

>
>>Thanks,
>>Frans
>
> Sebastian
>
> _______________________________________________
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