linux-kernel - Re: [PATCH] serial: mxs-auart: keep the AUART unit in reset state when not in use

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Message-Id: <201507150934.07249.jbe@pengutronix.de>
Date:	Wed, 15 Jul 2015 09:34:07 +0200
From:	Juergen Borleis <jbe@...gutronix.de>
To:	Stefan Wahren <stefan.wahren@...e.com>
Cc:	linux-serial@...r.kernel.org, kernel@...gutronix.de,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: mxs-auart: keep the AUART unit in reset state when not in use

Hi Stefan,

On Tuesday 14 July 2015 19:33:04 Stefan Wahren wrote:
> [...]
> > diff --git a/drivers/tty/serial/mxs-auart.c 
> > b/drivers/tty/serial/mxs-auart.c index 13cf773..f42b6ad 100644
> > --- a/drivers/tty/serial/mxs-auart.c
> > +++ b/drivers/tty/serial/mxs-auart.c
> > @@ -858,6 +858,30 @@ static void mxs_auart_reset(struct uart_port *u)
> > writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR);
> > }
> >
> > +static void mxs_auart_do_reset(struct uart_port *u)
>
> i think the naming of this new function is too similiar to
> mxs_auart_reset() and doesn't represent the exact behavior. How about
> mxs_auart_keep_reset() or mxs_auart_gate()?

Hmm, maybe mxs_auart_reset() should be renamed instead, because it terminates 
the reset to this unit and make it work (called when the driver's probe 
function is running). But okay, mxs_auart_keep_reset() names more what it 
really does.

> [...]
> > + udelay(10);
>
> The delay in mxs_auart_reset() has a value of 3 microseconds. Why not the
> same here?

Hmm, good question. And why 3 us? :) I'm going to change it to 3 us as well.

> [...]
> > + /* reset the unit if not aready done */
>
> Just a typo: already?

Ups. Yes. Will fix.

Thanks!

Juergen

-- 
Pengutronix e.K.                              | Juergen Borleis             |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |
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