linux-kernel - Re: [PATCH v3 2/2] tty/serial: atmel: add ISO7816 support

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Message-ID: <20180809113035.kftvdalca7zsf4ly@M43218.corp.atmel.com>
Date:   Thu, 9 Aug 2018 13:30:35 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Richard Genoud <richard.genoud@...il.com>
CC:     <linux-serial@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <alexandre.belloni@...tlin.com>, <arnd@...db.de>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
        <jslaby@...e.com>
Subject: Re: [PATCH v3 2/2] tty/serial: atmel: add ISO7816 support

Hi Richard,

On Thu, Aug 09, 2018 at 10:47:17AM +0200, Richard Genoud wrote:
> Hi !
> 
> On 07/08/2018 15:00, Ludovic Desroches wrote:
> > From: Nicolas Ferre <nicolas.ferre@...rochip.com>
> > 
> > When mode is set in atmel_config_iso7816() we backup last RS232 mode
> > for coming back to this mode if requested.
> > Also allow setup of T=0 and T=1 parameter and basic support in set_termios
> > function as well.
> > 
> > Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
> > [ludovic.desroches@...rochip.com: rebase, add check on fidi ratio, checkpatch fixes]
> > Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> > ---
> >  drivers/tty/serial/atmel_serial.c | 211 +++++++++++++++++++++++++++++++++++---
> >  drivers/tty/serial/atmel_serial.h |   6 +-
> >  2 files changed, 201 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> > index 8e4428725848..4a7ec44b0ace 100644
> > --- a/drivers/tty/serial/atmel_serial.c
> > +++ b/drivers/tty/serial/atmel_serial.c

[...]

> >  #if defined(CONFIG_OF)
> > +static struct atmel_uart_pdata at91rm9200_pdata = {
> > +	.fidi_min = 1,
> > +	.fidi_max = 2047,
> > +};
> > +
> > +static struct atmel_uart_pdata at91sam9260_pdata = {
> > +	.fidi_min = 1,
> > +	.fidi_max = 2047,
> > +};
> > +
> > +static struct atmel_uart_pdata sama5d3_pdata = {
> > +	.fidi_min = 3,
> > +	.fidi_max = 65535,
> Are you sure this is for sama5d3 ?
> From the datasheets I have, 65535 is for sama5d4/sama5d2

I checked it and I missed it. What a pity... In fact, it's a bit more
tricky since the min value for d3 is 3 and no longer 1.

> And also, you'll have to s/atmel,at91sam9260-usart/atmel,sama5d2-usart/g
> in sama5d{2,4}.dtsi
>

Yes, I planed to send it later but I can add those patches within this
set of patches. 

> But I wonder if it could be detected via ATMEL_US_VERSION instead ?
> 

I have not checked, I tend to prefer the compatible string for this kind
of thing. But as we already use the version number, I can investigate
this solution if it's the one you prefer.


Regards

Ludovic