linux-kernel - Re: [PATCH v5 3/3] serial: sc16is7xx: add support for EXAR XR20M1172 UART

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Message-ID: <afeae80e-d854-4f38-981e-7e9f414400b7@kernel.org>
Date: Mon, 22 Apr 2024 19:28:54 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: "Konstantin P." <ria.freelander@...il.com>
Cc: Konstantin Pugin <rilian.la.te@...ru>, krzk@...nel.org, conor@...nel.org,
 lkp@...el.com, vz@...ia.com, robh@...nel.org, jcmvbkbc@...il.com,
 nicolas.ferre@...rochip.com, manikanta.guntupalli@....com, corbet@....net,
 ychuang3@...oton.com, u.kleine-koenig@...gutronix.de,
 Maarten.Brock@...ls.nl, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Herve Codina <herve.codina@...tlin.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Hugo Villeneuve <hvilleneuve@...onoff.com>,
 Lech Perczak <lech.perczak@...lingroup.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v5 3/3] serial: sc16is7xx: add support for EXAR XR20M1172
 UART

On 22. 04. 24, 14:00, Konstantin P. wrote:
> On Mon, Apr 22, 2024 at 9:30 AM Jiri Slaby <jirislaby@...nel.org> wrote:
>>
>> On 20. 04. 24, 20:22, Konstantin Pugin wrote:
>>> From: Konstantin Pugin <ria.freelander@...il.com>
>>>
>>> XR20M1172 register set is mostly compatible with SC16IS762, but it has
>>> a support for additional division rates of UART with special DLD register.
>>> So, add handling this register by appropriate devicetree bindings.
>> ...
>>> --- a/drivers/tty/serial/sc16is7xx.c
>>> +++ b/drivers/tty/serial/sc16is7xx.c
>> ...
>>> @@ -555,18 +578,43 @@ static bool sc16is7xx_regmap_noinc(struct device *dev, unsigned int reg)
>>>        return reg == SC16IS7XX_RHR_REG;
>>>    }
>>>
>>> +static bool sc16is7xx_has_dld(struct device *dev)
>>> +{
>>> +             struct sc16is7xx_port *s = dev_get_drvdata(dev);
>>> +
>>> +             if (s->devtype == &xr20m1172_devtype)
>>> +                     return true;
>>> +             return false;
>>
>> :) so this should simply be:
>>
>> return s->devtype == &xr20m1172_devtype;
>>
> I especially want to avoid this construction, because it will lead to
> idea than we does not have other
> DLD-capable UARTS, which is simply not true, there is, for example,
> XR20M1280 UART, which has roughly the same register set
> (https://www.alldatasheet.com/datasheet-pdf/pdf/445109/EXAR/XR20M1280.html).
> I simply do not have other devices, so I do not
> want to risk sending untested patches upstream.

Sorry, what?

-- 
js
suse labs