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From: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
To: Heiner Kallweit
	<hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Geert Uytterhoeven
	<geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Brian Norris
	<computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Michal Suchanek
	<hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	MTD Maling List
	<linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	Cyrille Pitchen
	<cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>,
	Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>,
	linux-spi <linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH 2/2] mtd: m25p80: consider max_transfer_size when reading
Date: Tue, 07 Jun 2016 00:28:11 +0200	[thread overview]
Message-ID: <5755F8FB.2070409@denx.de> (raw)
In-Reply-To: <971ad721-5644-e5f9-2918-65db0e6b1996-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

On 06/06/2016 11:20 PM, Heiner Kallweit wrote:
> Am 06.06.2016 um 21:46 schrieb Geert Uytterhoeven:
>> Hi Heiner,
>>
>> On Mon, Jun 6, 2016 at 8:53 PM, Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>> Am 06.06.2016 um 19:40 schrieb Mark Brown:
>>>> On Sat, Jun 04, 2016 at 12:22:37AM +0200, Heiner Kallweit wrote:
>>>>> Am 06.05.2016 um 14:14 schrieb Mark Brown:
>>>>>> Yes, it's called the maximum transfer size because it is the
>>>>>> maximum size of a transfer, not because it's the maximum size of
>>>>>> a message.
>>>>
>>>>> I'd like to come back to this discussion. You said best would be
>>>>> to fix the chip driver. To do this and calculate an appropriate
>>>>> value for max_transfer_size the chip driver would have to know that
>>>>> the spi_device is a spi-nor device.
>>>>
>>>> That doesn't make any sense, the controller hardware doesn't
>>>> magically change based on what is connected to it.
>>>>
>>> The issue with fsl-espi is that the controller deactivates CS after
>>> each physical transfer. And a lot of HW designs use the hardware CS,
>>> therefore the advise to use a GPIO instead doesn't really help.
>>
>> And you can't use pinmux to configure the pin used for hardware CS
>> to become a GPIO?
>>
> Sadly enough, no. Only the complete block of SPI signals can be switched
> to GPIO mode. But then we'd have to use bitbanging and would loose all
> features of the integrated SPI controller (FIFO's etc.)

Just for completeness, which SoC are we talking about here ?

-- 
Best regards,
Marek Vasut
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  parent reply	other threads:[~2016-06-06 22:28 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <56D22823.7090005@gmail.com>
     [not found] ` <20160405193952.GA5243@localhost>
     [not found]   ` <57041B43.2000109@gmail.com>
     [not found]     ` <20160405210727.GB5243@localhost>
     [not found]       ` <5706B084.2070909@gmail.com>
     [not found]         ` <5706B084.2070909-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-05-05 23:57           ` [PATCH 2/2] mtd: m25p80: consider max_transfer_size when reading Brian Norris
     [not found]             ` <20160505235700.GA99474-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2016-05-06 12:14               ` Mark Brown
     [not found]                 ` <20160506121431.GQ6292-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-06-03 22:22                   ` Heiner Kallweit
     [not found]                     ` <77a22258-95ca-031a-825d-a9e98e30a162-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-06 17:40                       ` Mark Brown
     [not found]                         ` <20160606174003.GE7510-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-06-06 18:28                           ` Brian Norris
     [not found]                             ` <20160606182803.GA128439-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2016-06-06 18:34                               ` Mark Brown
     [not found]                                 ` <20160606183426.GJ7510-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-06-06 18:43                                   ` Brian Norris
     [not found]                                     ` <20160606184348.GA135086-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2016-06-06 18:48                                       ` Mark Brown
2016-06-06 18:53                           ` Heiner Kallweit
     [not found]                             ` <a57adb90-0d80-186f-17d3-6fdf106bfb4a-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-06 19:40                               ` Michal Suchanek
     [not found]                                 ` <CAOMqctRH9a0QmubdAvbyk=AC10MSa=nsNRkSURU+JOwKrN9HCA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-06 21:02                                   ` Heiner Kallweit
2016-06-06 19:46                               ` Geert Uytterhoeven
2016-06-06 21:20                                 ` Heiner Kallweit
     [not found]                                   ` <971ad721-5644-e5f9-2918-65db0e6b1996-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-06 22:28                                     ` Marek Vasut [this message]
     [not found]                                       ` <5755F8FB.2070409-ynQEQJNshbs@public.gmane.org>
2016-06-07  4:52                                         ` Heiner Kallweit
2016-06-06 23:07                               ` Mark Brown
     [not found]                                 ` <20160606230752.GM7510-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-06-07  6:03                                   ` Heiner Kallweit
     [not found]                                     ` <fe0042f9-66c9-51fd-ca91-641c5cc25c40-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-07  8:10                                       ` Michal Suchanek
     [not found]                                         ` <CAOMqctRmtCXurb8A05m2kw+9EjU+AWB8Uj0z1FPO792kGG=36Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-07 20:42                                           ` Heiner Kallweit
2016-06-08 19:51                                       ` Heiner Kallweit
     [not found]                                         ` <20977e07-6354-2753-8286-e992c32454d1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-09  7:12                                           ` Michal Suchanek
     [not found]                                             ` <CAOMqctQfsN4OoXN59yH13n-UJiEUJVOkxzMTMAndmBc8Dq+ANA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-17 20:13                                               ` Heiner Kallweit

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