linux-kernel - Re: [PATCH v4 02/12] [media] cxd2880-spi: Add support for CXD2880 SPI interface

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Date:   Fri, 13 Oct 2017 12:26:58 +0200
From:   Honza Petrouš <jpetrous@...il.com>
To:     "Takiguchi, Yasunari" <Yasunari.Takiguchi@...y.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "tbird20d@...il.com" <tbird20d@...il.com>,
        "frowand.list@...il.com" <frowand.list@...il.com>,
        "Yamamoto, Masayuki" <Masayuki.Yamamoto@...y.com>,
        "Nozawa, Hideki (STWN)" <Hideki.Nozawa@...y.com>,
        "Yonezawa, Kota" <Kota.Yonezawa@...y.com>,
        "Matsumoto, Toshihiko" <Toshihiko.Matsumoto@...y.com>,
        "Watanabe, Satoshi (SSS)" <Satoshi.C.Watanabe@...y.com>
Subject: Re: [PATCH v4 02/12] [media] cxd2880-spi: Add support for CXD2880 SPI interface

Hi Takiguchi,

>> If I understand it right, it uses SPI bus also for passing transport stream
>> to the host system (also having some pid piltering inside!), isn't it?
>> It would be interesting to know what is the max throughput of the CXD's SPI?
>
> Yes, max clock rate of spi is written in sony-cxd2880.txt of [patch v4 01/12].
>
>   spi-max-frequency = <55000000>; /* 55MHz */

Ehh, I overlooked this! Thanks for pointing me out.

BTW, is there any device, preferable some devboard with this silicon
on the market?

/Honza