From: Marcel Ziswiler <marcel-mitwqZ+T+m9Wk0Htik3J/w@public.gmane.org>
To: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
stefan-XLVq0VzYD2Y@public.gmane.org
Subject: Re: [PATCH 3/3] arm: tegra: initial support for apalis t30
Date: Mon, 02 Jun 2014 22:24:41 +0200 [thread overview]
Message-ID: <538CDD89.6080605@ziswiler.com> (raw)
In-Reply-To: <538CA749.3010106-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
On 06/02/2014 06:33 PM, Stephen Warren wrote:
> I vaguely recall people speaking out against including "spidev" devices
> in DT because they don't represent actual HW, but rather a way to
> request that the SPI bus be exposed to user-space, which is a pure SW
> issue. Wouldn't it be better if the spidev interface worked like
> I2C_CHARDEV, where fake devices weren't actually required?
Well, there is one important difference. While I2C indeed does not have
any further hardware dependency apart from the clock (SCL) and data
(SDA) lines SPI actually requires dedicated hardware chip-select lines
as well. But I guess NVIDIA has been rather ignorant about any of this
in the past...
prev parent reply other threads:[~2014-06-02 20:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c5522b0efcbfc7690dcde6aaf78b9dd568f99604.1401665237.git.marcel@ziswiler.com>
[not found] ` <c5522b0efcbfc7690dcde6aaf78b9dd568f99604.1401665237.git.marcel-mitwqZ+T+m9Wk0Htik3J/w@public.gmane.org>
2014-06-01 23:37 ` [PATCH 2/3] arm: tegra: enable igb, stmpe, i2c chardev, spidev, lm95245, pwm leds Marcel Ziswiler
2014-06-02 16:11 ` Stephen Warren
2014-06-02 16:28 ` Marcel Ziswiler
[not found] ` <538CA635.4050502-mitwqZ+T+m9Wk0Htik3J/w@public.gmane.org>
2014-06-02 22:16 ` Mark Brown
[not found] ` <20140602221627.GP31751-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-06-03 6:02 ` Marcel Ziswiler
[not found] ` <538D64FD.2010909-mitwqZ+T+m9Wk0Htik3J/w@public.gmane.org>
2014-06-03 9:45 ` Mark Brown
[not found] ` <20140603094537.GQ31751-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-06-04 6:20 ` Marcel Ziswiler
2014-06-04 11:17 ` Mark Brown
[not found] ` <20140604111755.GG2520-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-06-09 22:16 ` Marcel Ziswiler
2014-06-09 22:57 ` Mark Brown
2014-06-01 23:37 ` [PATCH 3/3] arm: tegra: initial support for apalis t30 Marcel Ziswiler
[not found] ` <b470c9c8631a6ef021d140192eb07006de3cfd93.1401665237.git.marcel-mitwqZ+T+m9Wk0Htik3J/w@public.gmane.org>
2014-06-02 16:26 ` Stephen Warren
[not found] ` <538CA5C3.5050709-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2014-06-02 20:18 ` Marcel Ziswiler
[not found] ` <538CDC08.7020106-mitwqZ+T+m9Wk0Htik3J/w@public.gmane.org>
2014-06-02 20:33 ` Stephen Warren
2014-06-02 16:33 ` Stephen Warren
[not found] ` <538CA749.3010106-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2014-06-02 20:24 ` Marcel Ziswiler [this message]
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