Messages in this thread | | | Date | Mon, 02 Jun 2014 22:24:41 +0200 | From | Marcel Ziswiler <> | Subject | Re: [PATCH 3/3] arm: tegra: initial support for apalis t30 |
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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...
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