Re: [PATCH 3/3] arm: tegra: initial support for apalis t30
flat view
From: Marcel Ziswiler <hidden>
Date: 2014-06-02 20:25:31
Also in:
linux-arm-kernel, linux-tegra, lkml
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...