On Mon, 2015-03-09 at 22:56 +0100, Arnd Bergmann wrote:

On Monday 09 March 2015 11:26:52 Yingjoe Chen wrote:

quoted

On Fri, 2015-03-06 at 18:48 +0800, yong.wu at mediatek.com wrote:

quoted

From: Yong Wu <yong.wu@mediatek.com>

    This patch add SMI(Smart Multimedia Interface) driver. This driver is
responsible to enable/disable iommu and control the clocks of each
local arbiter.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/soc/mediatek/Kconfig      |   7 ++
 drivers/soc/mediatek/Makefile     |   1 +
 drivers/soc/mediatek/mt8173-smi.c | 143 ++++++++++++++++++++++++++++++++++++++
 include/linux/mtk-smi.h           |  40 +++++++++++
 4 files changed, 191 insertions(+)
 create mode 100644 drivers/soc/mediatek/mt8173-smi.c
 create mode 100644 include/linux/mtk-smi.h

Hi Arnd, Matthias,

For the SMI driver, we can't find a better place, so we put it in
drivers/soc/mediatek now. Please let us know if you have any suggestion
or concern. Thanks

From what I understand from your description, I think it would better
fit in drivers/iommu. Another option is drivers/memory, which I think
is where the respective Tegra driver ended up.

Hi Arnd,

The description above only describe what is implemented now. Besides
that, SMI HW also does:

- Prioritize/arbitrate memory requests between different ports & larbs.
- Bandwidth limiter
- Performance monitor

I think drivers/memory make more sense. I can't find info about
drivers/memory in MAINTAINERS. Can this go through ARM SoC tree if we
put SMI driver there?

Joe.C