Re: [PATCH v5 12/20] memory: mtk-smi: Add gals support
From: Yong Wu <yong.wu@mediatek.com>
Date: 2019-01-14 06:57:42
Also in:
linux-iommu, linux-mediatek, lkml
Hi Matthias,
Gentle ping about this and the other mtk-smi part in this patchset.
The memory part don't have its specific maintainer, normally we need
SoC maintain's help. Thus, For this file(memory/mtk-smi.c), your review
is needed before Joerg accept it.
Appreciate in advance.
On Tue, 2019-01-01 at 11:55 +0800, Yong Wu wrote:In some SoCs like mt8183, SMI add GALS(Global Async Local Sync) module
which can help synchronize for the modules in different clock frequency.
It can be seen as a "asynchronous fifo". This is a example diagram:
M4U
|
----------
| |
gals0-rx gals1-rx
| |
| |
gals0-tx gals1-tx
| |
------------
SMI Common
------------
|
+-----+--------+-----+- ...
| | | |
| gals-rx gals-rx |
| | | |
| | | |
| gals-tx gals-tx |
| | | |
larb1 larb2 larb3 larb4
GALS only help transfer the command/data while it doesn't have the
configuring register, thus it has the special "smi" clock and doesn't
have the "apb" clock. From the diagram above, we add "gals0" and
"gals1" clocks for smi-common and add a "gals" clock for smi-larb.
This patch adds gals clock supporting in the SMI. Note that some larbs
may still don't have the "gals" clock like larb1 and larb4 above.
This is also a preparing patch for mt8183 which has GALS.
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
drivers/memory/mtk-smi.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)[...] _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel