Thread (25 messages) 25 messages, 5 authors, 2025-08-01

Re: [PATCH net-next v5 02/14] docs: networking: Add PPE driver documentation for Qualcomm IPQ9574 SoC

From: Randy Dunlap <hidden>
Date: 2025-06-26 22:03:06
Also in: linux-arm-msm, linux-devicetree, linux-doc, linux-hardening, lkml

Hi--

On 6/26/25 7:31 AM, Luo Jie wrote:
+Below is a simplified hardware diagram of IPQ9574 SoC which includes the PPE engine and
+other blocks which are in the SoC but outside the PPE engine. These blocks work together
+to enable the Ethernet for the IPQ SoC::
+
[snip]
+ | |              +-------------------------+ +---------+ +---------+         | |
+ | |125/312.5M clk|       (PCS0)            | | (PCS1)  | | (PCS2)  | pcs ops | |
+ | +--------------+       UNIPHY0           | | UNIPHY1 | | UNIPHY2 |<--------+ |
+ +--------------->|                         | |         | |         |           |
+ | 31.25M ref clk +-------------------------+ +---------+ +---------+           |
+ |                   |     |      |      |          |          |                |
+ |              +-----------------------------------------------------+         |
+ |25/50M ref clk| +-------------------------+    +------+   +------+  | link    |
+ +------------->| |      QUAD PHY           |    | PHY4 |   | PHY5 |  |---------+
+                | +-------------------------+    +------+   +------+  | change
+                |                                                     |
+                |                       MDIO bus                      |
+                +-----------------------------------------------------+
Does the 'M' on the clk signals on the left side mean megahertz (MHz)?
I guess that it does, but it was a little confusing when I first saw it.

Thanks.
-- 
~Randy
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