Thread (20 messages) 20 messages, 3 authors, 2019-02-06

Re: [PATCH v1 2/4] dt-bindings: clock: Add support for the MSM8998 mmcc

From: Jeffrey Hugo <hidden>
Date: 2019-02-05 22:08:52
Also in: linux-arm-msm, linux-clk, lkml

On 2/5/2019 3:02 PM, Stephen Boyd wrote:
Quoting Jeffrey Hugo (2019-01-30 08:35:59)
quoted
Document the multimedia clock controller found on MSM8998

Signed-off-by: Jeffrey Hugo <redacted>
---
  Documentation/devicetree/bindings/clock/qcom,mmcc.txt | 7 +++++++
  1 file changed, 7 insertions(+)
diff --git a/Documentation/devicetree/bindings/clock/qcom,mmcc.txt b/Documentation/devicetree/bindings/clock/qcom,mmcc.txt
index 8b0f784..ae85bca 100644
--- a/Documentation/devicetree/bindings/clock/qcom,mmcc.txt
+++ b/Documentation/devicetree/bindings/clock/qcom,mmcc.txt
@@ -10,11 +10,18 @@ Required properties :
                         "qcom,mmcc-msm8960"
                         "qcom,mmcc-msm8974"
                         "qcom,mmcc-msm8996"
+                       "qcom,mmcc-msm8998"
  
  - reg : shall contain base register location and length
  - #clock-cells : shall contain 1
  - #reset-cells : shall contain 1
  
+For MSM8998 only:
+       - clocks: a list of phandles and clock-specifier pairs,
+                 one for each entry in clock-names.
+       - clock-names: "xo" for the xo clock,
+                      "gpll0" for the global pll 0 clock.
Wouldn't the DSI plls also be listed here? And anything else that is
external to this clock controller?
We can't get the DSI plls from DT as far as I am aware (upstream).  That 
is why I mentioned in the cover letter we need to rely on the global 
namespace.

Also, the DSI plls, etc present a chicken and egg situation, as the plls 
require mmcc, and mmcc requires the plls.  I forsee an unsolvable 
EPROBE_DEFER issue.

-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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