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From: Jeffrey Hugo <jhugo@codeaurora.org>
To: Stephen Boyd <sboyd@kernel.org>,
	bjorn.andersson@linaro.org, mark.rutland@arm.com,
	mturquette@baylibre.com, robh+dt@kernel.org
Cc: marc.w.gonzalez@free.fr, andy.gross@linaro.org,
	david.brown@linaro.org, linux-arm-msm@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v1 2/4] dt-bindings: clock: Add support for the MSM8998 mmcc
Date: Tue, 5 Feb 2019 15:08:43 -0700	[thread overview]
Message-ID: <ba5d7855-9dd2-5a99-ae8c-a7fce125ca25@codeaurora.org> (raw)
In-Reply-To: <154940414347.169292.9150834270087697417@swboyd.mtv.corp.google.com>

On 2/5/2019 3:02 PM, Stephen Boyd wrote:
> Quoting Jeffrey Hugo (2019-01-30 08:35:59)
>> Document the multimedia clock controller found on MSM8998
>>
>> Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
>> ---
>>   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.

  reply	other threads:[~2019-02-05 22:08 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-30 16:35 [PATCH v1 0/4] MSM8998 Multimedia Clock Controller Jeffrey Hugo
2019-01-30 16:35 ` [PATCH v1 1/4] clk: qcom: smd: Add XO clock for MSM8998 Jeffrey Hugo
2019-02-05 22:01   ` Stephen Boyd
2019-02-05 22:15     ` Jeffrey Hugo
2019-02-05 22:32       ` Stephen Boyd
2019-02-05 22:37         ` Jeffrey Hugo
2019-02-06 13:55         ` Georgi Djakov
2019-02-06 17:04           ` Jeffrey Hugo
2019-01-30 16:35 ` [PATCH v1 2/4] dt-bindings: clock: Add support for the MSM8998 mmcc Jeffrey Hugo
2019-02-05 22:02   ` Stephen Boyd
2019-02-05 22:08     ` Jeffrey Hugo [this message]
2019-02-05 22:16       ` Stephen Boyd
2019-02-05 22:36         ` Jeffrey Hugo
2019-01-30 16:36 ` [PATCH v1 3/4] clk: qcom: Add MSM8998 Multimedia Clock Controller (MMCC) driver Jeffrey Hugo
2019-02-05 22:06   ` Stephen Boyd
2019-02-05 22:12     ` Jeffrey Hugo
2019-02-05 22:16       ` Stephen Boyd
2019-01-30 16:36 ` [PATCH v1 4/4] arm64: dts: qcom: msm8998: Add mmcc node Jeffrey Hugo
2019-02-05 22:03   ` Stephen Boyd
2019-02-05 22:10     ` Jeffrey Hugo

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