Linux-ARM-MSM Archive on lore.kernel.org
 help / color / Atom feed
From: Stephen Boyd <sboyd@kernel.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>, Vinod Koul <vkoul@kernel.org>,
	linux-arm-msm@vger.kernel.org, sibis@codeaurora.org,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/22] arm64: dts: qcom: sm8150: add base dts file
Date: Wed, 14 Aug 2019 11:35:51 -0700
Message-ID: <20190814183552.5FF062133F@mail.kernel.org> (raw)
In-Reply-To: <20190814174439.GE6167@minitux>

Quoting Bjorn Andersson (2019-08-14 10:44:39)
> On Wed 14 Aug 09:58 PDT 2019, Stephen Boyd wrote:
> 
> > Quoting Vinod Koul (2019-08-14 05:49:51)
> > > diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> [..]
> > > +       clocks {
> > > +               xo_board: xo-board {
> > > +                       compatible = "fixed-clock";
> > > +                       #clock-cells = <0>;
> > > +                       clock-frequency = <19200000>;
> > 
> > Is it 19.2 or 38.4 MHz? It seems like lately there are dividers, but I
> > guess it doesn't really matter in the end.
> > 
> 
> As with previous platforms, the board's XO feeds the PMIC at 38.4MHz and
> the SoC's CXO_IN pin (i.e. bi_tcxo) is fed from the PMIC's LNBBCLK1,
> which is ticking at 19.2MHz.
> 
> [..]
> > > +               gcc: clock-controller@100000 {
> > > +                       compatible = "qcom,gcc-sm8150";
> > > +                       reg = <0x00100000 0x1f0000>;
> > > +                       #clock-cells = <1>;
> > > +                       #reset-cells = <1>;
> > > +                       #power-domain-cells = <1>;
> > > +                       clock-names = "bi_tcxo", "sleep_clk";
> > > +                       clocks = <&xo_board>, <&sleep_clk>;
> 
> So this first one should actually be <&rpmhcc LNBBCLK1>.

Hrmm LNBBCLK1 doesn't make any sense to me. That's a buffer that is
technically the net connected to the XO pin on the Soc, but it isn't
really supposed to be used by anything from what I recall. Last time I
tried to use the buffers the RPM team told me I was using the wrong
resource and I should just use the XO resource instead. Doesn't RPMh
expose the other "XO" resource that is supposed to prevent XO shutdown?
Just mark it critical for now so that XO isn't turned off at runtime.

> 
> But while we now should handle this gracefully in the clock driver I
> think we still have problems with the cascading probe deferral that
> follows - last time I tried to do this the serial driver probe deferred
> past user space initialization and the system crashed as we didn't have
> a /dev/console.

Does the serial driver probe eventually? Maybe you can run agetty when
the device appears based on some uevent for /dev/console. Or we have a
bug where /dev/console is created by devtmpfs when there isn't actually
a console?

> 
> 
> So, I think we should s/xo_board/lnbbclk1/ (at 19.2MHz) to make it
> represent the schematics and then once we have rpmhcc and validated that
> the system handles this gracefully we can switch it out.
> 

Sure, some sort of approach that switches it later on is fine, just want
to make sure that the board clk frequency is accurately reflected in the
DT.


  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14 12:49 [PATCH 00/22] arm64: dts: qcom: sm8150: Add SM8150 DTS Vinod Koul
2019-08-14 12:49 ` [PATCH 01/22] arm64: dts: qcom: sm8150: add base dts file Vinod Koul
2019-08-14 16:58   ` Stephen Boyd
2019-08-14 17:44     ` Bjorn Andersson
2019-08-14 18:35       ` Stephen Boyd [this message]
2019-08-14 19:02         ` Bjorn Andersson
2019-08-14 17:50   ` Bjorn Andersson
2019-08-14 12:49 ` [PATCH 02/22] arm64: dts: qcom: sm8150-mtp: " Vinod Koul
2019-08-14 17:53   ` Bjorn Andersson
2019-08-14 12:49 ` [PATCH 03/22] arm64: dts: qcom: sm8150: add tlmm node Vinod Koul
2019-08-14 17:01   ` Stephen Boyd
2019-08-19 17:09     ` Vinod Koul
2019-08-14 12:49 ` [PATCH 04/22] arm64: dts: qcom: sm8150-mtp: add tlmm reserved range Vinod Koul
2019-08-14 17:01   ` Stephen Boyd
2019-08-14 12:49 ` [PATCH 05/22] arm64: dts: qcom: sm8150: Add spmi node Vinod Koul
2019-08-14 17:01   ` Stephen Boyd
2019-08-14 12:49 ` [PATCH 06/22] arm64: dts: qcom: pm8150: Add Base DTS file Vinod Koul
2019-08-14 17:03   ` Stephen Boyd
2019-08-19 17:28     ` Vinod Koul
2019-08-14 12:49 ` [PATCH 07/22] arm64: dts: qcom: pm8150: Add pon and rtc nodes Vinod Koul
2019-08-14 17:03   ` Stephen Boyd
2019-08-19 17:32     ` Vinod Koul
2019-08-14 12:49 ` [PATCH 08/22] arm64: dts: qcom: pm8150: Add vadc node Vinod Koul
2019-08-14 17:05   ` Stephen Boyd
2019-08-14 12:49 ` [PATCH 09/22] arm64: dts: qcom: pm8150b: Add Base DTS file Vinod Koul
2019-08-14 17:05   ` Stephen Boyd
2019-08-14 12:50 ` [PATCH 10/22] arm64: dts: qcom: pm8150b: Add pon and adc nodes Vinod Koul
2019-08-14 17:08   ` Stephen Boyd
2019-08-19 17:43     ` Vinod Koul
2019-08-19 17:56       ` Stephen Boyd
2019-08-20  3:46         ` Vinod Koul
2019-08-14 18:00   ` Bjorn Andersson
2019-08-14 12:50 ` [PATCH 11/22] arm64: dts: qcom: pm8150b: Add gpio node Vinod Koul
2019-08-14 17:08   ` Stephen Boyd
2019-08-14 12:50 ` [PATCH 12/22] arm64: dts: qcom: pm8150l: Add Base DTS file Vinod Koul
2019-08-14 17:10   ` Stephen Boyd
2019-08-14 12:50 ` [PATCH 13/22] arm64: dts: qcom: pm8150l: Add pon and adc nodes Vinod Koul
2019-08-14 17:10   ` Stephen Boyd
2019-08-14 12:50 ` [PATCH 14/22] arm64: dts: qcom: pm8150l: Add gpio node Vinod Koul
2019-08-14 12:50 ` [PATCH 15/22] arm64: dts: qcom: sm8150-mtp: Include pmics Vinod Koul
2019-08-14 12:50 ` [PATCH 16/22] arm64: dts: qcom: sm8150-mtp: Add resin node Vinod Koul
2019-08-14 12:50 ` [PATCH 17/22] arm64: dts: qcom: sm8150: Add apss_shared and apps_rsc nodes Vinod Koul
2019-08-14 17:12   ` Stephen Boyd
2019-08-19 17:35     ` Vinod Koul
2019-08-14 12:50 ` [PATCH 18/22] arm64: dts: qcom: sm8150: Add reserved-memory regions Vinod Koul
2019-08-14 17:13   ` Stephen Boyd
2019-08-19 17:36     ` Vinod Koul
2019-08-14 12:50 ` [PATCH 19/22] arm64: dts: qcom: sm8150-mtp: Add regulators Vinod Koul
2019-08-14 12:50 ` [PATCH 20/22] arm64: dts: qcom: sm8150: Add pmu node to SM8150 SoC Vinod Koul
2019-08-14 17:15   ` Stephen Boyd
2019-08-14 12:50 ` [PATCH 21/22] arm64: dts: qcom: sm8150: Add SMEM nodes Vinod Koul
2019-08-14 17:16   ` Stephen Boyd
2019-08-14 12:50 ` [PATCH 22/22] arm64: dts: qcom: sm8150: Add APSS shared mailbox Vinod Koul
2019-08-14 17:17   ` Stephen Boyd
2019-08-19 17:41     ` Vinod Koul
2019-08-20  6:20       ` Sibi Sankar
2019-08-20  6:37         ` Vinod Koul

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190814183552.5FF062133F@mail.kernel.org \
    --to=sboyd@kernel.org \
    --cc=agross@kernel.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=robh+dt@kernel.org \
    --cc=sibis@codeaurora.org \
    --cc=vkoul@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-ARM-MSM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-msm/0 linux-arm-msm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-arm-msm linux-arm-msm/ https://lore.kernel.org/linux-arm-msm \
		linux-arm-msm@vger.kernel.org linux-arm-msm@archiver.kernel.org
	public-inbox-index linux-arm-msm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-arm-msm


AGPL code for this site: git clone https://public-inbox.org/ public-inbox