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Message-ID: <YRPkI8AQAjjFuXcf@google.com>
Date: Wed, 11 Aug 2021 07:52:19 -0700
From: Matthias Kaehlcke <mka@...omium.org>
To: rajpat@...eaurora.org
Cc: Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, rnayak@...eaurora.org,
saiprakash.ranjan@...eaurora.org, msavaliy@....qualcomm.com,
skakit@...eaurora.org, Roja Rani Yarubandi <rojay@...eaurora.org>
Subject: Re: [PATCH V4 2/4] arm64: dts: sc7280: Add QUPv3 wrapper_0 nodes
On Wed, Aug 11, 2021 at 05:43:48PM +0530, rajpat@...eaurora.org wrote:
> On 2021-07-26 21:32, Matthias Kaehlcke wrote:
> > On Mon, Jul 26, 2021 at 07:10:45PM +0530, Rajesh Patil wrote:
> > > From: Roja Rani Yarubandi <rojay@...eaurora.org>
> > >
> > > Add QUPv3 wrapper_0 DT nodes for SC7280 SoC.
> > >
> > > Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
> > > Signed-off-by: Rajesh Patil <rajpat@...eaurora.org>
> > > ---
> > > Changes in V4:
> > > - As per Bjorn's comment, added QUP Wrapper_0 nodes
> > > other than debug-uart node
> > > - Dropped interconnect votes for wrapper_0 node
> > >
> > > Changes in V3:
> > > - Broken the huge V2 patch into 3 smaller patches.
> > > 1. QSPI DT nodes
> > > 2. QUP wrapper_0 DT nodes
> > > 3. QUP wrapper_1 DT nodes
> > >
> > > Changes in V2:
> > > - As per Doug's comments removed pinmux/pinconf subnodes.
> > > - As per Doug's comments split of SPI, UART nodes has been done.
> > > - Moved QSPI node before aps_smmu as per the order.
> > >
> > > arch/arm64/boot/dts/qcom/sc7280-idp.dts | 84 ++++
> > > arch/arm64/boot/dts/qcom/sc7280.dtsi | 720
> > > ++++++++++++++++++++++++++++++++
> > > 2 files changed, 804 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> > > b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> > > index b0bfd8e..f63cf51 100644
> > > --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> > > +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> > > @@ -358,6 +358,16 @@
> > > vdda18-supply = <&vreg_l1c_1p8>;
> > > };
> > >
> > > +&uart7 {
> > > + status = "okay";
> > > +
> > > + /delete-property/interrupts;
> > > + interrupts-extended = <&intc GIC_SPI 608 IRQ_TYPE_LEVEL_HIGH>,
> > > + <&tlmm 31 IRQ_TYPE_EDGE_FALLING>;
> > > + pinctrl-names = "default", "sleep";
> > > + pinctrl-1 = <&qup_uart7_sleep_cts>, <&qup_uart7_sleep_rts>,
> > > <&qup_uart7_sleep_tx>, <&qup_uart7_sleep_rx>;
> > > +};
> > > +
> > > /* PINCTRL - additions to nodes defined in sc7280.dtsi */
> > >
> > > &qspi_cs0 {
> > > @@ -428,3 +438,77 @@
> > > bias-pull-up;
> > > };
> > > };
> > > +&qup_uart7_cts {
> > > + /*
> > > + * Configure a pull-down on CTS to match the pull of
> > > + * the Bluetooth module.
> > > + */
> > > + bias-pull-down;
> > > +};
> > > +
> > > +&qup_uart7_rts {
> > > + /* We'll drive RTS, so no pull */
> > > + drive-strength = <2>;
> > > + bias-disable;
> > > +};
> > > +
> > > +&qup_uart7_tx {
> > > + /* We'll drive TX, so no pull */
> > > + drive-strength = <2>;
> > > + bias-disable;
> > > +};
> > > +
> > > +&qup_uart7_rx {
> > > + /*
> > > + * Configure a pull-up on RX. This is needed to avoid
> > > + * garbage data when the TX pin of the Bluetooth module is
> > > + * in tri-state (module powered off or not driving the
> > > + * signal yet).
> > > + */
> > > + bias-pull-up;
> > > +};
> > > +
> > > +&tlmm {
> > > + qup_uart7_sleep_cts: qup-uart7-sleep-cts {
> > > + pins = "gpio28";
> > > + function = "gpio";
> > > + /*
> > > + * Configure a pull-down on CTS to match the pull of
> > > + * the Bluetooth module.
> > > + */
> > > + bias-pull-down;
> > > + };
> > > +
> > > + qup_uart7_sleep_rts: qup-uart7-sleep-rts {
> > > + pins = "gpio29";
> > > + function = "gpio";
> > > + /*
> > > + * Configure pull-down on RTS. As RTS is active low
> > > + * signal, pull it low to indicate the BT SoC that it
> > > + * can wakeup the system anytime from suspend state by
> > > + * pulling RX low (by sending wakeup bytes).
> > > + */
> > > + bias-pull-down;
> > > + };
> > > +
> > > + qup_uart7_sleep_tx: qup-uart7-sleep-tx {
> > > + pins = "gpio30";
> > > + function = "gpio";
> > > + /*
> > > + * Configure pull-up on TX when it isn't actively driven
> > > + * to prevent BT SoC from receiving garbage during sleep.
> > > + */
> > > + bias-pull-up;
> > > + };
> > >
> > > + qup_uart7_sleep_rx: qup-uart7-sleep-rx {
> > > + pins = "gpio31";
> > > + function = "gpio";
> > > + /*
> > > + * Configure a pull-up on RX. This is needed to avoid
> > > + * garbage data when the TX pin of the Bluetooth module
> > > + * is floating which may cause spurious wakeups.
> > > + */
> > > + bias-pull-up;
> > > + };
> > > +};
> >
> > How the patches of this series are split strikes me as a bit odd.
> > Supposedly
> > this patch adds the QUPv3 wrapper_0 DT nodes for the SC7280, however the
> > above is the pin configuration for the Bluetooth UART of the SC7280 IDP
> > board.
> > I don't see a good reason why that should be part of this patch. It
> > should be
> > a separate change whose subject indicates that it configures the
> > Bluetooth UART
> > of the SC7280 IDP.
> >
>
> Okay will split this up.
>
> > Without this conflation of SoC and board DT it would seem perfectly
> > reasonable
> > to squash this patch and '[4/4] arm64: dts: sc7280: Add QUPv3 wrapper_1
> > nodes'
> > into a single one, they are essentially doing the same thing, I see no
> > need to
> > have different patches for the wrapper 0 and 1 nodes.
>
> Previously when QUP wrapper 0 and wrapper 1 nodes were added in single
> patch, we faced some git issues as the patch was huge. Hence we split it up.
> https://partnerissuetracker.corp.google.com/issues/177045897#comment12
That bug tracker entry isn't public, this is what the comment says:
> I suspect that diff is just having a hard time since your patch touches so
> much stuff. Presumably you could make it happier if you broke your patch
> into smaller changes. For instance:
>
> One patch that adds the quad SPI. After all the quad SPI isn't really
> related to the other QUP stuff. One patch that fixes up the existing
> "uart5" and the QUP it's on to be how it's supposed to be. One patch
> that adds all the new stuff.
If I understand correctly the problem wasn't that the QUP wrappers are
added in a single patch (which should be pretty straightforward to
review), but that the previous patch(es) do too many things at once.
Adding both QUP wrappers is conceptionally a single thing, the problem
is intermingling that with adding board specific Bluetooth nodes, board
flash nodes, pinconf for UART, etc
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