linux-kernel - Re: [PATCH v4 RESEND 0/8] ipq9574: Enable PCI-Express support

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Date: Sun, 12 May 2024 14:05:18 +0530
From: Devi Priya <quic_devipriy@...cinc.com>
To: <mr.nuke.me@...il.com>, Bjorn Andersson <andersson@...nel.org>,
        Konrad
 Dybcio <konrad.dybcio@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring
	<robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Vinod Koul
	<vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Michael
 Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v4 RESEND 0/8] ipq9574: Enable PCI-Express support



On 5/8/2024 10:40 PM, mr.nuke.me@...il.com wrote:
> On 5/8/24 1:16 AM, Devi Priya wrote:
>>
>>
>> On 5/1/2024 9:58 AM, Alexandru Gagniuc wrote:
>>> There are four PCIe ports on IPQ9574, pcie0 thru pcie3. This series
>>> addresses pcie2, which is a gen3x2 port. The board I have only uses
>>> pcie2, and that's the only one enabled in this series. pcie3 is added
>>> as a special request, but is untested.
>>>
>>> I believe this makes sense as a monolithic series, as the individual
>>> pieces are not that useful by themselves.
>>
>> Hi Alexandru,
>>
>> As Dmitry suggested, we are working on enabling the PCIe NOC clocks
>> via Interconnect. We will be posting the PCIe series with
>> Interconnect support [1] shortly.
> 
> I am generally very hesitant to depend on unmerged series, as this can 
> cause undue delays. In this particular case, I considered that both 
> series can continue to stay independent, with the ability to convert the 
> PCIe users to the new clock scheme when the time is right.
> 
>> [1] - 
>> https://lore.kernel.org/linux-arm-msm/20240430064214.2030013-1-quic_varada@quicinc.com/
> 
> What changes would be needed to this series to make use of this? How 
> does one use the "interconnected" clocks?
> 
> Alex
Hi Alex,

Please refer to the latest PCIe series which adds support for enabling
the NoC clocks via interconnect.

https://lore.kernel.org/linux-arm-msm/20240512082858.1806694-1-quic_devipriy@quicinc.com/

Thanks & Regards,
S.Devi Priya
> 
>> Thanks,
>> S.Devi Priya
>>>
>>> In v2, I've had some issues regarding the dt schema checks. For
>>> transparency, I used the following test invocations to test:
>>>
>>>        make dt_binding_check 
>>> DT_SCHEMA_FILES=qcom,pcie.yaml:qcom,ipq8074-qmp-pcie-phy.yaml
>>>        make dtbs_check 
>>> DT_SCHEMA_FILES=qcom,pcie.yaml:qcom,ipq8074-qmp-pcie-phy.yaml
>>>
>>> Changes since v3:
>>>   - "const"ify .hw.init fields for the PCIE pipe clocks
>>>   - Used pciephy_v5_regs_layout instead of v4 in phy-qcom-qmp-pcie.c
>>>   - Included Manivannan's patch for qcom-pcie.c clocks
>>>   - Dropped redundant comments in "ranges" and "interrupt-map" of pcie2.
>>>   - Added pcie3 and pcie3_phy dts nodes
>>>   - Moved snoc and anoc clocks to PCIe controller from PHY
>>>
>>> Changes since v2:
>>>   - reworked resets in qcom,pcie.yaml to resolve dt schema errors
>>>   - constrained "reg" in qcom,pcie.yaml
>>>   - reworked min/max intems in qcom,ipq8074-qmp-pcie-phy.yaml
>>>   - dropped msi-parent for pcie node, as it is handled by "msi" IRQ
>>>
>>> Changes since v1:
>>>   - updated new tables in phy-qcom-qmp-pcie.c to use lowercase hex 
>>> numbers
>>>   - reorganized qcom,ipq8074-qmp-pcie-phy.yaml to use a single list 
>>> of clocks
>>>   - reorganized qcom,pcie.yaml to include clocks+resets per compatible
>>>   - Renamed "pcie2_qmp_phy" label to "pcie2_phy"
>>>   - moved "ranges" property of pcie@...00000 higher up
>>>
>>> Alexandru Gagniuc (7):
>>>    dt-bindings: clock: Add PCIe pipe related clocks for IPQ9574
>>>    clk: qcom: gcc-ipq9574: Add PCIe pipe clocks
>>>    dt-bindings: PCI: qcom: Add IPQ9574 PCIe controller
>>>    PCI: qcom: Add support for IPQ9574
>>>    dt-bindings: phy: qcom,ipq8074-qmp-pcie: add ipq9574 gen3x2 PHY
>>>    phy: qcom-qmp-pcie: add support for ipq9574 gen3x2 PHY
>>>    arm64: dts: qcom: ipq9574: add PCIe2 and PCIe3 nodes
>>>
>>> Manivannan Sadhasivam (1):
>>>    PCI: qcom: Switch to devm_clk_bulk_get_all() API to get the clocks
>>>      from Devicetree
>>>
>>>   .../devicetree/bindings/pci/qcom,pcie.yaml    |  37 ++++
>>>   .../phy/qcom,ipq8074-qmp-pcie-phy.yaml        |   1 +
>>>   arch/arm64/boot/dts/qcom/ipq9574.dtsi         | 178 +++++++++++++++++-
>>>   drivers/clk/qcom/gcc-ipq9574.c                |  76 ++++++++
>>>   drivers/pci/controller/dwc/pcie-qcom.c        | 164 +++-------------
>>>   drivers/phy/qualcomm/phy-qcom-qmp-pcie.c      | 136 ++++++++++++-
>>>   .../phy/qualcomm/phy-qcom-qmp-pcs-pcie-v5.h   |  14 ++
>>>   include/dt-bindings/clock/qcom,ipq9574-gcc.h  |   4 +
>>>   8 files changed, 469 insertions(+), 141 deletions(-)
>>>