linux-kernel - Re: [PATCH v2 4/7] PCI: qcom: Add support for IPQ9574

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Message-ID: <20240417070517.GA3894@thinkpad>
Date: Wed, 17 Apr 2024 12:35:17 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Alexandru Gagniuc <mr.nuke.me@...il.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] PCI: qcom: Add support for IPQ9574

On Wed, Apr 10, 2024 at 01:50:26PM +0200, Konrad Dybcio wrote:
> 
> 
> On 4/9/24 21:08, Alexandru Gagniuc wrote:
> > Add support for the PCIe on IPQ9574. The main difference from ipq6018
> > is that the "iface" clock is not necessarry. Add a special case in
> > qcom_pcie_get_resources_2_9_0() to handle this.
> > 
> > Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> > Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > ---
> >   drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++----
> >   1 file changed, 9 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> > index 14772edcf0d3..10560d6d6336 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -1101,15 +1101,19 @@ static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
> >   	struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
> >   	struct dw_pcie *pci = pcie->pci;
> >   	struct device *dev = pci->dev;
> > -	int ret;
> > +	int ret, num_clks = ARRAY_SIZE(res->clks) - 1;
> > -	res->clks[0].id = "iface";
> > +	res->clks[0].id = "rchng";
> >   	res->clks[1].id = "axi_m";
> >   	res->clks[2].id = "axi_s";
> >   	res->clks[3].id = "axi_bridge";
> > -	res->clks[4].id = "rchng";
> > -	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
> > +	if (!of_device_is_compatible(dev->of_node, "qcom,pcie-ipq9574")) {
> > +		res->clks[4].id = "iface";
> > +		num_clks++;
> 
> Or use devm_clk_bulk_get_optional and rely on the bindings to sanity-check.
> 
> Mani, thoughts?
> 

I'd prefer to use devm_clk_bulk_get_all() and just rely on DT schema to do the
validation. There was a patch hanging in my branch for some time and I sent it
now: https://lore.kernel.org/linux-pci/20240417-pci-qcom-clk-bulk-v1-1-52ca19b3d6b2@linaro.org/

- Mani

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