linux-kernel - Re: [PATCH v3 1/3] PCI: qcom: Use clk

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Message-ID: <20190529005851.GA3923@builder>
Date:   Tue, 28 May 2019 17:58:51 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stanimir Varbanov <svarbanov@...sol.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] PCI: qcom: Use clk_bulk API for 2.4.0 controllers

On Thu 16 May 02:14 PDT 2019, Stanimir Varbanov wrote:

> Hi Bjorn,
> 
> On 5/2/19 3:19 AM, Bjorn Andersson wrote:
> > Before introducing the QCS404 platform, which uses the same PCIe
> > controller as IPQ4019, migrate this to use the bulk clock API, in order
> > to make the error paths slighly cleaner.
> > 
> > Acked-by: Stanimir Varbanov <svarbanov@...sol.com>
> > Reviewed-by: Niklas Cassel <niklas.cassel@...aro.org>
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> > 
> > Changes since v2:
> > - Defined QCOM_PCIE_2_4_0_MAX_CLOCKS
> > 
> >  drivers/pci/controller/dwc/pcie-qcom.c | 49 ++++++++------------------
> >  1 file changed, 14 insertions(+), 35 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> > index 0ed235d560e3..d740cbe0e56d 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -112,10 +112,10 @@ struct qcom_pcie_resources_2_3_2 {
> >  	struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
> >  };
> >  
> > +#define QCOM_PCIE_2_4_0_MAX_CLOCKS	3
> >  struct qcom_pcie_resources_2_4_0 {
> > -	struct clk *aux_clk;
> > -	struct clk *master_clk;
> > -	struct clk *slave_clk;
> > +	struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
> > +	int num_clks;
> >  	struct reset_control *axi_m_reset;
> >  	struct reset_control *axi_s_reset;
> >  	struct reset_control *pipe_reset;
> > @@ -638,18 +638,17 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
> >  	struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
> >  	struct dw_pcie *pci = pcie->pci;
> >  	struct device *dev = pci->dev;
> > +	int ret;
> >  
> > -	res->aux_clk = devm_clk_get(dev, "aux");
> > -	if (IS_ERR(res->aux_clk))
> > -		return PTR_ERR(res->aux_clk);
> > +	res->clks[0].id = "aux";
> > +	res->clks[1].id = "master_bus";
> > +	res->clks[2].id = "slave_bus";
> >  
> > -	res->master_clk = devm_clk_get(dev, "master_bus");
> > -	if (IS_ERR(res->master_clk))
> > -		return PTR_ERR(res->master_clk);
> > +	res->num_clks = 3;
> 
> Use the new fresh define QCOM_PCIE_2_4_0_MAX_CLOCKS?
> 

As I replace it in patch 3/3 with a value different from "max clocks", I
don't think it makes sense to use the define here. So I'm leaving this
as is.

> >  
> > -	res->slave_clk = devm_clk_get(dev, "slave_bus");
> > -	if (IS_ERR(res->slave_clk))
> > -		return PTR_ERR(res->slave_clk);
> > +	ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
> > +	if (ret < 0)
> > +		return ret;
> >  
> >  	res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m");
> >  	if (IS_ERR(res->axi_m_reset))
> > @@ -719,9 +718,7 @@ static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
> >  	reset_control_assert(res->axi_m_sticky_reset);
> >  	reset_control_assert(res->pwr_reset);
> >  	reset_control_assert(res->ahb_reset);
> > -	clk_disable_unprepare(res->aux_clk);
> > -	clk_disable_unprepare(res->master_clk);
> > -	clk_disable_unprepare(res->slave_clk);
> > +	clk_bulk_disable_unprepare(res->num_clks, res->clks);
> >  }
> >  
> >  static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
> > @@ -850,23 +847,9 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
> >  
> >  	usleep_range(10000, 12000);
> >  
> > -	ret = clk_prepare_enable(res->aux_clk);
> > -	if (ret) {
> > -		dev_err(dev, "cannot prepare/enable iface clock\n");
> > +	ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
> > +	if (ret)
> >  		goto err_clk_aux;
> 
> Maybe you have to change the name of the label too?
> 

Updated this and posted v5. Should be good to be merged now.

Thanks for your reviews!

Regards,
Bjorn