linux-kernel - Re: [PATCH RESEND v5 07/14] PCI: visconti: Convert to using generic resources getter

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Message-ID: <20230517052931.GB4868@thinkpad>
Date:   Wed, 17 May 2023 10:59:31 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RESEND v5 07/14] PCI: visconti: Convert to using generic
 resources getter

On Thu, May 11, 2023 at 10:08:55PM +0300, Serge Semin wrote:
> The generic resources request infrastructure has been recently added to
> the DW PCIe core driver. Since the DT-bindings of the Toshibo Visconti
> PCIe Host controller is fully compatible with the generic names set let's
> convert the driver to using that infrastructure. It won't take much effort
> since the low-level device driver implies the resources request only with
> no additional manipulations involving them. So just drop the locally
> defined clocks request procedures, activate the generic resources request
> capability and make sure the mandatory resources have been requested by
> the DW PCIe core driver.
> 
> Suggested-by: Bjorn Helgaas <helgaas@...nel.org>
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  drivers/pci/controller/dwc/pcie-visconti.c | 37 ++++++++++------------
>  1 file changed, 17 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-visconti.c b/drivers/pci/controller/dwc/pcie-visconti.c
> index 71026fefa366..ae1517b52c58 100644
> --- a/drivers/pci/controller/dwc/pcie-visconti.c
> +++ b/drivers/pci/controller/dwc/pcie-visconti.c
> @@ -29,9 +29,6 @@ struct visconti_pcie {
>  	void __iomem *ulreg_base;
>  	void __iomem *smu_base;
>  	void __iomem *mpu_base;
> -	struct clk *refclk;
> -	struct clk *coreclk;
> -	struct clk *auxclk;
>  };
>  
>  #define PCIE_UL_REG_S_PCIE_MODE		0x00F4
> @@ -198,6 +195,21 @@ static int visconti_pcie_host_init(struct dw_pcie_rp *pp)
>  	int err;
>  	u32 val;
>  
> +	if (!pcie->pci.core_clks[DW_PCIE_REF_CLK].clk) {
> +		dev_err(pci->dev, "Missing ref clock source\n");
> +		return -ENOENT;
> +	}
> +
> +	if (!pcie->pci.core_clks[DW_PCIE_CORE_CLK].clk) {
> +		dev_err(pci->dev, "Missing core clock source\n");
> +		return -ENOENT;
> +	}
> +
> +	if (!pcie->pci.core_clks[DW_PCIE_AUX_CLK].clk) {
> +		dev_err(pci->dev, "Missing aux clock source\n");
> +		return -ENOENT;
> +	}
> +
>  	visconti_smu_writel(pcie,
>  			    PISMU_CKON_PCIE_AUX_CLK | PISMU_CKON_PCIE_MSTR_ACLK,
>  			    PISMU_CKON_PCIE);
> @@ -242,8 +254,6 @@ static const struct dw_pcie_host_ops visconti_pcie_host_ops = {
>  static int visconti_get_resources(struct platform_device *pdev,
>  				  struct visconti_pcie *pcie)
>  {
> -	struct device *dev = &pdev->dev;
> -
>  	pcie->ulreg_base = devm_platform_ioremap_resource_byname(pdev, "ulreg");
>  	if (IS_ERR(pcie->ulreg_base))
>  		return PTR_ERR(pcie->ulreg_base);
> @@ -256,21 +266,6 @@ static int visconti_get_resources(struct platform_device *pdev,
>  	if (IS_ERR(pcie->mpu_base))
>  		return PTR_ERR(pcie->mpu_base);
>  
> -	pcie->refclk = devm_clk_get(dev, "ref");
> -	if (IS_ERR(pcie->refclk))
> -		return dev_err_probe(dev, PTR_ERR(pcie->refclk),
> -				     "Failed to get ref clock\n");
> -
> -	pcie->coreclk = devm_clk_get(dev, "core");
> -	if (IS_ERR(pcie->coreclk))
> -		return dev_err_probe(dev, PTR_ERR(pcie->coreclk),
> -				     "Failed to get core clock\n");
> -
> -	pcie->auxclk = devm_clk_get(dev, "aux");
> -	if (IS_ERR(pcie->auxclk))
> -		return dev_err_probe(dev, PTR_ERR(pcie->auxclk),
> -				     "Failed to get aux clock\n");
> -
>  	return 0;
>  }
>  
> @@ -304,6 +299,8 @@ static int visconti_pcie_probe(struct platform_device *pdev)
>  	pci->dev = dev;
>  	pci->ops = &dw_pcie_ops;
>  
> +	dw_pcie_cap_set(pci, REQ_RES);
> +
>  	ret = visconti_get_resources(pdev, pcie);
>  	if (ret)
>  		return ret;
> -- 
> 2.40.0
> 
> 

-- 
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