linux-kernel - RE: [PATCH 2/2] pci: Add PCIe driver for Rockchip Soc

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Date:	Mon, 23 May 2016 15:15:20 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Heiko Stuebner <heiko@...ech.de>,
	Wenrui Li <wenrui.li@...k-chips.com>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Doug Anderson <dianders@...omium.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-rockchip@...ts.infradead.org" 
	<linux-rockchip@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] pci: Add PCIe driver for Rockchip Soc

> +
> +	irq = platform_get_irq_byname(pdev, "pcie-sys");
> +	if (irq < 0) {
> +		dev_err(dev, "missing pcie_sys IRQ resource\n");
> +		return -EINVAL;
> +	}
> +	err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler,
> +			       IRQF_SHARED, "pcie-sys", port);
> +	if (err) {
> +		dev_err(dev, "failed to request pcie subsystem irq\n");
> +		return err;
> +	}
> +
> +	port->irq = platform_get_irq_byname(pdev, "pcie-legacy");
> +	if (port->irq < 0) {
> +		dev_err(dev, "missing pcie_legacy IRQ resource\n");
> +		return -EINVAL;
> +	}
> +	err = devm_request_irq(dev, port->irq,
> +			       rockchip_pcie_legacy_int_handler,
> +			       IRQF_SHARED,
> +			       "pcie-legacy",
> +			       port);
> +	if (err) {
> +		dev_err(&pdev->dev, "failed to request pcie-legacy irq\n");
> +		return err;
> +	}
> +
> +	irq = platform_get_irq_byname(pdev, "pcie-client");
> +	if (irq < 0) {
> +		dev_err(dev, "missing pcie-client IRQ resource\n");
> +		return -EINVAL;
> +	}
> +	err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler,
> +			       IRQF_SHARED, "pcie-client", port);
> +	if (err) {
> +		dev_err(dev, "failed to request pcie client irq\n");
> +		return err;
> +	}
> +

All of the above interrupt number details are being obtained from device tree, why not move above API's to rockchip_pcie_parse_dt.

> +	port->dev = dev;
> +	err = rockchip_pcie_parse_dt(port);
> +	if (err) {
> +		dev_err(dev, "Parsing DT failed\n");
> +		return err;
> +	}
> +
> +	pcie_write(port, 0x6040000, PCIE_RC_CONFIG_BASE + 0x8);
> +	pcie_write(port, 0x0, PCIE_CORE_CTRL_MGMT_BASE + 0x300);
> +
> +	pcie_write(port, (RC_REGION_0_ADDR_TRANS_L +
> RC_REGION_0_PASS_BITS),
> +		   PCIE_CORE_AXI_CONF_BASE);
> +	pcie_write(port, RC_REGION_0_ADDR_TRANS_H,
> +		   PCIE_CORE_AXI_CONF_BASE + 0x4);
> +	pcie_write(port, 0x0080000a, PCIE_CORE_AXI_CONF_BASE + 0x8);
> +	pcie_write(port, 0x00000000, PCIE_CORE_AXI_CONF_BASE + 0xc);

Why not move the above steps to rockchip_pcie_init_port function ? 
Please use macros instead of using values.