Re: [PATCH v5 2/4] PCI: mediatek: Use regmap to get shared pcie-cfg base

[Matthias Brugger <matthias.bgg@gmail.com>]

On 10/09/2020 08:11, Chuanjia Liu wrote:
> Use regmap to get shared pcie-cfg base and change
> the method to get pcie irq.
> 
> Acked-by: Ryder Lee <ryder.lee@mediatek.com>
> Signed-off-by: Chuanjia Liu <chuanjia.liu@mediatek.com>
> ---
>   drivers/pci/controller/pcie-mediatek.c | 25 ++++++++++++++++++-------
>   1 file changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index cf4c18f0c25a..987845d19982 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -14,6 +14,7 @@
>   #include <linux/irqchip/chained_irq.h>
>   #include <linux/irqdomain.h>
>   #include <linux/kernel.h>
> +#include <linux/mfd/syscon.h>
>   #include <linux/msi.h>
>   #include <linux/module.h>
>   #include <linux/of_address.h>
> @@ -23,6 +24,7 @@
>   #include <linux/phy/phy.h>
>   #include <linux/platform_device.h>
>   #include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
>   #include <linux/reset.h>
>   
>   #include "../pci.h"
> @@ -205,6 +207,7 @@ struct mtk_pcie_port {
>    * struct mtk_pcie - PCIe host information
>    * @dev: pointer to PCIe device
>    * @base: IO mapped register base
> + * @cfg: IO mapped register map for PCIe config
>    * @free_ck: free-run reference clock
>    * @mem: non-prefetchable memory resource
>    * @ports: pointer to PCIe port information
> @@ -213,6 +216,7 @@ struct mtk_pcie_port {
>   struct mtk_pcie {
>   	struct device *dev;
>   	void __iomem *base;
> +	struct regmap *cfg;
>   	struct clk *free_ck;
>   
>   	struct list_head ports;
> @@ -648,7 +652,7 @@ static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
>   		return err;
>   	}
>   
> -	port->irq = platform_get_irq(pdev, port->slot);
> +	port->irq = platform_get_irq_byname(pdev, "pcie_irq");
>   	if (port->irq < 0)
>   		return port->irq;

You will need to make sure taht the driver keeps working with the old DTS 
format. This is not the case here.

Regards,
Matthias

>   
> @@ -674,12 +678,11 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
>   	if (!mem)
>   		return -EINVAL;
>   
> -	/* MT7622 platforms need to enable LTSSM and ASPM from PCIe subsys */
> -	if (pcie->base) {
> -		val = readl(pcie->base + PCIE_SYS_CFG_V2);
> -		val |= PCIE_CSR_LTSSM_EN(port->slot) |
> -		       PCIE_CSR_ASPM_L1_EN(port->slot);
> -		writel(val, pcie->base + PCIE_SYS_CFG_V2);
> +	/* MT7622/MT7629 platforms need to enable LTSSM and ASPM. */
> +	if (pcie->cfg) {
> +		val = PCIE_CSR_LTSSM_EN(port->slot) |
> +		      PCIE_CSR_ASPM_L1_EN(port->slot);
> +		regmap_update_bits(pcie->cfg, PCIE_SYS_CFG_V2, val, val);
>   	}
>   
>   	/* Assert all reset signals */
> @@ -983,6 +986,7 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
>   	struct device *dev = pcie->dev;
>   	struct platform_device *pdev = to_platform_device(dev);
>   	struct resource *regs;
> +	struct device_node *cfg_node;
>   	int err;
>   
>   	/* get shared registers, which are optional */
> @@ -995,6 +999,13 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
>   		}
>   	}
>   
> +	cfg_node = of_parse_phandle(dev->of_node, "mediatek,pcie-cfg", 0);
> +	if (cfg_node) {
> +		pcie->cfg = syscon_node_to_regmap(cfg_node);
> +		if (IS_ERR(pcie->cfg))
> +			return PTR_ERR(pcie->cfg);
> +	}
> +
>   	pcie->free_ck = devm_clk_get(dev, "free_ck");
>   	if (IS_ERR(pcie->free_ck)) {
>   		if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)
> 

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