Re: [PATCH v8 2/5] PCI: rcar-gen4: Add rcar_gen4_pcie_drvdata

[Bjorn Helgaas <helgaas@kernel.org>]

On Mon, May 20, 2024 at 04:42:57PM +0900, Yoshihiro Shimoda wrote:
> In other to support future SoCs such as r8a779g0 and r8a779h0 that
> require different initialization settings, let's introduce SoC
> specific driver data with the initial member being the device mode.
> No functional change.

s/In other to/To/ or s/In other/In order/ if you prefer.
s/let's//

Whoever applies this can tweak it, no need to repost for this.

> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  drivers/pci/controller/dwc/pcie-rcar-gen4.c | 32 +++++++++++++++------
>  1 file changed, 23 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
> index 0be760ed420b..b11e09505b0b 100644
> --- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
> +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
> @@ -48,11 +48,15 @@
>  #define RCAR_GEN4_PCIE_EP_FUNC_DBI_OFFSET	0x1000
>  #define RCAR_GEN4_PCIE_EP_FUNC_DBI2_OFFSET	0x800
>  
> +struct rcar_gen4_pcie_drvdata {
> +	enum dw_pcie_device_mode mode;
> +};
> +
>  struct rcar_gen4_pcie {
>  	struct dw_pcie dw;
>  	void __iomem *base;
>  	struct platform_device *pdev;
> -	enum dw_pcie_device_mode mode;
> +	const struct rcar_gen4_pcie_drvdata *drvdata;
>  };
>  #define to_rcar_gen4_pcie(_dw)	container_of(_dw, struct rcar_gen4_pcie, dw)
>  
> @@ -137,7 +141,7 @@ static int rcar_gen4_pcie_start_link(struct dw_pcie *dw)
>  	 * Since dw_pcie_setup_rc() sets it once, PCIe Gen2 will be trained.
>  	 * So, this needs remaining times for up to PCIe Gen4 if RC mode.
>  	 */
> -	if (changes && rcar->mode == DW_PCIE_RC_TYPE)
> +	if (changes && rcar->drvdata->mode == DW_PCIE_RC_TYPE)
>  		changes--;
>  
>  	for (i = 0; i < changes; i++) {
> @@ -172,9 +176,9 @@ static int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar)
>  		reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc);
>  
>  	val = readl(rcar->base + PCIEMSR0);
> -	if (rcar->mode == DW_PCIE_RC_TYPE) {
> +	if (rcar->drvdata->mode == DW_PCIE_RC_TYPE) {
>  		val |= DEVICE_TYPE_RC;
> -	} else if (rcar->mode == DW_PCIE_EP_TYPE) {
> +	} else if (rcar->drvdata->mode == DW_PCIE_EP_TYPE) {
>  		val |= DEVICE_TYPE_EP;
>  	} else {
>  		ret = -EINVAL;
> @@ -437,9 +441,11 @@ static void rcar_gen4_remove_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
>  /* Common */
>  static int rcar_gen4_add_dw_pcie(struct rcar_gen4_pcie *rcar)
>  {
> -	rcar->mode = (uintptr_t)of_device_get_match_data(&rcar->pdev->dev);
> +	rcar->drvdata = of_device_get_match_data(&rcar->pdev->dev);
> +	if (!rcar->drvdata)
> +		return -EINVAL;
>  
> -	switch (rcar->mode) {
> +	switch (rcar->drvdata->mode) {
>  	case DW_PCIE_RC_TYPE:
>  		return rcar_gen4_add_dw_pcie_rp(rcar);
>  	case DW_PCIE_EP_TYPE:
> @@ -480,7 +486,7 @@ static int rcar_gen4_pcie_probe(struct platform_device *pdev)
>  
>  static void rcar_gen4_remove_dw_pcie(struct rcar_gen4_pcie *rcar)
>  {
> -	switch (rcar->mode) {
> +	switch (rcar->drvdata->mode) {
>  	case DW_PCIE_RC_TYPE:
>  		rcar_gen4_remove_dw_pcie_rp(rcar);
>  		break;
> @@ -500,14 +506,22 @@ static void rcar_gen4_pcie_remove(struct platform_device *pdev)
>  	rcar_gen4_pcie_unprepare(rcar);
>  }
>  
> +static struct rcar_gen4_pcie_drvdata drvdata_rcar_gen4_pcie = {
> +	.mode = DW_PCIE_RC_TYPE,
> +};
> +
> +static struct rcar_gen4_pcie_drvdata drvdata_rcar_gen4_pcie_ep = {
> +	.mode = DW_PCIE_EP_TYPE,
> +};
> +
>  static const struct of_device_id rcar_gen4_pcie_of_match[] = {
>  	{
>  		.compatible = "renesas,rcar-gen4-pcie",
> -		.data = (void *)DW_PCIE_RC_TYPE,
> +		.data = &drvdata_rcar_gen4_pcie,
>  	},
>  	{
>  		.compatible = "renesas,rcar-gen4-pcie-ep",
> -		.data = (void *)DW_PCIE_EP_TYPE,
> +		.data = &drvdata_rcar_gen4_pcie_ep,
>  	},
>  	{},
>  };
> -- 
> 2.25.1
>