linux-kernel - Re: [PATCH 7/7] PCI: apple: Add T602x PCIe support

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Message-ID: <CAL_JsqJ-sYsy-11_UiEKrKok49-a-VJUvm3vBGbpu9vY3TKLUw@mail.gmail.com>
Date: Thu, 13 Feb 2025 11:56:19 -0600
From: Rob Herring <robh@...nel.org>
To: Alyssa Rosenzweig <alyssa@...enzweig.io>
Cc: Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Mark Kettenis <kettenis@...nbsd.org>, 
	Marc Zyngier <maz@...nel.org>, Stan Skowronek <stan@...ellium.com>, asahi@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] PCI: apple: Add T602x PCIe support

On Tue, Feb 11, 2025 at 1:54 PM Alyssa Rosenzweig <alyssa@...enzweig.io> wrote:
>
> From: Hector Martin <marcan@...can.st>
>
> This version of the hardware moved around a bunch of registers, so we
> drop the old compatible for these and introduce register offset
> structures to handle the differences.
>
> Signed-off-by: Hector Martin <marcan@...can.st>
> Signed-off-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
> ---
>  drivers/pci/controller/pcie-apple.c | 125 ++++++++++++++++++++++++++++++------
>  1 file changed, 105 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index 7f4839fb0a5b15a9ca87337f53c14a1ce08301fc..7c598334427cb56ca066890ac61143ae1d3ed744 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -26,6 +26,7 @@
>  #include <linux/list.h>
>  #include <linux/module.h>
>  #include <linux/msi.h>
> +#include <linux/of_device.h>

Drivers should not need this...

> +const struct reg_info t602x_hw = {
> +       .phy_lane_ctl = 0,
> +       .port_msiaddr = PORT_T602X_MSIADDR,
> +       .port_msiaddr_hi = PORT_T602X_MSIADDR_HI,
> +       .port_refclk = 0,
> +       .port_perst = PORT_T602X_PERST,
> +       .port_rid2sid = PORT_T602X_RID2SID,
> +       .port_msimap = PORT_T602X_MSIMAP,
> +       .max_rid2sid = 512, /* 16 on t602x, guess for autodetect on future HW */
> +       .max_msimap = 512, /* 96 on t602x, guess for autodetect on future HW */
> +};
> +
> +static const struct of_device_id apple_pcie_of_match_hw[] = {
> +       { .compatible = "apple,t6020-pcie", .data = &t602x_hw },
> +       { .compatible = "apple,pcie", .data = &t8103_hw },
> +       { }
> +};

You should not have 2 match tables.

> @@ -750,13 +828,19 @@ static int apple_pcie_init(struct pci_config_window *cfg)
>         struct platform_device *platform = to_platform_device(dev);
>         struct device_node *of_port;
>         struct apple_pcie *pcie;
> +       const struct of_device_id *match;
>         int ret;
>
> +       match = of_match_device(apple_pcie_of_match_hw, dev);
> +       if (!match)
> +               return -ENODEV;
> +
>         pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
>         if (!pcie)
>                 return -ENOMEM;
>
>         pcie->dev = dev;
> +       pcie->hw = match->data;
>
>         mutex_init(&pcie->lock);
>
> @@ -795,6 +879,7 @@ static const struct pci_ecam_ops apple_pcie_cfg_ecam_ops = {
>  };
>
>  static const struct of_device_id apple_pcie_of_match[] = {
> +       { .compatible = "apple,t6020-pcie", .data = &apple_pcie_cfg_ecam_ops },
>         { .compatible = "apple,pcie", .data = &apple_pcie_cfg_ecam_ops },
>         { }

You are going to need to merge the data to 1 struct.

And then use (of_)?device_get_match_data() in probe().

Rob