linux-kernel - [PATCH 1/2] PCI: rcar: Add dev struct for of_device_get_match

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Date:   Tue, 21 Jun 2022 21:57:31 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     Liang He <windhl@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 1/2] PCI: rcar: Add dev struct for of_device_get_match_data()

From: Bjorn Helgaas <bhelgaas@...gle.com>

Add a struct rcar_variant to hold details about differences between the
different R-Car variants we support.  No functional change intended.

The benefit is that we can find all this information with the existing
single of_device_get_match_data() call.  A subsequent commit will remove
an of_find_matching_node() call by extending this structure.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Liang He <windhl@....com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 drivers/pci/controller/pcie-rcar-host.c | 53 +++++++++++++++----------
 1 file changed, 33 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index 997c4df6a1e7..ccf13aafa1e5 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -56,13 +56,19 @@ static void __iomem *pcie_base;
 static struct device *pcie_dev;
 #endif
 
+struct rcar_pcie_host;
+
+struct rcar_variant {
+	int	(*phy_init_fn)(struct rcar_pcie_host *host);
+};
+
 /* Structure representing the PCIe interface */
 struct rcar_pcie_host {
-	struct rcar_pcie	pcie;
-	struct phy		*phy;
-	struct clk		*bus_clk;
-	struct			rcar_msi msi;
-	int			(*phy_init_fn)(struct rcar_pcie_host *host);
+	struct rcar_pcie	  pcie;
+	struct phy		  *phy;
+	struct clk		  *bus_clk;
+	struct rcar_msi		  msi;
+	const struct rcar_variant *variant;
 };
 
 static DEFINE_SPINLOCK(pmsr_lock);
@@ -958,19 +964,26 @@ static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie_host *host)
 	return err;
 }
 
+static const struct rcar_variant rcar_h1_data = {
+	.phy_init_fn = rcar_pcie_phy_init_h1,
+};
+
+static const struct rcar_variant rcar_gen2_data = {
+	.phy_init_fn = rcar_pcie_phy_init_gen2,
+};
+
+static const struct rcar_variant rcar_gen3_data = {
+	.phy_init_fn = rcar_pcie_phy_init_gen3,
+};
+
 static const struct of_device_id rcar_pcie_of_match[] = {
-	{ .compatible = "renesas,pcie-r8a7779",
-	  .data = rcar_pcie_phy_init_h1 },
-	{ .compatible = "renesas,pcie-r8a7790",
-	  .data = rcar_pcie_phy_init_gen2 },
-	{ .compatible = "renesas,pcie-r8a7791",
-	  .data = rcar_pcie_phy_init_gen2 },
-	{ .compatible = "renesas,pcie-rcar-gen2",
-	  .data = rcar_pcie_phy_init_gen2 },
-	{ .compatible = "renesas,pcie-r8a7795",
-	  .data = rcar_pcie_phy_init_gen3 },
-	{ .compatible = "renesas,pcie-rcar-gen3",
-	  .data = rcar_pcie_phy_init_gen3 },
+	{ .compatible = "renesas,pcie-r8a7779",   .data = &rcar_h1_data },
+	{ .compatible = "renesas,pcie-r8a7790",   .data = &rcar_gen2_data },
+	{ .compatible = "renesas,pcie-r8a7791",   .data = &rcar_gen2_data },
+	{ .compatible = "renesas,pcie-rcar-gen2", .data = &rcar_gen2_data },
+
+	{ .compatible = "renesas,pcie-r8a7795",   .data = &rcar_gen3_data },
+	{ .compatible = "renesas,pcie-rcar-gen3", .data = &rcar_gen3_data },
 	{},
 };
 
@@ -1015,8 +1028,8 @@ static int rcar_pcie_probe(struct platform_device *pdev)
 	if (err)
 		goto err_clk_disable;
 
-	host->phy_init_fn = of_device_get_match_data(dev);
-	err = host->phy_init_fn(host);
+	host->variant = of_device_get_match_data(dev);
+	err = host->variant->phy_init_fn(host);
 	if (err) {
 		dev_err(dev, "failed to init PCIe PHY\n");
 		goto err_clk_disable;
@@ -1084,7 +1097,7 @@ static int __maybe_unused rcar_pcie_resume(struct device *dev)
 		return 0;
 
 	/* Failure to get a link might just be that no cards are inserted */
-	err = host->phy_init_fn(host);
+	err = host->variant->phy_init_fn(host);
 	if (err) {
 		dev_info(dev, "PCIe link down\n");
 		return 0;
-- 
2.25.1