PM / devfreq: rockchip-dfi: Add SoC specific init function

Move the RK3399 specifics to a SoC specific init function to make
the way free for supporting other SoCs later.

Link: https://lore.kernel.org/lkml/20230704093242.583575-5-s.hauer@pengutronix.de/
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

Author: saschahauer

drivers/devfreq/event/rockchip-dfi.c

@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <soc/rockchip/rk3399_grf.h>
 
@@ -55,27 +56,21 @@ struct rockchip_dfi {
 	void __iomem *regs;
 	struct regmap *regmap_pmu;
 	struct clk *clk;
+	u32 ddr_type;
 };
 
 static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
 {
 	struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev);
 	void __iomem *dfi_regs = dfi->regs;
-	u32 val;
-	u32 ddr_type;
-
-	/* get ddr type */
-	regmap_read(dfi->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
-	ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
-		    RK3399_PMUGRF_DDRTYPE_MASK;
 
 	/* clear DDRMON_CTRL setting */
 	writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL);
 
 	/* set ddr type to dfi */
-	if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR3)
+	if (dfi->ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR3)
 		writel_relaxed(LPDDR3_EN, dfi_regs + DDRMON_CTRL);
-	else if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR4)
+	else if (dfi->ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR4)
 		writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL);
 
 	/* enable count, use software mode */
@@ -167,8 +162,26 @@ static const struct devfreq_event_ops rockchip_dfi_ops = {
 	.set_event = rockchip_dfi_set_event,
 };
 
+static int rk3399_dfi_init(struct rockchip_dfi *dfi)
+{
+	struct regmap *regmap_pmu = dfi->regmap_pmu;
+	u32 val;
+
+	dfi->clk = devm_clk_get(dfi->dev, "pclk_ddr_mon");
+	if (IS_ERR(dfi->clk))
+		return dev_err_probe(dfi->dev, PTR_ERR(dfi->clk),
+				     "Cannot get the clk pclk_ddr_mon\n");
+
+	/* get ddr type */
+	regmap_read(regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
+	dfi->ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
+			RK3399_PMUGRF_DDRTYPE_MASK;
+
+	return 0;
+};
+
 static const struct of_device_id rockchip_dfi_id_match[] = {
-	{ .compatible = "rockchip,rk3399-dfi" },
+	{ .compatible = "rockchip,rk3399-dfi", .data = rk3399_dfi_init },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match);
@@ -179,6 +192,12 @@ static int rockchip_dfi_probe(struct platform_device *pdev)
 	struct rockchip_dfi *dfi;
 	struct devfreq_event_desc *desc;
 	struct device_node *np = pdev->dev.of_node, *node;
+	int (*soc_init)(struct rockchip_dfi *dfi);
+	int ret;
+
+	soc_init = of_device_get_match_data(&pdev->dev);
+	if (!soc_init)
+		return -EINVAL;
 
 	dfi = devm_kzalloc(dev, sizeof(*dfi), GFP_KERNEL);
 	if (!dfi)
@@ -188,11 +207,6 @@ static int rockchip_dfi_probe(struct platform_device *pdev)
 	if (IS_ERR(dfi->regs))
 		return PTR_ERR(dfi->regs);
 
-	dfi->clk = devm_clk_get(dev, "pclk_ddr_mon");
-	if (IS_ERR(dfi->clk))
-		return dev_err_probe(dev, PTR_ERR(dfi->clk),
-				     "Cannot get the clk pclk_ddr_mon\n");
-
 	node = of_parse_phandle(np, "rockchip,pmu", 0);
 	if (!node)
 		return dev_err_probe(&pdev->dev, -ENODEV, "Can't find pmu_grf registers\n");
@@ -209,6 +223,10 @@ static int rockchip_dfi_probe(struct platform_device *pdev)
 	desc->driver_data = dfi;
 	desc->name = np->name;
 
+	ret = soc_init(dfi);
+	if (ret)
+		return ret;
+
 	dfi->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);
 	if (IS_ERR(dfi->edev)) {
 		dev_err(&pdev->dev,