mfd: bcm2835-pm: Introduce SoC-specific type identifier

Power management blocks across the BCM2835 family share a common
base but require variant-specific handling. For instance, the
BCM2712 lacks ASB register space, yet it manages the power domain
for the V3D graphics block.

Add a hardware type identifier to the driver's private data. This
allows the driver to distinguish between SoC models and implement
custom quirks or features as needed.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Co-developed-by: Stanimir Varbanov <svarbanov@suse.de>
Signed-off-by: Stanimir Varbanov <svarbanov@suse.de>
Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/c4bb218654e91f312a01b419d3d408e5131f7673.1772839224.git.andrea.porta@suse.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: pelwell

drivers/mfd/bcm2835-pm.c

@@ -81,6 +81,7 @@ static int bcm2835_pm_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, pm);
 
 	pm->dev = dev;
+	pm->soc = (uintptr_t)device_get_match_data(dev);
 
 	ret = bcm2835_pm_get_pdata(pdev, pm);
 	if (ret)
@@ -106,9 +107,9 @@ static int bcm2835_pm_probe(struct platform_device *pdev)
 
 static const struct of_device_id bcm2835_pm_of_match[] = {
 	{ .compatible = "brcm,bcm2835-pm-wdt", },
-	{ .compatible = "brcm,bcm2835-pm", },
-	{ .compatible = "brcm,bcm2711-pm", },
-	{ .compatible = "brcm,bcm2712-pm", },
+	{ .compatible = "brcm,bcm2835-pm", .data = (void *)BCM2835_PM_SOC_BCM2835 },
+	{ .compatible = "brcm,bcm2711-pm", .data = (void *)BCM2835_PM_SOC_BCM2711 },
+	{ .compatible = "brcm,bcm2712-pm", .data = (void *)BCM2835_PM_SOC_BCM2712 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);

include/linux/mfd/bcm2835-pm.h

@@ -5,11 +5,18 @@
 
 #include <linux/regmap.h>
 
+enum bcm2835_soc {
+	BCM2835_PM_SOC_BCM2835,
+	BCM2835_PM_SOC_BCM2711,
+	BCM2835_PM_SOC_BCM2712,
+};
+
 struct bcm2835_pm {
 	struct device *dev;
 	void __iomem *base;
 	void __iomem *asb;
 	void __iomem *rpivid_asb;
+	enum bcm2835_soc soc;
 };
 
 #endif /* BCM2835_MFD_PM_H */