mfd: intel-lpss: Add support for passing device properties

If the boot firmware does not support ACPI we need a way to pass device
configuration information to the drivers. The unified device properties API
already supports passing platform data via properties so let's take
advantage of that and allow probe drivers to pass set of properties to the
host controller driver.

In order to do that we need to be able to modify the MFD cell corresponding
the host controller, so make the core driver to take copy of the cell
instead of using it directly. Then we can assign info->pset to the
resulting copy of a cell and let the MFD core to assign that to the
resulting device.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/mfd/intel-lpss.c

@@ -24,6 +24,7 @@
 #include <linux/mfd/core.h>
 #include <linux/pm_qos.h>
 #include <linux/pm_runtime.h>
+#include <linux/property.h>
 #include <linux/seq_file.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 
@@ -72,7 +73,7 @@ struct intel_lpss {
 	enum intel_lpss_dev_type type;
 	struct clk *clk;
 	struct clk_lookup *clock;
-	const struct mfd_cell *cell;
+	struct mfd_cell *cell;
 	struct device *dev;
 	void __iomem *priv;
 	int devid;
@@ -217,6 +218,7 @@ static void intel_lpss_ltr_hide(struct intel_lpss *lpss)
 
 static int intel_lpss_assign_devs(struct intel_lpss *lpss)
 {
+	const struct mfd_cell *cell;
 	unsigned int type;
 
 	type = lpss->caps & LPSS_PRIV_CAPS_TYPE_MASK;
@@ -224,18 +226,22 @@ static int intel_lpss_assign_devs(struct intel_lpss *lpss)
 
 	switch (type) {
 	case LPSS_DEV_I2C:
-		lpss->cell = &intel_lpss_i2c_cell;
+		cell = &intel_lpss_i2c_cell;
 		break;
 	case LPSS_DEV_UART:
-		lpss->cell = &intel_lpss_uart_cell;
+		cell = &intel_lpss_uart_cell;
 		break;
 	case LPSS_DEV_SPI:
-		lpss->cell = &intel_lpss_spi_cell;
+		cell = &intel_lpss_spi_cell;
 		break;
 	default:
 		return -ENODEV;
 	}
 
+	lpss->cell = devm_kmemdup(lpss->dev, cell, sizeof(*cell), GFP_KERNEL);
+	if (!lpss->cell)
+		return -ENOMEM;
+
 	lpss->type = type;
 
 	return 0;
@@ -401,6 +407,8 @@ int intel_lpss_probe(struct device *dev,
 	if (ret)
 		return ret;
 
+	lpss->cell->pset = info->pset;
+
 	intel_lpss_init_dev(lpss);
 
 	lpss->devid = ida_simple_get(&intel_lpss_devid_ida, 0, 0, GFP_KERNEL);

drivers/mfd/intel-lpss.h

@@ -16,12 +16,14 @@
 
 struct device;
 struct resource;
+struct property_set;
 
 struct intel_lpss_platform_info {
 	struct resource *mem;
 	int irq;
 	unsigned long clk_rate;
 	const char *clk_con_id;
+	struct property_set *pset;
 };
 
 int intel_lpss_probe(struct device *dev,