p2sb: Add a method to hide the bus

The P2SB bus needs to be hidden in some cases so that it does not get
auto-configured by Linux. Add a method for this.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Reviewed-by: NWolfgang Wallner <wolfgang.wallner@br-automation.com>
Tested-by: NWolfgang Wallner <wolfgang.wallner@br-automation.com>

drivers/misc/p2sb-uclass.c

@@ -18,6 +18,16 @@
 
 #define PCR_COMMON_IOSF_1_0	1
 
+int p2sb_set_hide(struct udevice *dev, bool hide)
+{
+	struct p2sb_ops *ops = p2sb_get_ops(dev);
+
+	if (!ops->set_hide)
+		return -ENOSYS;
+
+	return ops->set_hide(dev, hide);
+}
+
 void *pcr_reg_address(struct udevice *dev, uint offset)
 {
 	struct p2sb_child_platdata *pplat = dev_get_parent_platdata(dev);

include/p2sb.h

@@ -31,13 +31,36 @@ struct p2sb_uc_priv {
 };
 
 /**
- * struct p2sb_ops - Operations for the P2SB (none at present)
+ * struct p2sb_ops - Operations for the P2SB
  */
 struct p2sb_ops {
+	/**
+	 * set_hide() - Set/clear the 'hide' bit on the p2sb
+	 *
+	 * This device can be hidden from the PCI bus if needed. This method
+	 * can be called before the p2sb is probed.
+	 *
+	 * @dev: P2SB device
+	 * @hide: true to hide the device, false to show it
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*set_hide)(struct udevice *dev, bool hide);
 };
 
 #define p2sb_get_ops(dev)        ((struct p2sb_ops *)(dev)->driver->ops)
 
+/**
+ * p2sb_set_hide() - Set/clear the 'hide' bit on the p2sb
+ *
+ * This device can be hidden from the PCI bus if needed. This method
+ * can be called before the p2sb is probed.
+ *
+ * @dev: P2SB device
+ * @hide: true to hide the device, false to show it
+ * @return 0 if OK, -ve on error
+ */
+int p2sb_set_hide(struct udevice *dev, bool hide);
+
 /**
  * pcr_read32/16/8() - Read from a PCR device
  *