drivers: Add SPMI bus uclass
Qualcom processors use proprietary bus to talk with PMIC devices -
SPMI (System Power Management Interface).
On wiring level it is similar to I2C, but on protocol level, it's
multi-master and has simple autodetection capabilities.
This commit adds simple uclass that provides bus read/write interface.
Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spmi/spmi-uclass.c b/drivers/spmi/spmi-uclass.c
new file mode 100644
index 0000000..4ddd51b
--- /dev/null
+++ b/drivers/spmi/spmi-uclass.c
@@ -0,0 +1,48 @@
+/*
+ * SPMI bus uclass driver
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <dm/root.h>
+#include <spmi/spmi.h>
+#include <linux/ctype.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int spmi_reg_read(struct udevice *dev, int usid, int pid, int reg)
+{
+ const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
+
+ if (!ops || !ops->read)
+ return -ENOSYS;
+
+ return ops->read(dev, usid, pid, reg);
+}
+
+int spmi_reg_write(struct udevice *dev, int usid, int pid, int reg,
+ uint8_t value)
+{
+ const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
+
+ if (!ops || !ops->write)
+ return -ENOSYS;
+
+ return ops->write(dev, usid, pid, reg, value);
+}
+
+static int spmi_post_bind(struct udevice *dev)
+{
+ return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
+UCLASS_DRIVER(spmi) = {
+ .id = UCLASS_SPMI,
+ .name = "spmi",
+ .post_bind = spmi_post_bind,
+};