dm: misc: add stm32 rcc driver

This patch adds the support of reset and clock control
block (rcc) found on STM32 SoCs.
This driver is similar to a MFD linux driver.

This driver supports currently STM32H7 only.
STM32F4 and STM32F7 will be migrated to this rcc MFD driver
in the future to uniformize all STM32 SoCs already upstreamed.

Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/misc/stm32_rcc.c b/drivers/misc/stm32_rcc.c
new file mode 100644
index 0000000000..a6c2a757ec
--- /dev/null
+++ b/drivers/misc/stm32_rcc.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ * Author(s): Patrice CHOTARD, <patrice.chotard@st.com> for STMicroelectronics.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <misc.h>
+#include <dm/lists.h>
+
+static int stm32_rcc_bind(struct udevice *dev)
+{
+	int ret;
+	struct udevice *child;
+
+	debug("%s(dev=%p)\n", __func__, dev);
+
+	ret = device_bind_driver_to_node(dev, "stm32h7_rcc_clock",
+					 "stm32h7_rcc_clock",
+					 dev_ofnode(dev), &child);
+	if (ret)
+		return ret;
+
+	return device_bind_driver_to_node(dev, "stm32_rcc_reset",
+					  "stm32_rcc_reset",
+					  dev_ofnode(dev), &child);
+}
+
+static const struct misc_ops stm32_rcc_ops = {
+};
+
+static const struct udevice_id stm32_rcc_ids[] = {
+	{.compatible = "st,stm32h743-rcc"},
+	{ }
+};
+
+U_BOOT_DRIVER(stm32_rcc) = {
+	.name		= "stm32-rcc",
+	.id		= UCLASS_MISC,
+	.of_match	= stm32_rcc_ids,
+	.bind		= stm32_rcc_bind,
+	.ops		= &stm32_rcc_ops,
+};