dm: misc: bind STM32F4/F7 clock from rcc MFD driver

Like STM32H7, now STM32F4/F7 clock drivers are binded by
MFD stm32_rcc driver.
This also allows to add reset support to STM32F4/F7 SoCs family.
As Reset driver is not part of SPL supported drivers, don't bind it
in case of SPL to avoid that stm32_rcc_bind() returns an error.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>

drivers/clk/clk_stm32f.c

@@ -8,6 +8,7 @@
 #include <common.h>
 #include <clk-uclass.h>
 #include <dm.h>
+#include <stm32_rcc.h>
 
 #include <asm/io.h>
 #include <asm/arch/stm32.h>
@@ -71,38 +72,6 @@
  */
 #define RCC_APB2ENR_SYSCFGEN		BIT(14)
 
-
-struct pll_psc {
-	u8	pll_m;
-	u16	pll_n;
-	u8	pll_p;
-	u8	pll_q;
-	u8	ahb_psc;
-	u8	apb1_psc;
-	u8	apb2_psc;
-};
-
-#define AHB_PSC_1			0
-#define AHB_PSC_2			0x8
-#define AHB_PSC_4			0x9
-#define AHB_PSC_8			0xA
-#define AHB_PSC_16			0xB
-#define AHB_PSC_64			0xC
-#define AHB_PSC_128			0xD
-#define AHB_PSC_256			0xE
-#define AHB_PSC_512			0xF
-
-#define APB_PSC_1			0
-#define APB_PSC_2			0x4
-#define APB_PSC_4			0x5
-#define APB_PSC_8			0x6
-#define APB_PSC_16			0x7
-
-struct stm32_clk_info {
-	struct pll_psc sys_pll_psc;
-	bool has_overdrive;
-};
-
 struct stm32_clk_info stm32f4_clk_info = {
 	/* 180 MHz */
 	.sys_pll_psc = {
@@ -311,7 +280,17 @@ static int stm32_clk_probe(struct udevice *dev)
 		return -EINVAL;
 
 	priv->base = (struct stm32_rcc_regs *)addr;
-	priv->info = (struct stm32_clk_info *)dev_get_driver_data(dev);
+
+	switch (dev_get_driver_data(dev)) {
+	case STM32F4:
+		priv->info = &stm32f4_clk_info;
+		break;
+	case STM32F7:
+		priv->info = &stm32f7_clk_info;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	if (priv->info->has_overdrive) {
 		err = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
@@ -353,16 +332,9 @@ static struct clk_ops stm32_clk_ops = {
 	.get_rate	= stm32_clk_get_rate,
 };
 
-static const struct udevice_id stm32_clk_ids[] = {
-	{ .compatible = "st,stm32f42xx-rcc", .data = (ulong)&stm32f4_clk_info},
-	{ .compatible = "st,stm32f746-rcc", .data = (ulong)&stm32f7_clk_info},
-	{}
-};
-
 U_BOOT_DRIVER(stm32fx_clk) = {
-	.name			= "stm32fx_clk",
+	.name			= "stm32fx_rcc_clock",
 	.id			= UCLASS_CLK,
-	.of_match		= stm32_clk_ids,
 	.ops			= &stm32_clk_ops,
 	.probe			= stm32_clk_probe,
 	.priv_auto_alloc_size	= sizeof(struct stm32_clk),

drivers/misc/stm32_rcc.c

@@ -8,31 +8,63 @@
 #include <common.h>
 #include <dm.h>
 #include <misc.h>
+#include <stm32_rcc.h>
+#include <dm/device-internal.h>
 #include <dm/lists.h>
 
+struct stm32_rcc_clk stm32_rcc_clk_f4 = {
+	.drv_name = "stm32fx_rcc_clock",
+	.soc = STM32F4,
+};
+
+struct stm32_rcc_clk stm32_rcc_clk_f7 = {
+	.drv_name = "stm32fx_rcc_clock",
+	.soc = STM32F7,
+};
+
+struct stm32_rcc_clk stm32_rcc_clk_h7 = {
+	.drv_name = "stm32h7_rcc_clock",
+};
+
 static int stm32_rcc_bind(struct udevice *dev)
 {
-	int ret;
 	struct udevice *child;
+	struct driver *drv;
+	struct stm32_rcc_clk *rcc_clk =
+		(struct stm32_rcc_clk *)dev_get_driver_data(dev);
+	int ret;
 
 	debug("%s(dev=%p)\n", __func__, dev);
 
-	ret = device_bind_driver_to_node(dev, "stm32h7_rcc_clock",
-					 "stm32h7_rcc_clock",
-					 dev_ofnode(dev), &child);
+	drv = lists_driver_lookup_name(rcc_clk->drv_name);
+	if (!drv) {
+		debug("Cannot find driver '%s'\n", rcc_clk->drv_name);
+		return -ENOENT;
+	}
+
+	ret = device_bind_with_driver_data(dev, drv, rcc_clk->drv_name,
+					   rcc_clk->soc,
+					   dev_ofnode(dev), &child);
+
 	if (ret)
 		return ret;
 
+#ifdef CONFIG_SPL_BUILD
+	return 0;
+#else
 	return device_bind_driver_to_node(dev, "stm32_rcc_reset",
 					  "stm32_rcc_reset",
 					  dev_ofnode(dev), &child);
+#endif
 }
 
 static const struct misc_ops stm32_rcc_ops = {
 };
 
 static const struct udevice_id stm32_rcc_ids[] = {
-	{.compatible = "st,stm32h743-rcc"},
+	{.compatible = "st,stm32f42xx-rcc", .data = (ulong)&stm32_rcc_clk_f4 },
+	{.compatible = "st,stm32f746-rcc", .data = (ulong)&stm32_rcc_clk_f7 },
+	{.compatible = "st,stm32h743-rcc", .data = (ulong)&stm32_rcc_clk_h7 },
 	{ }
 };
 

include/stm32_rcc.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ * Author(s): Patrice CHOTARD, <patrice.chotard@st.com> for STMicroelectronics.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __STM32_RCC_H_
+#define __STM32_RCC_H_
+
+#define AHB_PSC_1			0
+#define AHB_PSC_2			0x8
+#define AHB_PSC_4			0x9
+#define AHB_PSC_8			0xA
+#define AHB_PSC_16			0xB
+#define AHB_PSC_64			0xC
+#define AHB_PSC_128			0xD
+#define AHB_PSC_256			0xE
+#define AHB_PSC_512			0xF
+
+#define APB_PSC_1			0
+#define APB_PSC_2			0x4
+#define APB_PSC_4			0x5
+#define APB_PSC_8			0x6
+#define APB_PSC_16			0x7
+
+struct pll_psc {
+	u8	pll_m;
+	u16	pll_n;
+	u8	pll_p;
+	u8	pll_q;
+	u8	ahb_psc;
+	u8	apb1_psc;
+	u8	apb2_psc;
+};
+
+struct stm32_clk_info {
+	struct pll_psc sys_pll_psc;
+	bool has_overdrive;
+};
+
+enum soc_family {
+	STM32F4,
+	STM32F7,
+};
+
+struct stm32_rcc_clk {
+	char *drv_name;
+	enum soc_family soc;
+};
+
+#endif /* __STM32_RCC_H_ */