clk: Remove DM_FLAG_PRE_RELOC flag in various drivers

When a driver declares DM_FLAG_PRE_RELOC flag, it wishes to be
bound before relocation. However due to a bug in the DM core,
the flag only takes effect when devices are statically declared
via U_BOOT_DEVICE(). This bug has been fixed recently by commit
"dm: core: Respect drivers with the DM_FLAG_PRE_RELOC flag in
lists_bind_fdt()", but with the fix, it has a side effect that
all existing drivers that declared DM_FLAG_PRE_RELOC flag will
be bound before relocation now. This may expose potential boot
failure on some boards due to insufficient memory during the
pre-relocation stage.

To mitigate this potential impact, the following changes are
implemented:

- Remove DM_FLAG_PRE_RELOC flag in the driver, if the driver
  only supports configuration from device tree (OF_CONTROL)
- Keep DM_FLAG_PRE_RELOC flag in the driver only if the device
  is statically declared via U_BOOT_DEVICE()
- Surround DM_FLAG_PRE_RELOC flag with OF_CONTROL check, for
  drivers that support both statically declared devices and
  configuration from device tree

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/clk/altera/clk-arria10.c

@@ -352,7 +352,6 @@ static const struct udevice_id socfpga_a10_clk_match[] = {
 U_BOOT_DRIVER(socfpga_a10_clk) = {
 	.name		= "clk-a10",
 	.id		= UCLASS_CLK,
-	.flags		= DM_FLAG_PRE_RELOC,
 	.of_match	= socfpga_a10_clk_match,
 	.ops		= &socfpga_a10_clk_ops,
 	.bind		= socfpga_a10_clk_bind,

drivers/clk/clk_pic32.c

@@ -418,7 +418,6 @@ U_BOOT_DRIVER(pic32_clk) = {
 	.name		= "pic32_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= pic32_clk_ids,
-	.flags		= DM_FLAG_PRE_RELOC,
 	.ops		= &pic32_pic32_clk_ops,
 	.probe		= pic32_clk_probe,
 	.priv_auto_alloc_size = sizeof(struct pic32_clk_priv),

drivers/clk/clk_zynq.c

@@ -480,7 +480,6 @@ U_BOOT_DRIVER(zynq_clk) = {
 	.name		= "zynq_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= zynq_clk_ids,
-	.flags		= DM_FLAG_PRE_RELOC,
 	.ops		= &zynq_clk_ops,
 	.priv_auto_alloc_size = sizeof(struct zynq_clk_priv),
 	.probe		= zynq_clk_probe,

drivers/clk/exynos/clk-exynos7420.c

@@ -201,7 +201,6 @@ U_BOOT_DRIVER(exynos7420_clk_topc) = {
 	.probe = exynos7420_clk_topc_probe,
 	.priv_auto_alloc_size = sizeof(struct exynos7420_clk_topc_priv),
 	.ops = &exynos7420_clk_topc_ops,
-	.flags = DM_FLAG_PRE_RELOC,
 };
 
 static const struct udevice_id exynos7420_clk_top0_compat[] = {
@@ -216,7 +215,6 @@ U_BOOT_DRIVER(exynos7420_clk_top0) = {
 	.probe = exynos7420_clk_top0_probe,
 	.priv_auto_alloc_size = sizeof(struct exynos7420_clk_top0_priv),
 	.ops = &exynos7420_clk_top0_ops,
-	.flags = DM_FLAG_PRE_RELOC,
 };
 
 static const struct udevice_id exynos7420_clk_peric1_compat[] = {
@@ -229,5 +227,4 @@ U_BOOT_DRIVER(exynos7420_clk_peric1) = {
 	.id = UCLASS_CLK,
 	.of_match = exynos7420_clk_peric1_compat,
 	.ops = &exynos7420_clk_peric1_ops,
-	.flags = DM_FLAG_PRE_RELOC,
 };

drivers/clk/owl/clk_s900.c

@@ -134,5 +134,4 @@ U_BOOT_DRIVER(clk_owl) = {
 	.ops		= &owl_clk_ops,
 	.priv_auto_alloc_size = sizeof(struct owl_clk_priv),
 	.probe		= owl_clk_probe,
-	.flags		= DM_FLAG_PRE_RELOC,
 };