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i2c: omap24xx: Surround DM_FLAG_PRE_RELOC flag with OF_CONTROL check

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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>
This commit is contained in:
Bin Meng 2018-10-24 06:36:31 -07:00 committed by Simon Glass
parent 695c4994ac
commit e0cfc20984
1 changed files with 2 additions and 0 deletions
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2
drivers/i2c/omap24xx_i2c.c
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@ -925,7 +925,9 @@ U_BOOT_DRIVER(i2c_omap) = {
.probe = omap_i2c_probe, .probe = omap_i2c_probe,
.priv_auto_alloc_size = sizeof(struct omap_i2c), .priv_auto_alloc_size = sizeof(struct omap_i2c),
.ops = &omap_i2c_ops, .ops = &omap_i2c_ops,
#if !CONFIG_IS_ENABLED(OF_CONTROL)
.flags = DM_FLAG_PRE_RELOC, .flags = DM_FLAG_PRE_RELOC,
#endif
}; };
#endif /* CONFIG_DM_I2C */ #endif /* CONFIG_DM_I2C */