diff options
Diffstat (limited to 'doc/develop/driver-model/serial-howto.rst')
| -rw-r--r-- | doc/develop/driver-model/serial-howto.rst | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/doc/develop/driver-model/serial-howto.rst b/doc/develop/driver-model/serial-howto.rst index 5b1d57d83a..17b53e3cab 100644 --- a/doc/develop/driver-model/serial-howto.rst +++ b/doc/develop/driver-model/serial-howto.rst @@ -62,7 +62,7 @@ what you need. U-Boot automatically includes these files: see :ref:`dttweaks`. Here are some things you might need to consider: 1. The serial driver itself needs to be present before relocation, so that the - U-Boot banner appears. Make sure it has a u-boot,dm-pre-reloc tag in the device + U-Boot banner appears. Make sure it has a bootph-all tag in the device tree, so that the serial driver is bound when U-Boot starts. For example, on iMX8:: @@ -75,11 +75,11 @@ Here are some things you might need to consider: put this in your xxx-u-boot.dtsi file:: &lpuart3 { - u-boot,dm-pre-proper; + bootph-some-ram; }; 2. If your serial port requires a particular pinmux configuration, you may need - a pinctrl driver. This needs to have a u-boot,dm-pre-reloc tag also. Take care + a pinctrl driver. This needs to have a bootph-all tag also. Take care that any subnodes have the same tag, if they are needed to make the correct pinctrl available. @@ -107,15 +107,15 @@ Here are some things you might need to consider: parents, so put this in your xxx-u-boot.dtsi file:: &pinctrl { - u-boot,dm-pre-reloc; + bootph-all; }; &uart2 { - u-boot,dm-pre-reloc; + bootph-all; }; &uart2_xfer { - u-boot,dm-pre-reloc; + bootph-all; }; 3. The same applies to power domains. For example, if a particular power domain @@ -125,11 +125,11 @@ Here are some things you might need to consider: For example, on iMX8, put this in your xxx-u-boot.dtsi file:: &pd_dma { - u-boot,dm-pre-proper; + bootph-some-ram; }; &pd_dma_lpuart3 { - u-boot,dm-pre-proper; + bootph-some-ram; }; 4. The same applies to clocks, in the same way. Make sure that when your driver @@ -168,10 +168,10 @@ some customisation. Serial in SPL ------------- -A similar process is needed in SPL, but in this case the u-boot,dm-spl or -u-boot,dm-tpl tags are used. Add these in the same way as above, to ensure that -the SPL device tree contains the required nodes (see spl/u-boot-spl.dtb for -what it actually contains). +A similar process is needed in SPL, but in this case the bootph-pre-ram or +bootph-pre-sram tags are used. Add these in the same way as above, to ensure +that the SPL device tree contains the required nodes (see spl/u-boot-spl.dtb +for what it actually contains). Removing old code ----------------- |