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@@ -1,11 +1,13 @@
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+.. SPDX-License-Identifier: GPL-2.0+
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+
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How to port a serial driver to driver model
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===========================================
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Almost all of the serial drivers have been converted as at January 2016. These
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ones remain:
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- serial_bfin.c
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- serial_pxa.c
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+ * serial_bfin.c
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+ * serial_pxa.c
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The deadline for this work was the end of January 2016. If no one steps
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forward to convert these, at some point there may come a patch to remove them!
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@@ -17,14 +19,14 @@ model. Please feel free to update this file with your ideas and suggestions.
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- Define CONFIG_DM_SERIAL for your board, vendor or architecture
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- If the board does not already use driver model, you need CONFIG_DM also
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- Your board should then build, but will not boot since there will be no serial
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- driver
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+ driver
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- Add the U_BOOT_DRIVER piece at the end (e.g. copy serial_s5p.c for example)
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- Add a private struct for the driver data - avoid using static variables
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- Implement each of the driver methods, perhaps by calling your old methods
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- You may need to adjust the function parameters so that the old and new
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- implementations can share most of the existing code
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+ implementations can share most of the existing code
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- If you convert all existing users of the driver, remove the pre-driver-model
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- code
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+ code
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In terms of patches a conversion series typically has these patches:
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- clean up / prepare the driver for conversion
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