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scripts/dts: Generate IRQ values for multi-level IRQs

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When we have multi-level (ie chained interrupt controllers) Zephyr has a
schemee to encode the multi-level and IRQ values along the level's into
a single 32-bit value.  This is the "IRQ" value expected by Zephyr APIs.

The encoding scheme is documented here:

doc/reference/kernel/other/interrupts.rst

Update the device tree generation to walk the interrupt levels and
generate the expected encoded value for the IRQ.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Kumar Gala 2019-08-07 12:02:24 -05:00 • committed by Kumar Gala
commit c16537fbde
1 changed files with 18 additions and 2 deletions
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20
scripts/dts/gen_defines.py
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@ -446,11 +446,27 @@ def write_irqs(dev):
alias += "_" + str2ident(cell_name)
return alias
def encode_zephyr_multi_level_irq(irq, irq_num):
# See doc/reference/kernel/other/interrupts.rst for details
# on how this encoding works
irq_ctrl = irq.controller
# Look for interrupt controller parent until we have none
while irq_ctrl.interrupts:
irq_num = (irq_num + 1) << 8
if "irq" not in irq_ctrl.interrupts[0].specifier:
err("Expected binding for {!r} to have 'irq' "
"in '#cells'".format(irq_ctrl))
irq_num |= irq_ctrl.interrupts[0].specifier["irq"]
irq_ctrl = irq_ctrl.interrupts[0].controller
return irq_num
for irq_i, irq in enumerate(dev.interrupts):
# We ignore the controller for now
for cell_name, cell_value in irq.specifier.items():
ident = "IRQ_{}".format(irq_i)
if cell_name != "irq":
if cell_name == "irq":
cell_value = encode_zephyr_multi_level_irq(irq, cell_value)
else:
ident += "_" + str2ident(cell_name)
out_dev(dev, ident, cell_value,