31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
# overlays fixup script
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# implements (or rather substitutes) overlay arguments functionality
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# using u-boot scripting, environment variables and "fdt" command
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setenv decompose_pin 'setexpr tmp_pinctrl sub "GPIO(0|1|2|3|4)_\\S\\d+" "\\1";
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setexpr tmp_bank sub "GPIO\\d_(\\S)\\d+" "\\1";
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test "${tmp_bank}" = "A" && setenv tmp_bank 0;
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test "${tmp_bank}" = "B" && setenv tmp_bank 1;
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test "${tmp_bank}" = "C" && setenv tmp_bank 2;
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test "${tmp_bank}" = "D" && setenv tmp_bank 3;
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setexpr tmp_pin sub "GPIO\\d_\\S(\\d+)" "\\1";
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setexpr tmp_bank ${tmp_bank} * 8;
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setexpr tmp_pin ${tmp_bank} + ${tmp_pin}'
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if test -n "${param_w1_pin}"; then
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setenv tmp_pinctrl "${param_w1_pin}"
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setenv tmp_bank "${param_w1_pin}"
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setenv tmp_pin "${param_w1_pin}"
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run decompose_pin
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echo "${param_w1_pin} ---> pinctrl = ${tmp_pinctrl}"
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echo "${param_w1_pin} ---> bank = ${tmp_bank}"
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echo "${param_w1_pin} ---> pin = ${tmp_pin}"
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fdt get value tmp_pinctrl /__symbols__ gpio${tmp_pinctrl}
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echo "${param_w1_pin} ---> tmp_pinctrl = ${tmp_pinctrl}"
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fdt get value tmp_phandle ${tmp_pinctrl} phandle
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echo "${param_w1_pin} ---> tmp_phandle = ${tmp_phandle}"
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fdt set /onewire@0 gpios "<${tmp_phandle} ${tmp_pin} 0 0>"
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env delete tmp_pinctrl tmp_bank tmp_pin tmp_phandle
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fi
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