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@@ -69,9 +69,8 @@ strictly necessary. Notable problems include:
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- Correct relations between nodes are not implemented. This means that
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parent/child relations (like bus device iteration) do not work yet.
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Some phandles (those that are recognised as such) are converted into
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- a pointer to platform data. This pointer can potentially be used to
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- access the referenced device (by searching for the pointer value).
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- This feature is not yet implemented, however.
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+ a pointer to struct driver_info. This pointer can be used to access
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+ the referenced device.
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How it works
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@@ -146,10 +145,10 @@ and the following device declaration:
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.clock_freq_min_max = {0x61a80, 0x8f0d180},
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.vmmc_supply = 0xb,
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.num_slots = 0x1,
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- .clocks = {{&dtv_clock_controller_at_ff760000, 456},
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- {&dtv_clock_controller_at_ff760000, 68},
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- {&dtv_clock_controller_at_ff760000, 114},
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- {&dtv_clock_controller_at_ff760000, 118}},
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+ .clocks = {{NULL, 456},
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+ {NULL, 68},
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+ {NULL, 114},
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+ {NULL, 118}},
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.cap_mmc_highspeed = true,
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.disable_wp = true,
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.bus_width = 0x4,
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@@ -164,6 +163,13 @@ and the following device declaration:
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.platdata_size = sizeof(dtv_dwmmc_at_ff0c0000),
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};
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+ void dm_populate_phandle_data(void) {
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+ dtv_dwmmc_at_ff0c0000.clocks[0].node = DM_GET_DEVICE(clock_controller_at_ff760000);
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+ dtv_dwmmc_at_ff0c0000.clocks[1].node = DM_GET_DEVICE(clock_controller_at_ff760000);
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+ dtv_dwmmc_at_ff0c0000.clocks[2].node = DM_GET_DEVICE(clock_controller_at_ff760000);
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+ dtv_dwmmc_at_ff0c0000.clocks[3].node = DM_GET_DEVICE(clock_controller_at_ff760000);
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+ }
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+
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The device is then instantiated at run-time and the platform data can be
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accessed using:
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@@ -329,7 +335,9 @@ prevents them being used inadvertently. All usage must be bracketed with
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#if CONFIG_IS_ENABLED(OF_PLATDATA).
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The dt-platdata.c file contains the device declarations and is is built in
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-spl/dt-platdata.c.
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+spl/dt-platdata.c. It additionally contains the definition of
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+dm_populate_phandle_data() which is responsible of filling the phandle
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+information by adding references to U_BOOT_DEVICE by using DM_GET_DEVICE
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The beginnings of a libfdt Python module are provided. So far this only
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implements a subset of the features.
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