[RFC] devices without FDT node

Simon Glass sjg at chromium.org
Thu Mar 4 20:26:49 CET 2021

Hi Heinrich,

On Thu, 4 Mar 2021 at 08:01, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> Hello Simon,
> in U-Boot we can define drivers via U_BOOT_DRVINFO and U_BOOT_DRIVER.
> My current use case is SBI system reset extension. A driver would not
> reasonably depend on the device-tree because if the RISC-V cpu is in
> S-mode we know that there must be an SBI implementation. If the
> extension is available, has to be determined in the probe() function of
> the driver.
> My current solution is to use U_BOOT_DRIVER and to call
> device_bind_driver(gd->dm_root,...) in board_init(). But that results in
> code duplication in the board files.
> What do think about adding the usual driver functions to struct driver_info:
>         int (*bind)(struct udevice *dev);
>         int (*probe)(struct udevice *dev);
>         int (*remove)(struct udevice *dev);
>         int (*unbind)(struct udevice *dev);
> Alternatively one could add a flag DM_FLAG_AUTO_PROBE to the struct
> driver flags field which would lead to probing irrespective of the
> device-tree.
> I would prefer the latter solution.

Surely this should be in the devicetree. Why would it not be?


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