Re: [U-Boot] pre_probe under struct driver

Hi Keerthy,

On Tue, 4 Jun 2019 at 14:01, Keerthy j-keerthy@ti.com wrote:

Hi Simon/Tom,

I am looking at the device_probe function in drivers/core/device.c

ret = uclass_pre_probe_device(dev); if (ret) goto fail;

     if (dev->parent && dev->parent->driver->child_pre_probe) {
             ret = dev->parent->driver->child_pre_probe(dev);
             if (ret)
                     goto fail;
     }

     if (drv->ofdata_to_platdata && dev_has_of_node(dev)) {
             ret = drv->ofdata_to_platdata(dev);
             if (ret)
                     goto fail;
     }

     /* Process 'assigned-{clocks/clock-parents/clock-rates}'

properties */ ret = clk_set_defaults(dev);

In case of a device like MPU we would like setup voltage before setting the clocks and i was looking if we can have a pre_probe for a driver to do things before driver gets probed. Neither uclass_pre_probe_device nor dev->parent->driver->child_pre_probe benefit me in this case.

Does my situation warrant adding a new hook to struct driver? Or are there instances of such handling already in u-boot.

For now, is it enough to probe the power driver from the clock driver?

Regards, Simon