Simon,
I am totally being confused.
As far as I looked at the dm code,
the private data is calloc'ed in device_probe() function
if (drv->priv_auto_alloc_size) {
dev->priv = calloc(1, drv->priv_auto_alloc_size);
if (!dev->priv) {
ret = -ENOMEM;
goto fail;
}
}
So, dev->priv is storing the address of the allocated memory.
Am I understanding correctly?
If so, I can't understand the following code:
static int ns16550_serial_getc(struct udevice *dev)
{
struct NS16550 *const com_port = dev_get_priv(dev);
if (!serial_in(&com_port->lsr) & UART_LSR_DR)
return -EAGAIN;
"com_port" is dev->priv, so it is pointing to the allocated area on RAM,
I guess.
It looks like
serial_in(&com_port->lsr) is trying to read from the hardware register ?
Or reading from malloc area RAM ??
Best Regards
Masahiro Yamada
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