RTEMS | dev/serial: Refactor the pl011 driver to be extensible (!47)

[Ning Yang (@yangn0)]

Ning Yang commented on a discussion on bsps/shared/dev/serial/arm-pl011.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/47#note_111525

 > +
 > +  /* Control: Re-enable UART */
 > +  cr |= PL011_UARTCR_UARTEN | PL011_UARTCR_TXE;
 > +
 > +  return cr;
 > +}
 > +
 > +static bool arm_pl011_set_attributes(
 > +  rtems_termios_device_context *base,
 > +  const struct termios *term
 > +)
 > +{
 > +  uint32_t ibrd, fbrd, lcrh, baud, cr;
 > +  int err;
 > +  arm_pl011_context *context = (arm_pl011_context *) base;
 > +  arm_pl011_uart *regs = arm_pl011_get_regs(base);

If I add `volatile` in this line, the parameters of functions `arm_pl011_enable_irq` and `arm_pl011_clear_irq` must also be added volatile(Otherwise the compiler will issue a warning), which is unnecessary.

Add `volatile` to them all?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/47#note_111525
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