[serial] Calling platform specific code on driver bind/unbind

[Piotr Madalinski]

Hi,
I'm hacking my openwrt router and look for a proper way to make a serial 
driver call a platform-specific function such as this:

static void ath79_enable_uart(void) {
    if (soc_is_ar933x())
        ath79_gpio_function_enable(AR933X_GPIO_FUNC_UART_EN);
}

and

static void ath79_disable_uart(void) {
    if (soc_is_ar933x())
        ath79_gpio_function_disable(AR933X_GPIO_FUNC_UART_EN);
}

on driver bind/unbind instead of in platform initialization code, in 
order to be able to
reuse the pins as gpio, without disabling uart entirely.

My current solution uses platform_data to pass function pointers,
and invokes them in driver's request_port and release_port functions 
respectively.

And, oddly enough, the one in release_port gets invoked on unbind but 
the other one
isn't called on bind (I had to add a call to it in probe to get it working).

So I wonder, if the request/release functions are a proper place for 
such a callback,
or is there some better, more 'canonical' solution.

Also, I could attach my patches but it is my first post here, and they 
are a bit openwrt specific,
and I don't want to be yelled upon ;-).

Regards,
Piotr Madalinski
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