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SubjectRe: [PATCH 2/2 v4] tty/serial/8250: use mctrl_gpio helpers
On Mon, Jun 03, 2019 at 10:33:32AM +0200, Stefan Roese wrote:
> From: Yegor Yefremov <yegorslists@googlemail.com>
>
> This patch permits the usage for GPIOs to control
> the CTS/RTS/DTR/DSR/DCD/RI signals.

> + if (up->gpios) {

> + mctrl_gpio_set(up->gpios, mctrl_gpio);
> + }

...

> + if (up->gpios) {

> + mctrl_gpio = mctrl_gpio_get_outputs(up->gpios, &mctrl_gpio);

> + }

...

> + gpios = mctrl_gpio_init(&uart->port, 0);
> + if (IS_ERR(gpios)) {
> + if (PTR_ERR(gpios) != -ENOSYS)
> + return PTR_ERR(gpios);
> + }

...

> + if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(up->gpios,
> + UART_GPIO_RTS))) {

> + }

...

> - if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
> + if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW
> + && IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(up->gpios,
> + UART_GPIO_RTS))) {

> }

...

> + if (up->gpios)
> + mctrl_gpio_disable_ms(up->gpios);

...

> + if (up->gpios)
> + mctrl_gpio_enable_ms(up->gpios);

...

> + if (up->gpios)
> + return mctrl_gpio_get(up->gpios, &ret);


Can we rather make this mimic the gpiod_get_optional() API?

So, if we get an error, it's an error, otherwise with NULL pointer the
operations goes to be no-op.

[IS_ERR_OR_NULL() -> IS_ERR(), if (up->gpios) -> /dev/null, etc]


--
With Best Regards,
Andy Shevchenko


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