> > +/* Store GPIO context across system-wide suspend/resume transitions
> > +*/ static struct gpio_saved_regs {
> > + unsigned long data;
> > + unsigned long dir;
> > + unsigned long int_en;
> > + unsigned long int_mask;
> > + unsigned long int_type;
> > + unsigned long int_pol;
> > + unsigned long int_deb;
> > +} saved_regs;
> > +
> > +static int dwapb_gpio_suspend(struct device *dev) {
> > + struct platform_device *pdev = to_platform_device(dev);
> > + struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
> > + struct bgpio_chip *bgc = &gpio->ports[0].bgc;
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(&bgc->lock, flags);
> > +
> > + saved_regs.int_mask = dwapb_read(gpio, GPIO_INTMASK);
> > + saved_regs.int_en = dwapb_read(gpio, GPIO_INTEN);
> > + saved_regs.int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
> > + saved_regs.int_pol = dwapb_read(gpio, GPIO_INT_POLARITY);
> > + saved_regs.int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
> > + saved_regs.dir = dwapb_read(gpio, GPIO_SWPORTA_DDR);
> > + saved_regs.data = dwapb_read(gpio, GPIO_SWPORTA_DR);
>
> Hello,
>
> The DesignWare GPIO IP can be configured to have ports a, b, c, and d. So you
> will need to save and restore any ports that are present. I think that *some*
> configurations of the IP include a register that can tell us how it was configured,
> but that register is also optional :) I don't have confidence that we can
> read/write the registers blindly whether they are known to be there or not.
> So you may be stuck with looking at the device tree or platform data to know
> whether banks b, c, or d exist.
>
>From the code, the device node has one property for port index. If the index is '0', then it is port A.
So I think we can store the status according to the port index.
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