linux-kernel - Re: [PATCH 10/14] gpio: omap: Drop the concept of gpio banks not being able to lose context.

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Message-ID: <20180412142257.GW5700@atomide.com>
Date:   Thu, 12 Apr 2018 07:22:57 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Keerthy <j-keerthy@...com>
Cc:     linus.walleij@...aro.org, grygorii.strashko@...com,
        t-kristo@...com, Russ.Dill@...com, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, ssantosh@...nel.org,
        haojian.zhuang@...aro.org, linux-arm-kernel@...ts.infradead.org,
        d-gerlach@...com
Subject: Re: [PATCH 10/14] gpio: omap: Drop the concept of gpio banks not
 being able to lose context.

* Keerthy <j-keerthy@...com> [180412 03:56]:
> From: Russ Dill <Russ.Dill@...com>
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -68,7 +68,7 @@ struct gpio_bank {
>  	bool dbck_enabled;
>  	bool is_mpuio;
>  	bool dbck_flag;
> -	bool loses_context;
> +
>  	bool context_valid;
>  	int stride;
>  	u32 width;

For some SoCs GPIO bank1 won't lose the context ever. So I'd like to
keep loses_context flag around to avoid pointless save and restore.
But maybe this still happens with get_context_loss_count and I'm
misreading this patch?

However..

> @@ -1198,15 +1198,9 @@ static int omap_gpio_probe(struct platform_device *pdev)
>  #ifdef CONFIG_OF_GPIO
>  	bank->chip.of_node = of_node_get(node);
>  #endif
> -	if (node) {
> -		if (!of_property_read_bool(node, "ti,gpio-always-on"))
> -			bank->loses_context = true;
> -	} else {
> -		bank->loses_context = pdata->loses_context;
> -
> -		if (bank->loses_context)
> -			bank->get_context_loss_count =
> -				pdata->get_context_loss_count;
> +	if (!node) {
> +		bank->get_context_loss_count =
> +			pdata->get_context_loss_count;
>  	}
>  
>  	if (bank->regs->set_dataout && bank->regs->clr_dataout)

.. I do have a patch ready here that I'll post after -rc1 to remove
CONFIG_OMAP_PM_NOOP related stuff, turns out that's noop anyways :)

So yeah the pdata->get_context_loss_count parts are noop and can
be just removed.

Regards,

Tony