[PATCH 4/8] soc: imx: gpc: fix imx6sl gpc power domain regression

[Dong Aisheng]

On Mon, Mar 20, 2017 at 10:26:14AM +0100, Lucas Stach wrote:
> Am Montag, den 20.03.2017, 14:15 +0800 schrieb Dong Aisheng:
> > Commit 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
> > broke the MX6SL GPC power domain support.
> > It always got the following error:
> > [    1.248364] imx-gpc 20dc000.gpc: could not find pgc DT node
> > This patch adds back the legecy support.
> 
> This patch removes a safeguard against abusing the old binding for new
> SoCs. Please leave this check in place and instead loosen the check to
> also allow the old i.MX6SL binding.
> 

Thanks for the reminder.
I found beside the checking, we probably also need some extra fix that
the current imx_gpc_old_dt_init() only supports two domains while the
driver formerly supports three for MX6SL.

And because the num_domains is defined by driver itself, no need check
in imx_gpc_old_dt_init() anymore.

The patch would be as follows:
diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 4885ec2..6a806a1 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -303,10 +303,13 @@ static struct genpd_onecell_data imx_gpc_onecell_data = {
 
 static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap)
 {
+       const struct of_device_id *of_id =
+                       of_match_device(imx_gpc_dt_ids, dev);
+       const struct imx_gpc_dt_data *of_id_data = of_id->data;
        struct imx_pm_domain *domain;
        int i, ret;
 
-       for (i = 0; i < 2; i++) {
+       for (i = 0; i < of_id_data->num_domains; i++) {
                domain = &imx_gpc_domains[i];
                domain->regmap = regmap;
                domain->ipg_rate_mhz = 66;
@@ -324,7 +327,7 @@ static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap)
                }
        }
 
-       for (i = 0; i < 2; i++)
+       for (i = 0; i < of_id_data->num_domains; i++)
                pm_genpd_init(&imx_gpc_domains[i].base, NULL, false);
 
        if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
@@ -337,7 +340,7 @@ static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap)
        return 0;
 
 genpd_err:
-       for (i = 0; i < 2; i++)
+       for (i = 0; i < of_id_data->num_domains; i++)
                pm_genpd_remove(&imx_gpc_domains[i].base);
        imx_pgc_put_clocks(&imx_gpc_domains[1]);
 clk_err:

Do you think it's ok?

Regards
Dong Aisheng

> > 
> > Cc: Lucas Stach <l.stach at pengutronix.de>
> > Cc: Shawn Guo <shawnguo at kernel.org>
> > Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
> > Signed-off-by: Dong Aisheng <aisheng.dong at nxp.com>
> > ---
> >  drivers/soc/imx/gpc.c | 6 ------
> >  1 file changed, 6 deletions(-)
> > 
> > diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
> > index ba6e7ab..c1d0e67 100644
> > --- a/drivers/soc/imx/gpc.c
> > +++ b/drivers/soc/imx/gpc.c
> > @@ -385,12 +385,6 @@ static int imx_gpc_probe(struct platform_device *pdev)
> >  	}
> >  
> >  	if (!pgc_node) {
> > -		/* old DT layout is only supported for mx6q aka 2 domains */
> > -		if (of_id_data->num_domains != 2) {
> > -			dev_err(&pdev->dev, "could not find pgc DT node\n");
> > -			return -ENODEV;
> > -		}
> > -
> >  		ret = imx_gpc_old_dt_init(&pdev->dev, regmap);
> >  		if (ret)
> >  			return ret;
> 
>