diff mbox series

[v1,01/11] PCI: tegra: switch to using devm_fwnode_gpiod_get

Message ID 20220903-gpiod_get_from_of_node-remove-v1-1-b29adfb27a6c@gmail.com (mailing list archive)
State New, archived
Headers show
Series Get rid of [devm_]gpiod_get_from_of_node() public APIs | expand

Commit Message

Dmitry Torokhov Sept. 5, 2022, 6:30 a.m. UTC
I would like to limit (or maybe even remove) use of
[devm_]gpiod_get_from_of_node in drivers so that gpiolib can be cleaned
a bit, so let's switch to the generic device property API. It may even
help with handling secondary fwnodes when gpiolib is taught to handle
gpios described by swnodes.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Comments

Pali Rohár Sept. 5, 2022, 7:19 a.m. UTC | #1
On Sunday 04 September 2022 23:30:53 Dmitry Torokhov wrote:
> I would like to limit (or maybe even remove) use of
> [devm_]gpiod_get_from_of_node in drivers so that gpiolib can be cleaned
> a bit, so let's switch to the generic device property API. It may even
> help with handling secondary fwnodes when gpiolib is taught to handle
> gpios described by swnodes.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> 
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 8e323e93be91..929f9363e94b 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -2202,10 +2202,11 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
>  		 * and in this case fall back to using AFI per port register
>  		 * to toggle PERST# SFIO line.
>  		 */
> -		rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
> -							     "reset-gpios", 0,
> -							     GPIOD_OUT_LOW,
> -							     label);
> +		rp->reset_gpio = devm_fwnode_gpiod_get(dev,
> +						       of_fwnode_handle(port),
> +						       "reset",
> +						       GPIOD_OUT_LOW,
> +						       label);

Why in pci-aardvark.c for PERST# reset-gpio you have used
devm_gpiod_get_optional() and here in pci-tegra.c you have used
devm_fwnode_gpiod_get()? I think that PERST# logic is same in both
drivers.

>  		if (IS_ERR(rp->reset_gpio)) {
>  			if (PTR_ERR(rp->reset_gpio) == -ENOENT) {
>  				rp->reset_gpio = NULL;
> 
> -- 
> b4 0.10.0-dev-fc921
Andy Shevchenko Sept. 5, 2022, 10:49 a.m. UTC | #2
On Mon, Sep 5, 2022 at 10:23 AM Pali Rohár <pali@kernel.org> wrote:
> On Sunday 04 September 2022 23:30:53 Dmitry Torokhov wrote:

...

> > -             rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
> > -                                                          "reset-gpios", 0,
> > -                                                          GPIOD_OUT_LOW,
> > -                                                          label);
> > +             rp->reset_gpio = devm_fwnode_gpiod_get(dev,
> > +                                                    of_fwnode_handle(port),
> > +                                                    "reset",
> > +                                                    GPIOD_OUT_LOW,
> > +                                                    label);
>
> Why in pci-aardvark.c for PERST# reset-gpio you have used
> devm_gpiod_get_optional() and here in pci-tegra.c you have used
> devm_fwnode_gpiod_get()? I think that PERST# logic is same in both
> drivers.

It's not the same dev and its node in this case. There is one reset
for _all_ ports, here is the reset on _per port_ basis.
Pali Rohár Sept. 5, 2022, 10:53 a.m. UTC | #3
On Monday 05 September 2022 13:49:21 Andy Shevchenko wrote:
> On Mon, Sep 5, 2022 at 10:23 AM Pali Rohár <pali@kernel.org> wrote:
> > On Sunday 04 September 2022 23:30:53 Dmitry Torokhov wrote:
> 
> ...
> 
> > > -             rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
> > > -                                                          "reset-gpios", 0,
> > > -                                                          GPIOD_OUT_LOW,
> > > -                                                          label);
> > > +             rp->reset_gpio = devm_fwnode_gpiod_get(dev,
> > > +                                                    of_fwnode_handle(port),
> > > +                                                    "reset",
> > > +                                                    GPIOD_OUT_LOW,
> > > +                                                    label);
> >
> > Why in pci-aardvark.c for PERST# reset-gpio you have used
> > devm_gpiod_get_optional() and here in pci-tegra.c you have used
> > devm_fwnode_gpiod_get()? I think that PERST# logic is same in both
> > drivers.
> 
> It's not the same dev and its node in this case. There is one reset
> for _all_ ports, here is the reset on _per port_ basis.

aardvark is single port controller. So it is basically same.
Andy Shevchenko Sept. 5, 2022, 10:54 a.m. UTC | #4
On Mon, Sep 5, 2022 at 1:49 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Mon, Sep 5, 2022 at 10:23 AM Pali Rohár <pali@kernel.org> wrote:
> > On Sunday 04 September 2022 23:30:53 Dmitry Torokhov wrote:
>
> ...
>
> > > -             rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
> > > -                                                          "reset-gpios", 0,
> > > -                                                          GPIOD_OUT_LOW,
> > > -                                                          label);
> > > +             rp->reset_gpio = devm_fwnode_gpiod_get(dev,
> > > +                                                    of_fwnode_handle(port),
> > > +                                                    "reset",
> > > +                                                    GPIOD_OUT_LOW,
> > > +                                                    label);
> >
> > Why in pci-aardvark.c for PERST# reset-gpio you have used
> > devm_gpiod_get_optional() and here in pci-tegra.c you have used
> > devm_fwnode_gpiod_get()? I think that PERST# logic is same in both
> > drivers.
>
> It's not the same dev and its node in this case. There is one reset
> for _all_ ports, here is the reset on _per port_ basis.

Actually I'm wrong, the aardvark has only one port (?) to serve there.
In any case, here dev == dev->of_node, here dev != port.
Andy Shevchenko Sept. 5, 2022, 10:54 a.m. UTC | #5
On Mon, Sep 5, 2022 at 1:53 PM Pali Rohár <pali@kernel.org> wrote:
> On Monday 05 September 2022 13:49:21 Andy Shevchenko wrote:

...

> > It's not the same dev and its node in this case. There is one reset
> > for _all_ ports, here is the reset on _per port_ basis.
>
> aardvark is single port controller. So it is basically same.

Yep, just replied to my message.
Dmitry Torokhov Sept. 5, 2022, 10:49 p.m. UTC | #6
On Mon, Sep 05, 2022 at 09:19:02AM +0200, Pali Rohár wrote:
> On Sunday 04 September 2022 23:30:53 Dmitry Torokhov wrote:
> > I would like to limit (or maybe even remove) use of
> > [devm_]gpiod_get_from_of_node in drivers so that gpiolib can be cleaned
> > a bit, so let's switch to the generic device property API. It may even
> > help with handling secondary fwnodes when gpiolib is taught to handle
> > gpios described by swnodes.
> > 
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> > 
> > diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> > index 8e323e93be91..929f9363e94b 100644
> > --- a/drivers/pci/controller/pci-tegra.c
> > +++ b/drivers/pci/controller/pci-tegra.c
> > @@ -2202,10 +2202,11 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
> >  		 * and in this case fall back to using AFI per port register
> >  		 * to toggle PERST# SFIO line.
> >  		 */
> > -		rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
> > -							     "reset-gpios", 0,
> > -							     GPIOD_OUT_LOW,
> > -							     label);
> > +		rp->reset_gpio = devm_fwnode_gpiod_get(dev,
> > +						       of_fwnode_handle(port),
> > +						       "reset",
> > +						       GPIOD_OUT_LOW,
> > +						       label);
> 
> Why in pci-aardvark.c for PERST# reset-gpio you have used
> devm_gpiod_get_optional() and here in pci-tegra.c you have used
> devm_fwnode_gpiod_get()? I think that PERST# logic is same in both
> drivers.

I believe Andy already answered that, but in this driver we can have
several root ports described via subnodes of dev->of_node, and reset
GPIOs are attached to those subnodes. We are forced to use
devm_fwnode_gpiod_get() instead of devm_gpiod_get_optional() as we need
to supply the exact fwnode we need to look up GPIO in, and can not infer
it from the 'dev' parameter of devm_gpiod_get().

Thanks.
Linus Walleij Sept. 8, 2022, 8:13 a.m. UTC | #7
On Mon, Sep 5, 2022 at 8:31 AM Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:

> I would like to limit (or maybe even remove) use of
> [devm_]gpiod_get_from_of_node in drivers so that gpiolib can be cleaned
> a bit, so let's switch to the generic device property API. It may even
> help with handling secondary fwnodes when gpiolib is taught to handle
> gpios described by swnodes.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
diff mbox series

Patch

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 8e323e93be91..929f9363e94b 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -2202,10 +2202,11 @@  static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 		 * and in this case fall back to using AFI per port register
 		 * to toggle PERST# SFIO line.
 		 */
-		rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
-							     "reset-gpios", 0,
-							     GPIOD_OUT_LOW,
-							     label);
+		rp->reset_gpio = devm_fwnode_gpiod_get(dev,
+						       of_fwnode_handle(port),
+						       "reset",
+						       GPIOD_OUT_LOW,
+						       label);
 		if (IS_ERR(rp->reset_gpio)) {
 			if (PTR_ERR(rp->reset_gpio) == -ENOENT) {
 				rp->reset_gpio = NULL;