| Message ID | 20220903-gpiod_get_from_of_node-remove-v1-1-b29adfb27a6c@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | Get rid of [devm_]gpiod_get_from_of_node() public APIs | expand |
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
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.
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.
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.
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.
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.
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 --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;
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>