From: Sakari Ailus <sakari.ailus@linux.intel.com> To: Saravana Kannan <saravanak@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Sudeep Holla <sudeep.holla@arm.com>, Cristian Marussi <cristian.marussi@arm.com>, Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Thomas Gleixner <tglx@linutronix.de>, Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Magnus Damm <magnus.damm@gmail.com>, Len Brown <lenb@kernel.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Daniel Scally <djrscally@gmail.com>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Tony Lindgren <tony@atomide.com>, Linux Kernel Functional Testing <lkft@linaro.org>, Naresh Kamboju <naresh.kamboju@linaro.org>, Abel Vesa <abel.vesa@linaro.org>, Alexander Stein <alexander.stein@ew.tq-group.com>, Geert Uytterhoeven <geert@linux-m68k.org>, John Stultz <jstultz@google.com>, Doug Anderson <dianders@chromium.org>, Guenter Roeck <linux@roeck-us.net>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Maxim Kiselev <bigunclemax@gmail.com>, Maxim Kochetkov <fido_max@inbox.ru>, Miquel Raynal <miquel.raynal@bootlin.com>, Luca Weiss <luca.weiss@fairphone.com>, Colin Foster <colin.foster@in-advantage.com>, Martin Kepplinger <martin.kepplinger@puri.sm>, Jean-Philippe Brucker <jpb@kernel.org>, kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Subject: Re: [PATCH v2 09/11] of: property: Simplify of_link_to_phandle() Date: Mon, 30 Jan 2023 16:39:47 +0200 [thread overview] Message-ID: <Y9fWsxYJgNR0z6te@kekkonen.localdomain> (raw) In-Reply-To: <20230127001141.407071-10-saravanak@google.com> Hi Saravana, On Thu, Jan 26, 2023 at 04:11:36PM -0800, Saravana Kannan wrote: > The driver core now: > - Has the parent device of a supplier pick up the consumers if the > supplier never has a device created for it. > - Ignores a supplier if the supplier has no parent device and will never > be probed by a driver > > And already prevents creating a device link with the consumer as a > supplier of a parent. > > So, we no longer need to find the "compatible" node of the supplier or > do any other checks in of_link_to_phandle(). We simply need to make sure > that the supplier is available in DT. > > Signed-off-by: Saravana Kannan <saravanak@google.com> > --- > drivers/of/property.c | 84 +++++++------------------------------------ > 1 file changed, 13 insertions(+), 71 deletions(-) > > diff --git a/drivers/of/property.c b/drivers/of/property.c > index 134cfc980b70..c651aad6f34b 100644 > --- a/drivers/of/property.c > +++ b/drivers/of/property.c > @@ -1062,20 +1062,6 @@ of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode, > return of_device_get_match_data(dev); > } > > -static bool of_is_ancestor_of(struct device_node *test_ancestor, > - struct device_node *child) > -{ > - of_node_get(child); > - while (child) { > - if (child == test_ancestor) { > - of_node_put(child); > - return true; > - } > - child = of_get_next_parent(child); > - } > - return false; > -} > - > static struct device_node *of_get_compat_node(struct device_node *np) > { > of_node_get(np); > @@ -1106,71 +1092,27 @@ static struct device_node *of_get_compat_node_parent(struct device_node *np) > return node; > } > > -/** > - * of_link_to_phandle - Add fwnode link to supplier from supplier phandle > - * @con_np: consumer device tree node > - * @sup_np: supplier device tree node > - * > - * Given a phandle to a supplier device tree node (@sup_np), this function > - * finds the device that owns the supplier device tree node and creates a > - * device link from @dev consumer device to the supplier device. This function > - * doesn't create device links for invalid scenarios such as trying to create a > - * link with a parent device as the consumer of its child device. In such > - * cases, it returns an error. > - * > - * Returns: > - * - 0 if fwnode link successfully created to supplier > - * - -EINVAL if the supplier link is invalid and should not be created > - * - -ENODEV if struct device will never be create for supplier > - */ > -static int of_link_to_phandle(struct device_node *con_np, > +static void of_link_to_phandle(struct device_node *con_np, > struct device_node *sup_np) > { > - struct device *sup_dev; > - struct device_node *tmp_np = sup_np; > + struct device_node *tmp_np = of_node_get(sup_np); > > - /* > - * Find the device node that contains the supplier phandle. It may be > - * @sup_np or it may be an ancestor of @sup_np. > - */ > - sup_np = of_get_compat_node(sup_np); > - if (!sup_np) { > - pr_debug("Not linking %pOFP to %pOFP - No device\n", > - con_np, tmp_np); > - return -ENODEV; > - } > + /* Check that sup_np and its ancestors are available. */ > + while (tmp_np) { > + if (of_fwnode_handle(tmp_np)->dev) { > + of_node_put(tmp_np); > + break; > + } > > - /* > - * Don't allow linking a device node as a consumer of one of its > - * descendant nodes. By definition, a child node can't be a functional > - * dependency for the parent node. > - */ > - if (of_is_ancestor_of(con_np, sup_np)) { > - pr_debug("Not linking %pOFP to %pOFP - is descendant\n", > - con_np, sup_np); > - of_node_put(sup_np); > - return -EINVAL; > - } > + if (!of_device_is_available(tmp_np)) { > + of_node_put(tmp_np); > + return; > + } > > - /* > - * Don't create links to "early devices" that won't have struct devices > - * created for them. > - */ > - sup_dev = get_dev_from_fwnode(&sup_np->fwnode); > - if (!sup_dev && > - (of_node_check_flag(sup_np, OF_POPULATED) || > - sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) { > - pr_debug("Not linking %pOFP to %pOFP - No struct device\n", > - con_np, sup_np); > - of_node_put(sup_np); > - return -ENODEV; > + tmp_np = of_get_next_parent(tmp_np); > } > - put_device(sup_dev); > > fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); fwnode_link_add() returns int. Why is the return type of this function changed to void? > - of_node_put(sup_np); > - > - return 0; > } > > /** -- Regards, Sakari Ailus
WARNING: multiple messages have this Message-ID (diff)
From: Sakari Ailus <sakari.ailus@linux.intel.com> To: Saravana Kannan <saravanak@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Sudeep Holla <sudeep.holla@arm.com>, Cristian Marussi <cristian.marussi@arm.com>, Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Thomas Gleixner <tglx@linutronix.de>, Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Magnus Damm <magnus.damm@gmail.com>, Len Brown <lenb@kernel.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Daniel Scally <djrscally@gmail.com>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Tony Lindgren <tony@atomide.com>, Linux Kernel Functional Testing <lkft@linaro.org>, Naresh Kamboju <naresh.kamboju@linaro.org>, Abel Vesa <abel.vesa@linaro.org>, Alexander Stein <alexander.stein@ew.tq-group.com>, Geert Uytterhoeven <geert@linux-m68k.org>, John Stultz <jstultz@google.com>, Doug Anderson <dianders@chromium.org>, Guenter Roeck <linux@roeck-us.net>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Maxim Kiselev <bigunclemax@gmail.com>, Maxim Kochetkov <fido_max@inbox.ru>, Miquel Raynal <miquel.raynal@bootlin.com>, Luca Weiss <luca.weiss@fairphone.com>, Colin Foster <colin.foster@in-advantage.com>, Martin Kepplinger <martin.kepplinger@puri.sm>, Jean-Philippe Brucker <jpb@kernel.org>, kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Subject: Re: [PATCH v2 09/11] of: property: Simplify of_link_to_phandle() Date: Mon, 30 Jan 2023 16:39:47 +0200 [thread overview] Message-ID: <Y9fWsxYJgNR0z6te@kekkonen.localdomain> (raw) In-Reply-To: <20230127001141.407071-10-saravanak@google.com> Hi Saravana, On Thu, Jan 26, 2023 at 04:11:36PM -0800, Saravana Kannan wrote: > The driver core now: > - Has the parent device of a supplier pick up the consumers if the > supplier never has a device created for it. > - Ignores a supplier if the supplier has no parent device and will never > be probed by a driver > > And already prevents creating a device link with the consumer as a > supplier of a parent. > > So, we no longer need to find the "compatible" node of the supplier or > do any other checks in of_link_to_phandle(). We simply need to make sure > that the supplier is available in DT. > > Signed-off-by: Saravana Kannan <saravanak@google.com> > --- > drivers/of/property.c | 84 +++++++------------------------------------ > 1 file changed, 13 insertions(+), 71 deletions(-) > > diff --git a/drivers/of/property.c b/drivers/of/property.c > index 134cfc980b70..c651aad6f34b 100644 > --- a/drivers/of/property.c > +++ b/drivers/of/property.c > @@ -1062,20 +1062,6 @@ of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode, > return of_device_get_match_data(dev); > } > > -static bool of_is_ancestor_of(struct device_node *test_ancestor, > - struct device_node *child) > -{ > - of_node_get(child); > - while (child) { > - if (child == test_ancestor) { > - of_node_put(child); > - return true; > - } > - child = of_get_next_parent(child); > - } > - return false; > -} > - > static struct device_node *of_get_compat_node(struct device_node *np) > { > of_node_get(np); > @@ -1106,71 +1092,27 @@ static struct device_node *of_get_compat_node_parent(struct device_node *np) > return node; > } > > -/** > - * of_link_to_phandle - Add fwnode link to supplier from supplier phandle > - * @con_np: consumer device tree node > - * @sup_np: supplier device tree node > - * > - * Given a phandle to a supplier device tree node (@sup_np), this function > - * finds the device that owns the supplier device tree node and creates a > - * device link from @dev consumer device to the supplier device. This function > - * doesn't create device links for invalid scenarios such as trying to create a > - * link with a parent device as the consumer of its child device. In such > - * cases, it returns an error. > - * > - * Returns: > - * - 0 if fwnode link successfully created to supplier > - * - -EINVAL if the supplier link is invalid and should not be created > - * - -ENODEV if struct device will never be create for supplier > - */ > -static int of_link_to_phandle(struct device_node *con_np, > +static void of_link_to_phandle(struct device_node *con_np, > struct device_node *sup_np) > { > - struct device *sup_dev; > - struct device_node *tmp_np = sup_np; > + struct device_node *tmp_np = of_node_get(sup_np); > > - /* > - * Find the device node that contains the supplier phandle. It may be > - * @sup_np or it may be an ancestor of @sup_np. > - */ > - sup_np = of_get_compat_node(sup_np); > - if (!sup_np) { > - pr_debug("Not linking %pOFP to %pOFP - No device\n", > - con_np, tmp_np); > - return -ENODEV; > - } > + /* Check that sup_np and its ancestors are available. */ > + while (tmp_np) { > + if (of_fwnode_handle(tmp_np)->dev) { > + of_node_put(tmp_np); > + break; > + } > > - /* > - * Don't allow linking a device node as a consumer of one of its > - * descendant nodes. By definition, a child node can't be a functional > - * dependency for the parent node. > - */ > - if (of_is_ancestor_of(con_np, sup_np)) { > - pr_debug("Not linking %pOFP to %pOFP - is descendant\n", > - con_np, sup_np); > - of_node_put(sup_np); > - return -EINVAL; > - } > + if (!of_device_is_available(tmp_np)) { > + of_node_put(tmp_np); > + return; > + } > > - /* > - * Don't create links to "early devices" that won't have struct devices > - * created for them. > - */ > - sup_dev = get_dev_from_fwnode(&sup_np->fwnode); > - if (!sup_dev && > - (of_node_check_flag(sup_np, OF_POPULATED) || > - sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) { > - pr_debug("Not linking %pOFP to %pOFP - No struct device\n", > - con_np, sup_np); > - of_node_put(sup_np); > - return -ENODEV; > + tmp_np = of_get_next_parent(tmp_np); > } > - put_device(sup_dev); > > fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); fwnode_link_add() returns int. Why is the return type of this function changed to void? > - of_node_put(sup_np); > - > - return 0; > } > > /** -- Regards, Sakari Ailus _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-01-30 18:16 UTC|newest] Thread overview: 146+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-01-27 0:11 [PATCH v2 00/11] fw_devlink improvements Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 01/11] driver core: fw_devlink: Don't purge child fwnode's consumer links Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:21 ` Andy Shevchenko 2023-01-27 9:21 ` Andy Shevchenko 2023-01-28 7:33 ` Saravana Kannan 2023-01-28 7:33 ` Saravana Kannan 2023-01-30 12:04 ` Andy Shevchenko 2023-01-30 12:04 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 02/11] driver core: fw_devlink: Improve check for fwnode with no device/driver Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 03/11] soc: renesas: Move away from using OF_POPULATED for fw_devlink Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 8:11 ` Geert Uytterhoeven 2023-01-27 8:11 ` Geert Uytterhoeven 2023-01-28 7:18 ` Saravana Kannan 2023-01-28 7:18 ` Saravana Kannan 2023-01-30 8:42 ` Geert Uytterhoeven 2023-01-30 8:42 ` Geert Uytterhoeven 2023-01-30 20:00 ` Saravana Kannan 2023-01-30 20:00 ` Saravana Kannan 2023-01-31 8:14 ` Geert Uytterhoeven 2023-01-31 8:14 ` Geert Uytterhoeven 2023-02-04 22:30 ` Saravana Kannan 2023-02-04 22:30 ` Saravana Kannan 2023-01-27 9:25 ` Andy Shevchenko 2023-01-27 9:25 ` Andy Shevchenko 2023-01-27 9:30 ` Geert Uytterhoeven 2023-01-27 9:30 ` Geert Uytterhoeven 2023-01-27 9:44 ` Andy Shevchenko 2023-01-27 9:44 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 04/11] gpiolib: Clear the gpio_device's fwnode initialized flag before adding Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:27 ` Andy Shevchenko 2023-01-27 9:27 ` Andy Shevchenko 2023-01-28 7:33 ` Saravana Kannan 2023-01-28 7:33 ` Saravana Kannan 2023-01-30 12:05 ` Andy Shevchenko 2023-01-30 12:05 ` Andy Shevchenko 2023-01-30 14:31 ` Sudeep Holla 2023-01-30 14:31 ` Sudeep Holla 2023-01-30 15:14 ` Andy Shevchenko 2023-01-30 15:14 ` Andy Shevchenko 2023-01-31 4:01 ` Saravana Kannan 2023-01-31 4:01 ` Saravana Kannan 2023-01-31 10:13 ` Sudeep Holla 2023-01-31 10:13 ` Sudeep Holla 2023-02-04 22:32 ` Saravana Kannan 2023-02-04 22:32 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 05/11] driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:29 ` Andy Shevchenko 2023-01-27 9:29 ` Andy Shevchenko 2023-01-27 9:30 ` Andy Shevchenko 2023-01-27 9:30 ` Andy Shevchenko 2023-01-27 9:55 ` Geert Uytterhoeven 2023-01-27 9:55 ` Geert Uytterhoeven 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-30 12:08 ` Andy Shevchenko 2023-01-30 12:08 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 06/11] driver core: fw_devlink: Allow marking a fwnode link as being part of a cycle Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:33 ` Andy Shevchenko 2023-01-27 9:33 ` Andy Shevchenko 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-30 12:09 ` Andy Shevchenko 2023-01-30 12:09 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 07/11] driver core: fw_devlink: Consolidate device link flag computation Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 08/11] driver core: fw_devlink: Make cycle detection more robust Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:43 ` Andy Shevchenko 2023-01-27 9:43 ` Andy Shevchenko 2023-01-27 9:52 ` Geert Uytterhoeven 2023-01-27 9:52 ` Geert Uytterhoeven 2023-01-27 10:10 ` Andy Shevchenko 2023-01-27 10:10 ` Andy Shevchenko 2023-01-27 10:29 ` Geert Uytterhoeven 2023-01-27 10:29 ` Geert Uytterhoeven 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-30 12:15 ` Andy Shevchenko 2023-01-30 12:15 ` Andy Shevchenko 2023-01-30 14:36 ` Geert Uytterhoeven 2023-01-30 14:36 ` Geert Uytterhoeven 2023-01-30 15:16 ` Andy Shevchenko 2023-01-30 15:16 ` Andy Shevchenko 2023-01-27 0:11 ` [PATCH v2 09/11] of: property: Simplify of_link_to_phandle() Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-30 14:39 ` Sakari Ailus [this message] 2023-01-30 14:39 ` Sakari Ailus 2023-01-31 3:51 ` Saravana Kannan 2023-01-31 3:51 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 10/11] irqchip/irq-imx-gpcv2: Mark fwnode device as not initialized Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:51 ` Andy Shevchenko 2023-01-27 9:51 ` Andy Shevchenko 2023-01-28 7:34 ` Saravana Kannan 2023-01-28 7:34 ` Saravana Kannan 2023-01-27 0:11 ` [PATCH v2 11/11] firmware: arm_scmi: Set fwnode for the scmi_device Saravana Kannan 2023-01-27 0:11 ` Saravana Kannan 2023-01-27 9:52 ` Andy Shevchenko 2023-01-27 9:52 ` Andy Shevchenko 2023-01-27 10:48 ` Sudeep Holla 2023-01-27 10:48 ` Sudeep Holla 2023-01-27 20:30 ` [PATCH v2 00/11] fw_devlink improvements Colin Foster 2023-01-27 20:30 ` Colin Foster 2023-01-27 21:35 ` Saravana Kannan 2023-01-27 21:35 ` Saravana Kannan 2023-01-30 8:55 ` Naresh Kamboju 2023-01-30 8:55 ` Naresh Kamboju 2023-01-30 10:49 ` Marc Zyngier 2023-01-30 10:49 ` Marc Zyngier 2023-01-30 23:03 ` Saravana Kannan 2023-01-30 23:03 ` Saravana Kannan 2023-01-31 10:18 ` Sudeep Holla 2023-01-31 10:18 ` Sudeep Holla 2023-02-02 17:36 ` Maxim Kiselev 2023-02-02 17:36 ` Maxim Kiselev 2023-02-03 6:07 ` Saravana Kannan 2023-02-03 6:07 ` Saravana Kannan 2023-02-03 9:39 ` Maxim Kiselev 2023-02-03 9:39 ` Maxim Kiselev 2023-02-06 1:32 ` Saravana Kannan 2023-02-06 1:32 ` Saravana Kannan 2023-02-06 2:17 ` Saravana Kannan 2023-02-06 2:17 ` Saravana Kannan 2023-02-06 9:39 ` Miquel Raynal 2023-02-06 9:39 ` Miquel Raynal 2023-02-06 20:08 ` Saravana Kannan 2023-02-06 20:08 ` Saravana Kannan 2023-02-24 14:46 ` Miquel Raynal 2023-02-24 14:46 ` Miquel Raynal 2023-02-06 15:18 ` Rob Herring 2023-02-06 15:18 ` Rob Herring 2023-02-06 19:59 ` Saravana Kannan 2023-02-06 19:59 ` Saravana Kannan 2023-01-30 10:48 ` Miquel Raynal 2023-01-30 10:48 ` Miquel Raynal 2023-01-30 12:08 ` Maxim Kiselev 2023-01-30 12:08 ` Maxim Kiselev 2023-01-31 1:20 ` Saravana Kannan 2023-01-31 1:20 ` Saravana Kannan
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