From patchwork Fri Aug 4 16:17:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13342088 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 148ECC001DF for ; Fri, 4 Aug 2023 16:17:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229699AbjHDQRs (ORCPT ); Fri, 4 Aug 2023 12:17:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35326 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229499AbjHDQRr (ORCPT ); Fri, 4 Aug 2023 12:17:47 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1BB0B46B1; Fri, 4 Aug 2023 09:17:44 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.01,255,1684767600"; d="scan'208";a="171950200" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 05 Aug 2023 01:17:44 +0900 Received: from localhost.localdomain (unknown [10.226.93.35]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 8805040116B5; Sat, 5 Aug 2023 01:17:39 +0900 (JST) From: Biju Das To: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , Alexandre Belloni , Jonathan Cameron , "Rafael J. Wysocki" Cc: Biju Das , linux-acpi@vger.kernel.org, Dmitry Torokhov , Andi Shyti , Wolfram Sang , Geert Uytterhoeven , linux-rtc@vger.kernel.org, linux-iio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v7 1/4] drivers: fwnode: Extend device_get_match_data() to struct bus_type Date: Fri, 4 Aug 2023 17:17:25 +0100 Message-Id: <20230804161728.394920-2-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> References: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Extend device_get_match_data() to buses (for eg: I2C) by adding a callback device_get_match_data() to struct bus_type() and call this method as a fallback for generic fwnode based device_get_match_data(). Suggested-by: Dmitry Torokhov Signed-off-by: Biju Das Reviewed-by: Andy Shevchenko Reviewed-by: Sakari Ailus Acked-by: Greg Kroah-Hartman --- v6->v7: * Added ack from Greg Kroah-Hartman. v5->v6: * Added Rb tag from Sakari. v4->v5: * No change v3->v4: * Documented corner case. v2->v3: * Added Rb tag from Andy. RFC v1-> v2: * Replaced "Signed-off-by"->"Suggested-by" tag for Dmitry. * Documented device_get_match_data(). * Added multiple returns to make code path for generic fwnode-based lookup faster. --- drivers/base/property.c | 27 ++++++++++++++++++++++++++- include/linux/device/bus.h | 3 +++ 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/base/property.c b/drivers/base/property.c index 8c40abed7852..a3c188cf68bb 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1275,9 +1275,34 @@ int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode, } EXPORT_SYMBOL(fwnode_graph_parse_endpoint); +/** + * device_get_match_data - get match data from OF/ACPI/Bus match tables + * @dev: device to find the match data + * + * Find match data using generic fwnode-based lookup and if there is no + * match, call the bus->get_match_data() for finding match data. + * + * Return: a match data pointer or NULL if there is no match in the matching + * table. + * + * Besides the fact that some drivers abuse the device ID driver_data type + * and claim it to be integer, for the bus specific ID tables the driver_data + * may be defined as kernel_ulong_t. For these tables 0 is a valid response, + * but not for this function. It's recommended to convert those either to avoid + * 0 or use a real pointer to the predefined driver data. + */ const void *device_get_match_data(const struct device *dev) { - return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev); + const void *data; + + data = fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev); + if (data) + return data; + + if (dev->bus && dev->bus->get_match_data) + return dev->bus->get_match_data(dev); + + return NULL; } EXPORT_SYMBOL_GPL(device_get_match_data); diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h index ae10c4322754..2e15b0ae5384 100644 --- a/include/linux/device/bus.h +++ b/include/linux/device/bus.h @@ -60,6 +60,7 @@ struct fwnode_handle; * this bus. * @dma_cleanup: Called to cleanup DMA configuration on a device on * this bus. + * @get_match_data: Called to get match data on a device on this bus. * @pm: Power management operations of this bus, callback the specific * device driver's pm-ops. * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU @@ -102,6 +103,8 @@ struct bus_type { int (*dma_configure)(struct device *dev); void (*dma_cleanup)(struct device *dev); + const void *(*get_match_data)(const struct device *dev); + const struct dev_pm_ops *pm; const struct iommu_ops *iommu_ops; From patchwork Fri Aug 4 16:17:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13342089 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E77D4C04A94 for ; Fri, 4 Aug 2023 16:17:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229584AbjHDQRy (ORCPT ); Fri, 4 Aug 2023 12:17:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229615AbjHDQRu (ORCPT ); Fri, 4 Aug 2023 12:17:50 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 4B51EB2; Fri, 4 Aug 2023 09:17:49 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.01,255,1684767600"; d="scan'208";a="175631504" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 05 Aug 2023 01:17:49 +0900 Received: from localhost.localdomain (unknown [10.226.93.35]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 71B5240116CC; Sat, 5 Aug 2023 01:17:45 +0900 (JST) From: Biju Das To: Wolfram Sang Cc: Biju Das , linux-i2c@vger.kernel.org, Geert Uytterhoeven , Dmitry Torokhov , Andy Shevchenko , Andi Shyti , Alexandre Belloni , Jonathan Cameron , linux-rtc@vger.kernel.org, linux-iio@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v7 2/4] i2c: Enhance i2c_get_match_data() Date: Fri, 4 Aug 2023 17:17:26 +0100 Message-Id: <20230804161728.394920-3-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> References: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Enhance i2c_get_match_data() for a faster path for device_get_match_data(). While at it, add const to struct i2c_driver to prevent overriding the driver pointer. Suggested-by: Andy Shevchenko Signed-off-by: Biju Das Reviewed-by: Andy Shevchenko --- v6->v7: * Updated commit description by removing unnecessary wrapping. * Moved the patch from #3 to #2. * Added Rb tag from Andy v6: * Separate patch to prepare for better difference for i2c_match_id() changes. --- drivers/i2c/i2c-core-base.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 60746652fd52..7005dfe64066 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -116,20 +116,19 @@ EXPORT_SYMBOL_GPL(i2c_match_id); const void *i2c_get_match_data(const struct i2c_client *client) { - struct i2c_driver *driver = to_i2c_driver(client->dev.driver); + const struct i2c_driver *driver = to_i2c_driver(client->dev.driver); const struct i2c_device_id *match; const void *data; data = device_get_match_data(&client->dev); - if (!data) { - match = i2c_match_id(driver->id_table, client); - if (!match) - return NULL; + if (data) + return data; - data = (const void *)match->driver_data; - } + match = i2c_match_id(driver->id_table, client); + if (!match) + return NULL; - return data; + return (const void *)match->driver_data; } EXPORT_SYMBOL(i2c_get_match_data); From patchwork Fri Aug 4 16:17:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13342090 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C1AFC3DA40 for ; Fri, 4 Aug 2023 16:17:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229711AbjHDQRz (ORCPT ); Fri, 4 Aug 2023 12:17:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229615AbjHDQRy (ORCPT ); Fri, 4 Aug 2023 12:17:54 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8A159170F; Fri, 4 Aug 2023 09:17:53 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.01,255,1684767600"; d="scan'208";a="175631511" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 05 Aug 2023 01:17:53 +0900 Received: from localhost.localdomain (unknown [10.226.93.35]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id A6E1140116B5; Sat, 5 Aug 2023 01:17:49 +0900 (JST) From: Biju Das To: Wolfram Sang Cc: Biju Das , linux-i2c@vger.kernel.org, Geert Uytterhoeven , Dmitry Torokhov , Andy Shevchenko , Andi Shyti , Alexandre Belloni , Jonathan Cameron , linux-rtc@vger.kernel.org, linux-iio@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v7 3/4] i2c: i2c-core-of: Convert i2c_of_match_device_sysfs() to non-static Date: Fri, 4 Aug 2023 17:17:27 +0100 Message-Id: <20230804161728.394920-4-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> References: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Currently i2c_of_match_device_sysfs() is used by i2c_of_match_device(). Convert this to non-static function for finding match data for the I2C sysfs interface using i2c_device_get_match_data() for code reuse. While at it, fix the below issues:  1) Replace 'of_device_id*'->'of_device_id *' in function definition.  2) Fix the alignment in the function definition.  3) Change the struct i2c_client parameter as const to avoid overriding the client pointer. Suggested-by: Andy Shevchenko Suggested-by: Dmitry Torokhov Signed-off-by: Biju Das Reviewed-by: Andy Shevchenko --- v6->v7: * Moved from patch#2 to patch#3. v5->v6: * Added Rb tag from Andy. * Moved to patch#2 v5: * Split from patch #3 * Removed export symbol --- drivers/i2c/i2c-core-of.c | 4 ++-- drivers/i2c/i2c-core.h | 9 +++++++++ 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c index a6c407d36800..33832622f436 100644 --- a/drivers/i2c/i2c-core-of.c +++ b/drivers/i2c/i2c-core-of.c @@ -113,9 +113,9 @@ void of_i2c_register_devices(struct i2c_adapter *adap) of_node_put(bus); } -static const struct of_device_id* +const struct of_device_id * i2c_of_match_device_sysfs(const struct of_device_id *matches, - struct i2c_client *client) + const struct i2c_client *client) { const char *name; diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h index 1247e6e6e975..e4d397b67989 100644 --- a/drivers/i2c/i2c-core.h +++ b/drivers/i2c/i2c-core.h @@ -82,8 +82,17 @@ static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { #ifdef CONFIG_OF void of_i2c_register_devices(struct i2c_adapter *adap); +const struct of_device_id * +i2c_of_match_device_sysfs(const struct of_device_id *matches, + const struct i2c_client *client); #else static inline void of_i2c_register_devices(struct i2c_adapter *adap) { } +static inline const struct of_device_id * +i2c_of_match_device_sysfs(const struct of_device_id *matches, + const struct i2c_client *client) +{ + return NULL; +} #endif extern struct notifier_block i2c_of_notifier; From patchwork Fri Aug 4 16:17:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13342091 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9CF2C001DE for ; Fri, 4 Aug 2023 16:18:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230100AbjHDQSE (ORCPT ); Fri, 4 Aug 2023 12:18:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229851AbjHDQSB (ORCPT ); Fri, 4 Aug 2023 12:18:01 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 275F0B2; Fri, 4 Aug 2023 09:17:58 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.01,255,1684767600"; d="scan'208";a="171950234" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 05 Aug 2023 01:17:57 +0900 Received: from localhost.localdomain (unknown [10.226.93.35]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id DE4E040116CC; Sat, 5 Aug 2023 01:17:53 +0900 (JST) From: Biju Das To: Wolfram Sang Cc: Biju Das , linux-i2c@vger.kernel.org, Geert Uytterhoeven , Dmitry Torokhov , Andy Shevchenko , Andi Shyti , Alexandre Belloni , Jonathan Cameron , linux-rtc@vger.kernel.org, linux-iio@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v7 4/4] i2c: Add i2c_device_get_match_data() callback Date: Fri, 4 Aug 2023 17:17:28 +0100 Message-Id: <20230804161728.394920-5-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> References: <20230804161728.394920-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Add i2c_device_get_match_data() callback to struct bus_type. While at it, introduced i2c_get_match_data_helper() to avoid code duplication with i2c_get_match_data(). Suggested-by: Dmitry Torokhov Suggested-by: Andy Shevchenko Signed-off-by: Biju Das Reviewed-by: Andy Shevchenko --- v6->v7: * Updated typo in commit description struct bus_type()->struct bus_type. * Added Rb tag from Andy. v5->v6: * Merged with patch#3 from v5. * Separate patch#3 to prepare for better difference for i2c_match_id() changes. v4->v5: * Added const struct device_driver variable 'drv' in i2c_device_get_match _data(). * For code readability and maintenance perspective, added separate NULL check for drv and client variable and added comment for NULL check for drv variable. v3->v4: * Dropped struct i2c_driver parameter from i2c_get_match_data_helper() * Split I2C sysfs handling in separate patch. v2->v3: * Extended to support i2c_of_match_device() as suggested by Andy. * Changed i2c_of_match_device_sysfs() as non-static function as it is needed for i2c_device_get_match_data(). * Added a TODO comment to use i2c_verify_client() when it accepts const pointer. * Added multiple returns to make code path for device_get_match_data() faster in i2c_get_match_data(). RFC v1->v2: * Replaced "Signed-off-by"->"Suggested-by" tag for Dmitry. * Fixed build warnings reported by kernel test robot * Added const qualifier to return type and parameter struct i2c_driver in i2c_get_match_data_helper(). * Added const qualifier to struct i2c_driver in i2c_get_match_data() * Dropped driver variable from i2c_device_get_match_data() * Replaced to_i2c_client with logic for assigning verify_client as it returns non const pointer. --- drivers/i2c/i2c-core-base.c | 53 ++++++++++++++++++++++++++++++++----- 1 file changed, 47 insertions(+), 6 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 7005dfe64066..d543460e47c2 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -114,15 +114,10 @@ const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, } EXPORT_SYMBOL_GPL(i2c_match_id); -const void *i2c_get_match_data(const struct i2c_client *client) +static const void *i2c_get_match_data_helper(const struct i2c_client *client) { const struct i2c_driver *driver = to_i2c_driver(client->dev.driver); const struct i2c_device_id *match; - const void *data; - - data = device_get_match_data(&client->dev); - if (data) - return data; match = i2c_match_id(driver->id_table, client); if (!match) @@ -130,6 +125,51 @@ const void *i2c_get_match_data(const struct i2c_client *client) return (const void *)match->driver_data; } + +static const void *i2c_device_get_match_data(const struct device *dev) +{ + const struct device_driver *drv = dev->driver; + const struct i2c_client *client; + const void *data; + + /* + * It is not guaranteed that the function is always called on a device + * bound to a driver (even though we normally expect this to be the + * case). + */ + if (!drv) + return NULL; + + /* TODO: use i2c_verify_client() when it accepts const pointer */ + client = (dev->type == &i2c_client_type) ? to_i2c_client(dev) : NULL; + if (!client) + return NULL; + + data = i2c_get_match_data_helper(client); + if (data) + return data; + + if (drv->of_match_table) { + const struct of_device_id *match; + + match = i2c_of_match_device_sysfs(drv->of_match_table, client); + if (match) + return match->data; + } + + return NULL; +} + +const void *i2c_get_match_data(const struct i2c_client *client) +{ + const void *data; + + data = device_get_match_data(&client->dev); + if (data) + return data; + + return i2c_get_match_data_helper(client); +} EXPORT_SYMBOL(i2c_get_match_data); static int i2c_device_match(struct device *dev, struct device_driver *drv) @@ -694,6 +734,7 @@ struct bus_type i2c_bus_type = { .probe = i2c_device_probe, .remove = i2c_device_remove, .shutdown = i2c_device_shutdown, + .get_match_data = i2c_device_get_match_data, }; EXPORT_SYMBOL_GPL(i2c_bus_type);