From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 10 Mar 2023 10:44:00 +0100 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1paZI7-00FviH-Gs for lore@lore.pengutronix.de; Fri, 10 Mar 2023 10:44:00 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1paZI7-0006kG-4z for lore@pengutronix.de; Fri, 10 Mar 2023 10:43:59 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To: Cc:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Mrn3mfBV6yur/SMT41q7LTXu+CcdtHYLZlza0AlAxjE=; b=IUgoqQDUOz/Ottd0RlfqcAw4DO 3569a3VK6lvjWPu1nduFSMbrUll5u4DeWuAGfYQtrW0390QnEvcasyH26TKTynzYeeVclmUzo1KFv YGhzvMI0q19Mtq6ci8I0I+zUc+kf6jQOJh/4aeYE0bVnMaW0VLAmaX7aqGWhaN9YYfAb+mBJhtWDF kdPDj7fYUBiz0cW1oQaAuEvBR7ihEKINeKd97w1fkaElfHlrtZYv8j91UJnEbhiZaVfHBVK3vCsPK YIHkhVTc7UB5Eye1fjrXhTcUWOvHYKCoATfpwZbaYZUrAruP9+3IynzIdMOd6dnGCJ24GzkP6oFHn fkTniBZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1paZGj-00Dz7q-RE; Fri, 10 Mar 2023 09:42:33 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1paZGd-00Dz4j-Jq for barebox@lists.infradead.org; Fri, 10 Mar 2023 09:42:29 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1paZGb-0006Lx-BZ; Fri, 10 Mar 2023 10:42:25 +0100 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1paZGa-00393x-Na; Fri, 10 Mar 2023 10:42:24 +0100 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1paZGZ-00B49r-Hv; Fri, 10 Mar 2023 10:42:23 +0100 From: Sascha Hauer To: Barebox List Date: Fri, 10 Mar 2023 10:42:21 +0100 Message-Id: <20230310094222.2538259-7-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230310094222.2538259-1-s.hauer@pengutronix.de> References: <20230310094222.2538259-1-s.hauer@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230310_014227_764288_8D31DE3D X-CRM114-Status: GOOD ( 15.94 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v3 6/7] spi: implement rescan X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) Implement rescan to register and probe newly added devices via device tree overlays. While this is easy to do at SPI core level this is not the whole truth. Many SPI controllers do not use their native chipselects for the SPI devices, but GPIOs instead. These currently won't be rescanned when new devices are added, so the chipselects for the new devices must be be present in the base device tree already. You have been warned. Signed-off-by: Sascha Hauer --- drivers/spi/spi.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 3684647f6e..584d4ab777 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -29,6 +29,7 @@ struct boardinfo { }; static LIST_HEAD(board_list); +static LIST_HEAD(spi_controller_list); /** * spi_new_device - instantiate one new SPI device @@ -120,6 +121,12 @@ static void spi_of_register_slaves(struct spi_controller *ctrl) for_each_available_child_of_node(node, n) { struct spi_board_info chip = {}; + if (n->dev) { + dev_dbg(ctrl->dev, "skipping already registered %s\n", + dev_name(n->dev)); + continue; + } + chip.name = xstrdup(n->name); chip.bus_num = ctrl->bus_num; /* Mode (clock phase/polarity/etc.) */ @@ -142,6 +149,17 @@ static void spi_of_register_slaves(struct spi_controller *ctrl) } } +static void spi_controller_rescan(struct device *dev) +{ + struct spi_controller *ctrl; + + list_for_each_entry(ctrl, &spi_controller_list, list) { + if (ctrl->dev != dev) + continue; + spi_of_register_slaves(ctrl); + } +} + /** * spi_register_board_info - register SPI devices for a given board * @info: array of chip descriptors @@ -196,8 +214,6 @@ static void scan_boardinfo(struct spi_controller *ctrl) } } -static LIST_HEAD(spi_controller_list); - static int spi_controller_check_ops(struct spi_controller *ctlr) { /* @@ -274,6 +290,9 @@ int spi_register_controller(struct spi_controller *ctrl) scan_boardinfo(ctrl); status = 0; + if (!ctrl->dev->rescan) + ctrl->dev->rescan = spi_controller_rescan; + return status; } EXPORT_SYMBOL(spi_register_controller); -- 2.30.2