From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 08 Mar 2023 15:26:52 +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 1pZukl-00DfYL-NE for lore@lore.pengutronix.de; Wed, 08 Mar 2023 15:26:52 +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 1pZukk-0003bI-Oe for lore@pengutronix.de; Wed, 08 Mar 2023 15:26:52 +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=Rz8id8mHtC7GhIqhWes2hHoffiKXr+eOeGboq0gfAKo=; b=EcRIiTjvgzzUnOJBYTyQEgeNOh y+fQVYhJ9lx4ER+HNVai94xP8EUS6o4Xj+B48TpOkGG09qCI3BPfBaXL1wswo1cINBxrSl7UY1JWT Qbf5Vz/8mzCKJ6PP7ncQjysnOfdfvn8zrLaAAqJSOisU07R5UkxNqq770v8uL5UXpR0A6f+dqt5l1 rOKIAOug6aB/YBshktGbFQIlXYtwtmusrFu4LLKR7y2hBrPgA+bxAtEvNyl7wWyibf/luy/AvGDgx zgEs8ZdpjFL8FnxHc9L7MLEh6P2XqYebbRwok07km2JPfURx08yw4g/X2FjS8lqTLEH9cOOYg0gY/ GcUdhrqg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZujN-005Qoz-Vt; Wed, 08 Mar 2023 14:25:26 +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 1pZujF-005Qm6-LP for barebox@lists.infradead.org; Wed, 08 Mar 2023 14:25:20 +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 1pZuj6-0002wp-Bw; Wed, 08 Mar 2023 15:25:08 +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 1pZuQO-002jGA-3o; Wed, 08 Mar 2023 15:05:48 +0100 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1pZuQM-00E7mL-I4; Wed, 08 Mar 2023 15:05:46 +0100 From: Sascha Hauer To: Barebox List Date: Wed, 8 Mar 2023 15:05:44 +0100 Message-Id: <20230308140545.3366052-7-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230308140545.3366052-1-s.hauer@pengutronix.de> References: <20230308140545.3366052-1-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-20230308_062517_716300_809D4858 X-CRM114-Status: GOOD ( 16.35 ) 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 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 | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 3684647f6e..632c2dbc4a 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, "of_i2c: 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 +149,19 @@ static void spi_of_register_slaves(struct spi_controller *ctrl) } } +static int 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); + } + + return 0; +} + /** * spi_register_board_info - register SPI devices for a given board * @info: array of chip descriptors @@ -196,8 +216,6 @@ 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 +292,9 @@ 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