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Thu, 07 Nov 2019 03:19:53 -0800 (PST) From: Lee Jones To: daniel.thompson@linaro.org, broonie@kernel.org, arnd@arndb.de, linus.walleij@linaro.org Subject: [PATCH 1/1] mfd: mfd-core: Honour Device Tree's request to disable a child-device Date: Thu, 7 Nov 2019 11:19:50 +0000 Message-Id: <20191107111950.1189-1-lee.jones@linaro.org> X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191107_031955_916461_74F5C4E3 X-CRM114-Status: GOOD ( 11.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: baohua@kernel.org, stephan@gerhold.net, linux-kernel@vger.kernel.org, Barry Song , Lee Jones , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Until now, MFD has assumed all child devices passed to it (via mfd_cells) are to be registered. It does not take into account requests from Device Tree and the like to disable child devices on a per-platform basis. Well now it does. Link: https://www.spinics.net/lists/arm-kernel/msg366309.html Link: https://lkml.org/lkml/2019/8/22/1350 Reported-by: Barry Song Reported-by: Stephan Gerhold Signed-off-by: Lee Jones --- drivers/mfd/mfd-core.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index cb3e0a14bbdd..f5a73af60dd4 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -152,6 +152,11 @@ static int mfd_add_device(struct device *parent, int id, if (parent->of_node && cell->of_compatible) { for_each_child_of_node(parent->of_node, np) { if (of_device_is_compatible(np, cell->of_compatible)) { + if (!of_device_is_available(np)) { + /* Ignore disabled devices error free */ + ret = 0; + goto fail_alias; + } pdev->dev.of_node = np; pdev->dev.fwnode = &np->fwnode; break; -- 2.24.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel