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Tue, 28 Jan 2020 10:42:11 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id D4A6310002A; Tue, 28 Jan 2020 10:42:10 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id C990A21D3C0; Tue, 28 Jan 2020 10:42:10 +0100 (CET) Received: from localhost (10.75.127.44) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 28 Jan 2020 10:42:10 +0100 From: Amelie Delaunay To: Vinod Koul , Dan Williams , Maxime Coquelin , Alexandre Torgue Subject: [PATCH 4/4] dmaengine: stm32-dmamux: driver defers probe for clock and reset Date: Tue, 28 Jan 2020 10:41:58 +0100 Message-ID: <20200128094158.20361-5-amelie.delaunay@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200128094158.20361-1-amelie.delaunay@st.com> References: <20200128094158.20361-1-amelie.delaunay@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG6NODE2.st.com (10.75.127.17) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-01-28_02:2020-01-24, 2020-01-28 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200128_014220_943416_276D96DD X-CRM114-Status: GOOD ( 16.37 ) X-Spam-Score: -0.9 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [62.209.51.94 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 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: Amelie Delaunay , linux-kernel@vger.kernel.org, Pierre-Yves MORDRET , dmaengine@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Etienne Carriere Changes STM32 DMAMUX driver to defer its probe operation when reset controller is expected but has not been probed yet. Changes error traces when failing to get a system resource so that it is not printed on failure with deferred probing. Signed-off-by: Etienne Carriere Signed-off-by: Amelie Delaunay --- drivers/dma/stm32-dmamux.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index 1dfecbac64cf..12f7637e13a1 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -254,8 +254,8 @@ static int stm32_dmamux_probe(struct platform_device *pdev) stm32_dmamux->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(stm32_dmamux->clk)) { ret = PTR_ERR(stm32_dmamux->clk); - if (ret == -EPROBE_DEFER) - dev_info(&pdev->dev, "Missing controller clock\n"); + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "Missing clock controller\n"); return ret; } @@ -266,7 +266,11 @@ static int stm32_dmamux_probe(struct platform_device *pdev) } rst = devm_reset_control_get(&pdev->dev, NULL); - if (!IS_ERR(rst)) { + if (IS_ERR(rst)) { + ret = PTR_ERR(rst); + if (ret == -EPROBE_DEFER) + goto err_clk; + } else { reset_control_assert(rst); udelay(2); reset_control_deassert(rst); @@ -291,7 +295,12 @@ static int stm32_dmamux_probe(struct platform_device *pdev) ret = of_dma_router_register(node, stm32_dmamux_route_allocate, &stm32_dmamux->dmarouter); if (ret) - clk_disable_unprepare(stm32_dmamux->clk); + goto err_clk; + + return 0; + +err_clk: + clk_disable_unprepare(stm32_dmamux->clk); return ret; }