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dmaengine: stm32-dmamux: driver defers probe for clock and reset

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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 <etienne.carriere@st.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Link: https://lore.kernel.org/r/20200128094158.20361-5-amelie.delaunay@st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Etienne Carriere 2020-01-28 10:41:58 +01:00 committed by Vinod Koul
parent d04d2f620d
commit 6cc7089764
1 changed files with 13 additions and 4 deletions
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17
drivers/dma/stm32-dmamux.c
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@ -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;
}