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From: Clark Wang <xiaoning.wang@nxp.com>
To: broonie@kernel.org
Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 4/5] spi: lpspi: handle EPROBE_DEFER when get cs-gpios number
Date: Tue, 14 Jul 2020 15:52:50 +0800	[thread overview]
Message-ID: <20200714075251.12777-5-xiaoning.wang@nxp.com> (raw)
In-Reply-To: <20200714075251.12777-1-xiaoning.wang@nxp.com>

From: Fabrice Goucem <fabrice.goucem@nxp.com>

If SPI is probed before the GPIO driver, it may miss the cs-gpio
configuration in dtb.
Add defer probe handler to wait GPIO driver probe.

Signed-off-by: Fabrice Goucem <fabrice.goucem@nxp.com>
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
---
 drivers/spi/spi-fsl-lpspi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 6fb77f0f657a..05b6ecd82974 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -887,6 +887,11 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 		for (i = 0; i < controller->num_chipselect; i++) {
 			int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
 
+			if (cs_gpio == -EPROBE_DEFER) {
+				ret = -EPROBE_DEFER;
+				goto out_controller_put;
+			}
+
 			if (!gpio_is_valid(cs_gpio) && lpspi_platform_info)
 				cs_gpio = lpspi_platform_info->chipselect[i];
 
-- 
2.17.1


  parent reply	other threads:[~2020-07-14  7:52 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14  7:52 [PATCH 0/5] Some bug fix for lpspi Clark Wang
2020-07-14  7:52 ` [PATCH 1/5] spi: lpspi: fix the imbalance of runtime pm function call Clark Wang
2020-07-14  7:52 ` [PATCH 2/5] spi: lpspi: add NULL check when probe device Clark Wang
2020-07-21 23:44   ` Mark Brown
2020-07-14  7:52 ` [PATCH 3/5] spi: lpspi: fix kernel warning dump when probe fail after calling spi_register Clark Wang
2020-07-14 11:37   ` Mark Brown
2020-07-21 22:47   ` Mark Brown
2020-07-14  7:52 ` Clark Wang [this message]
2020-07-14  7:52 ` [PATCH 5/5] spi: lpspi: fix using CS discontinuously on i.MX8DXLEVK Clark Wang
2020-07-22 13:45 ` [PATCH 0/5] Some bug fix for lpspi Mark Brown

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