linux-kernel - [PATCH v5 4/4] spi: s3c64xx: allow controller-data to be optional

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Date:   Thu, 20 Jan 2022 18:57:47 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Andi Shyti <andi@...zian.org>, Mark Brown <broonie@...nel.org>,
        Sam Protsenko <semen.protsenko@...aro.org>,
        Pratyush Yadav <p.yadav@...com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-spi@...r.kernel.org
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v5 4/4] spi: s3c64xx: allow controller-data to be optional

The Samsung SoC SPI driver requires to provide controller-data node
for each of SPI peripheral device nodes.  Make this controller-data node
optional, so DTS could be simpler.

Suggested-by: Rob Herring <robh@...nel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
Reviewed-by: Andi Shyti <andi@...zian.org>
---
 drivers/spi/spi-s3c64xx.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 8755cd85e83c..386550fca81c 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -796,16 +796,14 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 		return ERR_PTR(-EINVAL);
 	}
 
-	data_np = of_get_child_by_name(slave_np, "controller-data");
-	if (!data_np) {
-		dev_err(&spi->dev, "child node 'controller-data' not found\n");
-		return ERR_PTR(-EINVAL);
-	}
-
 	cs = kzalloc(sizeof(*cs), GFP_KERNEL);
-	if (!cs) {
-		of_node_put(data_np);
+	if (!cs)
 		return ERR_PTR(-ENOMEM);
+
+	data_np = of_get_child_by_name(slave_np, "controller-data");
+	if (!data_np) {
+		dev_info(&spi->dev, "feedback delay set to default (0)\n");
+		return cs;
 	}
 
 	of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
-- 
2.32.0