linux-kernel - [PATCH v9 8/9] spi: cadence: Change cs property reading.

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Date: Wed, 19 Jun 2024 07:17:14 -0700
From: Witold Sadowski <wsadowski@...vell.com>
To: <linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC: <broonie@...nel.org>, <robh@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <pthombar@...ence.com>, Witold Sadowski <wsadowski@...vell.com>,
        "Piyush
 Malgujar" <pmalgujar@...vell.com>
Subject: [PATCH v9 8/9] spi: cadence: Change cs property reading.

In current implementation cs property can be read only from
device-tree(for_each_available_child_of_node_scoped). Change it to fwnode
based read to allow property reading in ACPI case too.

Signed-off-by: Witold Sadowski <wsadowski@...vell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@...vell.com>
---
 drivers/spi/spi-cadence-xspi.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
index 9cf3624595ea..4edac7c8d73c 100644
--- a/drivers/spi/spi-cadence-xspi.c
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -811,15 +811,20 @@ static irqreturn_t cdns_xspi_irq_handler(int this_irq, void *dev)
 
 static int cdns_xspi_of_get_plat_data(struct platform_device *pdev)
 {
-	struct device_node *node_prop = pdev->dev.of_node;
+	struct fwnode_handle *fwnode_child;
 	unsigned int cs;
 
-	for_each_available_child_of_node_scoped(node_prop, node_child) {
-		if (of_property_read_u32(node_child, "reg", &cs)) {
+	device_for_each_child_node(&pdev->dev, fwnode_child) {
+		if (!fwnode_device_is_available(fwnode_child))
+			continue;
+
+		if (fwnode_property_read_u32(fwnode_child, "reg", &cs)) {
 			dev_err(&pdev->dev, "Couldn't get memory chip select\n");
+			fwnode_handle_put(fwnode_child);
 			return -ENXIO;
 		} else if (cs >= CDNS_XSPI_MAX_BANKS) {
 			dev_err(&pdev->dev, "reg (cs) parameter value too large\n");
+			fwnode_handle_put(fwnode_child);
 			return -ENXIO;
 		}
 	}
-- 
2.43.0