linux-kernel - [PATCH 08/14] spi: axi-spi-engine: check for valid clock rate

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Message-ID: <20231117-axi-spi-engine-series-1-v1-8-cc59db999b87@baylibre.com>
Date:   Fri, 17 Nov 2023 14:12:59 -0600
From:   David Lechner <dlechner@...libre.com>
To:     linux-spi@...r.kernel.org, devicetree@...r.kernel.org
Cc:     David Lechner <dlechner@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 08/14] spi: axi-spi-engine: check for valid clock rate

This adds a check for a valid SCLK rate in the axi-spi-engine driver
during probe. A valid rate is required to get accurate timing for delays
and by not allowing 0 we can avoid divide by zero errors later without
additional checks.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/spi/spi-axi-spi-engine.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index 819744246952..8a6fbb3bb3f1 100644
--- a/drivers/spi/spi-axi-spi-engine.c
+++ b/drivers/spi/spi-axi-spi-engine.c
@@ -532,6 +532,9 @@ static int spi_engine_probe(struct platform_device *pdev)
 	host->transfer_one_message = spi_engine_transfer_one_message;
 	host->num_chipselect = 8;
 
+	if (host->max_speed_hz == 0)
+		return dev_err_probe(&pdev->dev, -EINVAL, "spi_clk rate is 0");
+
 	ret = devm_spi_register_controller(&pdev->dev, host);
 	if (ret)
 		return ret;

-- 
2.42.0