i2c: qup: Add command-line parameter to override SCL frequency (d9f52281) · Commits · 戴 / test

Add a module parameter to override SCL frequency provided by firmware. This can be useful when testing spec compliance for I2C modes or when debugging issues across multiple operating frequencies. Signed-off-by:

Austin Christ <austinwc@codeaurora.org> Reviewed-by:

Sricharan R <sricharan@codeaurora.org> Reviewed-by:

Andy Gross <andy.gross@linaro.org> Signed-off-by:

Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-qup.c

+13 −4

Original line number	Diff line number	Diff line
		@@ -155,6 +155,10 @@
		/* TAG length for DATA READ in RX FIFO */
		#define READ_RX_TAGS_LEN 2

		static unsigned int scl_freq;
		module_param_named(scl_freq, scl_freq, uint, 0444);
		MODULE_PARM_DESC(scl_freq, "SCL frequency override");

		/*
		* count: no of blocks
		* pos: current block number
		@@ -1682,11 +1686,16 @@ static int qup_i2c_probe(struct platform_device *pdev)
		init_completion(&qup->xfer);
		platform_set_drvdata(pdev, qup);

		if (scl_freq) {
		dev_notice(qup->dev, "Using override frequency of %u\n", scl_freq);
		clk_freq = scl_freq;
		} else {
		ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq);
		if (ret) {
		dev_notice(qup->dev, "using default clock-frequency %d",
		DEFAULT_CLK_FREQ);
		}
		}

		if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
		qup->adap.algo = &qup_i2c_algo;

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