mirror of https://gitee.com/openkylin/linux.git
i2c: qup: Add command-line parameter to override SCL frequency
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>
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@ -155,6 +155,10 @@
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/* TAG length for DATA READ in RX FIFO */
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#define READ_RX_TAGS_LEN 2
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static unsigned int scl_freq;
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module_param_named(scl_freq, scl_freq, uint, 0444);
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MODULE_PARM_DESC(scl_freq, "SCL frequency override");
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/*
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* count: no of blocks
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* pos: current block number
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@ -1682,11 +1686,16 @@ static int qup_i2c_probe(struct platform_device *pdev)
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init_completion(&qup->xfer);
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platform_set_drvdata(pdev, qup);
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if (scl_freq) {
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dev_notice(qup->dev, "Using override frequency of %u\n", scl_freq);
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clk_freq = scl_freq;
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} else {
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ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq);
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if (ret) {
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dev_notice(qup->dev, "using default clock-frequency %d",
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DEFAULT_CLK_FREQ);
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}
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}
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if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
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qup->adap.algo = &qup_i2c_algo;
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