diff options
| author | Austin Christ <austinwc@codeaurora.org> | 2018-05-10 19:13:57 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2018-05-29 20:58:50 +0300 |
| commit | d9f52281bc09bd49374486f5e21fad7b8d3a5b3c (patch) | |
| tree | a5af9722d6794248a5c5ce6d22d55806a3a63f86 /drivers/i2c/busses | |
| parent | 71fbafcc45fed7c647987495900b8f6ff29fc5aa (diff) | |
| download | linux-d9f52281bc09bd49374486f5e21fad7b8d3a5b3c.tar.xz | |
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>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-qup.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index f87f29f5be65..c1bbeaae2095 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -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 @@ -1682,10 +1686,15 @@ static int qup_i2c_probe(struct platform_device *pdev) init_completion(&qup->xfer); platform_set_drvdata(pdev, qup); - 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 (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")) { |