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[4/4] i2c: qup: Add command-line parameter to override SCL frequency

Message ID 1522871100-3621-5-git-send-email-austinwc@codeaurora.org (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Austin Christ April 4, 2018, 7:45 p.m. UTC 
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>
---
 drivers/i2c/busses/i2c-qup.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)
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Patch

diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 2a88611..a20b446 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 (acpi_match_device(qup_i2c_acpi_match, qup->dev)) {