Hi Bjorn,
El 20/02/14 21:38, Bjorn Andersson escribió:
This bus driver supports the QUP i2c hardware controller in the Qualcomm SOCs.
The Qualcomm Universal Peripheral Engine (QUP) is a general purpose data path
engine with input/output FIFOs and an embedded i2c mini-core. The driver
supports FIFO mode (for low bandwidth applications) and block mode (interrupt
generated for each block-size data transfer).
Cc: Andy Gross <agross@xxxxxxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
---
I'm not familiar with the subsystem nor the hardware, so I had a look
around for general stuff. I have some minor comments to make on the
probe code.
(snip)
+static int qup_i2c_probe(struct platform_device *pdev)
+{
+ static const int blk_sizes[] = {4, 16, 32};
+ struct device_node *node = pdev->dev.of_node;
+ struct qup_i2c_dev *qup;
+ unsigned long one_bit_t;
+ struct resource *res;
+ u32 val, io_mode, hw_ver, size;
+ int ret, fs_div, hs_div;
+ int src_clk_freq;
+ int clk_freq;
+
+ qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
+ if (!qup)
+ return -ENOMEM;
+
+ qup->dev = &pdev->dev;
+ init_completion(&qup->xfer);
+ platform_set_drvdata(pdev, qup);
+
+ clk_freq = 100000;
+ if (!of_property_read_u32(node, "clock-frequency", &val))
+ clk_freq = val;
val will be modified only if no error occurs, so you may rewrite this
bit as
+ u32 clk_freq = 100000;
...
+ of_property_read_u32(node, "clock-frequency", &clk_freq)
+
+ /* We support frequencies up to FAST Mode (400KHz) */
+ if (clk_freq <= 0 || clk_freq > 400000) {
And you can drop the < check when it's unsigned.
+ dev_err(qup->dev, "clock frequency not supported %d\n",
+ clk_freq);
+ return -EIO;
EIO?
Cheers,
Emilio
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