Hi,
On Fri, Mar 23, 2018 at 1:20 PM, Karthikeyan Ramasubramanian
<[email protected]> wrote:
> This bus driver supports the GENI based i2c hardware controller in the
> Qualcomm SOCs. The Qualcomm Generic Interface (GENI) is a programmable
> module supporting a wide range of serial interfaces including I2C. The
> driver supports FIFO mode and DMA mode of transfer and switches modes
> dynamically depending on the size of the transfer.
>
> Signed-off-by: Karthikeyan Ramasubramanian <[email protected]>
> Signed-off-by: Sagar Dharia <[email protected]>
> Signed-off-by: Girish Mahadevan <[email protected]>
> ---
> drivers/i2c/busses/Kconfig | 13 +
> drivers/i2c/busses/Makefile | 1 +
> drivers/i2c/busses/i2c-qcom-geni.c | 650
> +++++++++++++++++++++++++++++++++++++
> 3 files changed, 664 insertions(+)
[...]
> +/*
> + * Hardware uses the underlying formula to calculate time periods of
> + * SCL clock cycle. Firmware uses some additional cycles excluded from the
> + * below formula and it is confirmed that the time periods are within
> + * specification limits.
I was hoping for more than just "oh, and there's a fudge factor", but
I guess this is the best I'm going to get?
> +static int geni_i2c_probe(struct platform_device *pdev)
> +{
> + struct geni_i2c_dev *gi2c;
> + struct resource *res;
> + u32 proto, tx_depth;
> + int ret;
> +
> + gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL);
> + if (!gi2c)
> + return -ENOMEM;
> +
> + gi2c->se.dev = &pdev->dev;
> + gi2c->se.wrapper = dev_get_drvdata(pdev->dev.parent);
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + gi2c->se.base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(gi2c->se.base))
> + return PTR_ERR(gi2c->se.base);
> +
> + gi2c->se.clk = devm_clk_get(&pdev->dev, "se");
> + if (IS_ERR(gi2c->se.clk)) {
> + ret = PTR_ERR(gi2c->se.clk);
> + dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
> + return ret;
> + }
> +
> + ret = device_property_read_u32(&pdev->dev, "clock-frequency",
> + &gi2c->clk_freq_out);
> + if (ret) {
> + /* Clock frequency not specified, so default to 100kHz. */
> + dev_info(&pdev->dev,
> + "Bus frequency not specified, default to 100kHz.\n");
If you happen to spin again, can you remove the comment since it's
obvious from the string in the print? It looks a lot like this code:
/* Print hello, world */
printf("hello, world\n");
In any case, that's a pretty minor nit, so I'll add:
Reviewed-by: Douglas Anderson <[email protected]>
...assuming that the bindings and "geni" code get Acked / landed
somewhere. Ideally let's not land this before the geni code lands
since if the geni API changes for some reason it'll cause us grief.
-Doug
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