Op 24 jan. 2013, om 04:45 heeft "Patil, Rachna" <rac...@ti.com> het volgende
geschreven:
> From: "Patil, Rachna" <rac...@ti.com>
>
> Make changes to add DT support in the MFD core driver.
>
> Signed-off-by: Patil, Rachna <rac...@ti.com>
> ---
> Changes in v4:
> Non-standard properties prefixed with vendor name.
>
> drivers/mfd/ti_am335x_tscadc.c | 28 +++++++++++++++++++++++-----
> 1 file changed, 23 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index e9f3fb5..87b446b 100644
> --- a/drivers/mfd/ti_am335x_tscadc.c
> +++ b/drivers/mfd/ti_am335x_tscadc.c
> @@ -22,6 +22,8 @@
> #include <linux/regmap.h>
> #include <linux/mfd/core.h>
> #include <linux/pm_runtime.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
> #include <linux/mfd/ti_am335x_tscadc.h>
> #include <linux/input/ti_am335x_tsc.h>
> @@ -64,20 +66,31 @@ static int ti_tscadc_probe(struct platform_device
> *pdev)
> struct resource *res;
> struct clk *clk;
> struct mfd_tscadc_board *pdata = pdev->dev.platform_data;
> + struct device_node *node = pdev->dev.of_node;
> struct mfd_cell *cell;
> int err, ctrl;
> int clk_value, clock_rate;
> - int tsc_wires, adc_channels = 0, total_channels;
> + int tsc_wires = 0, adc_channels = 0, total_channels;
>
> - if (!pdata) {
> + if (!pdata && !pdev->dev.of_node) {
> dev_err(&pdev->dev, "Could not find platform data\n");
> return -EINVAL;
> }
>
> - if (pdata->adc_init)
> - adc_channels = pdata->adc_init->adc_channels;
> + if (pdev->dev.platform_data) {
> + if (pdata->tsc_init)
> + tsc_wires = pdata->tsc_init->wires;
> +
> + if (pdata->adc_init)
> + adc_channels = pdata->adc_init->adc_channels;
> + } else {
> + node = of_find_node_by_name(pdev->dev.of_node, "tsc");
> + of_property_read_u32(node, "ti,wires", &tsc_wires);
> +
> + node = of_find_node_by_name(pdev->dev.of_node, "adc");
> + of_property_read_u32(node, "ti,adc-channels", &adc_channels);
> + }
Since AM335x is DT only, why is there a platform data codepath and why is it
the first branch it tries? And I guess the next question is related to the
first: why doesn't it work when used with DT? When I copy over the nodes from
the evm.dts to my board I get "tsc tsc: Missing platform data" in dmesg.
What are the chances this driver will work when applied on top of 3.8-rcX? Has
it even been tested with that? Has it been tested at all?
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