On 4/23/2014 6:19 AM, Ivan T. Ivanov wrote:
>
> Hi,
>
> On Tue, 2014-04-22 at 17:31 -0700, Courtney Cavin wrote:
>> From: Josh Cartwright <joshc@xxxxxxxxxxxxxx>
>>
>> The Qualcomm 8941 and 8841 PMICs are components used with the Snapdragon
>> 800 series SoC family. This driver exists largely as a glue mfd component,
>> it exists to be an owner of an SPMI regmap for children devices
>> described in device tree.
>>
>
> Thanks. This is exactly what I have planed to do :-)
>
>> Signed-off-by: Josh Cartwright <joshc@xxxxxxxxxxxxxx>
>> Signed-off-by: Courtney Cavin <courtney.cavin@xxxxxxxxxxxxxx>
>> ---
>> drivers/mfd/Kconfig | 13 +++++++++++
>> drivers/mfd/Makefile | 1 +
>> drivers/mfd/pm8x41.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 77 insertions(+)
>> create mode 100644 drivers/mfd/pm8x41.c
>>
>
> <snip>
>
>> +
>> +static int pm8x41_probe(struct spmi_device *sdev)
>> +{
>> + struct regmap *regmap;
>> +
>> + regmap = devm_regmap_init_spmi_ext(sdev, &pm8x41_regmap_config);
>> + if (IS_ERR(regmap)) {
>> + dev_dbg(&sdev->dev, "regmap creation failed.\n");
>> + return PTR_ERR(regmap);
>> + }
>> +
>> + return of_platform_populate(sdev->dev.of_node, NULL, NULL, &sdev->dev);
>
> I think that this will not going to work. For example in this particular
> case, both controllers have "qcom,qpnp-revid" peripheral which is
> located at offset 0x100.
>
> And the result is:
>
> [ 0.963944] sysfs: cannot create duplicate filename '/bus/platform/devices/100.revid'
The duplicate filename error is because pm8x41_probe() is calling of_platform_populate()
directly.
If that call is removed then there is no attempt to create a revid file in
/sys/bus/platform/devices. If I add your pm8841@4 node to my dts file, then
the 100.revid file is properly created at
/sys/firmware/devicetree/base/soc/qcom,spmi@fc4cf000/pm8841@4/qcom,revid@100
and no attempt is made to create /sys/bus/platform/devices/100.revid
This appears to be correct to me, because I do not think revid should be created as
a platform device.
>
> DT looks like this:
>
> spmi {
> compatible = "qcom,spmi-pmic-arb";
> reg-names = "core", "intr", "cnfg";
> reg = <0xfc4cf000 0x1000>,
> <0xfc4cb000 0x1000>,
> <0xfc4ca000 0x1000>;
>
> interrupt-names = "periph_irq";
> interrupts = <0 190 0>;
>
> qcom,ee = <0>;
> qcom,channel = <0>;
>
> #address-cells = <2>;
> #size-cells = <0>;
>
> interrupt-controller;
> #interrupt-cells = <4>;
>
> pm8941@0 {
> compatible = "qcom,pm8941";
> reg = <0x0 SPMI_USID>;
>
> #address-cells = <1>;
> #size-cells = <0>;
>
> revid@100 {
> compatible = "qcom,qpnp-revid";
> reg = <0x100 0x100>;
> };
> };
>
> pm8841@4 {
^^^^^^^^ typo nit - that should be pm8941@4.
The nit does not change what you reported though.
> compatible = "qcom,pm8941";
> reg = <0x4 SPMI_USID>;
>
> #address-cells = <1>;
> #size-cells = <0>;
>
> revid@100 {
> compatible = "qcom,qpnp-revid";
> reg = <0x100 0x100>;
> };
> };
> };
>
> Any suggestions?
Remove of_platform_populate() from pm8x41_probe(). Do you know of any
other reason it can not be removed?
-Frank
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