Re: [PATCH 1/2] mfd: pm8x41: add support for Qualcomm 8x41 PMICs

[Ivan T. Ivanov]

Hi,

On Tue, 2014-04-22 at 17:31 -0700, Courtney Cavin wrote:
> From: Josh Cartwright <jo...@codeaurora.org>
> 
> 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 <jo...@codeaurora.org>
> Signed-off-by: Courtney Cavin <courtney.ca...@sonymobile.com>
> ---
>  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'

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 {
                compatible = "qcom,pm8941";
                reg = <0x4 SPMI_USID>;

                #address-cells = <1>;
                #size-cells = <0>;

                revid@100 {
                        compatible = "qcom,qpnp-revid";
                        reg = <0x100 0x100>;
                };
        };
};

Any suggestions?

Thanks, 
Ivan

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