linux-kernel - Re: [PATCH v2 2/2] pinctrl: qcom: sc7280: Add lpi pinctrl variant data for adsp based targets

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Message-ID: <a2b7de25-55a4-7d31-2787-be6d0ccf9500@quicinc.com>
Date:   Fri, 3 Jun 2022 16:33:12 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     <agross@...nel.org>, <bjorn.andersson@...aro.org>,
        <lgirdwood@...il.com>, <broonie@...nel.org>, <robh+dt@...nel.org>,
        <quic_plai@...cinc.com>, <bgoswami@...cinc.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <srinivas.kandagatla@...aro.org>,
        <quic_rohkumar@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <swboyd@...omium.org>,
        <judyhsiao@...omium.org>, <linux-gpio@...r.kernel.org>,
        Venkata Prasad Potturu <quic_potturu@...cinc.com>
Subject: Re: [PATCH v2 2/2] pinctrl: qcom: sc7280: Add lpi pinctrl variant
 data for adsp based targets


On 6/3/2022 3:58 PM, Linus Walleij wrote:
Thanks for Your time and valuable inputs Linus!!!
> On Wed, Jun 1, 2022 at 12:30 PM Srinivasa Rao Mandadapu
> <quic_srivasam@...cinc.com> wrote:
>
> So one way to just use a propert and avoid more compatible strings:
>
>> Add compatible string and lpi pinctrl variant data structure for adsp
>> enabled sc7280 platforms.
>> This variant data structure rnd compatible name required for
>> distingushing ADSP based platforms and ADSP bypass platforms.
>> In case of ADSP enabled platforms, where audio is routed through ADSP
>> macro and decodec GDSC Switches are triggered as clocks by pinctrl
>> driver and ADSP firmware controls them. So It's mandatory to enable
>> them in ADSP based solutions.
>> In case of ADSP bypass platforms clock voting is optional as these macro
>> and dcodec GDSC switches are maintained as power domains and operated from
>> lpass clock drivers.
>>
>> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
>> Co-developed-by: Venkata Prasad Potturu <quic_potturu@...cinc.com>
>> Signed-off-by: Venkata Prasad Potturu <quic_potturu@...cinc.com>
>> ---
>>   drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c | 14 ++++++++++++++
>>   1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
>> index 2add9a4..c9e85d9 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
>> @@ -134,6 +134,16 @@ static const struct lpi_function sc7280_functions[] = {
>>          LPI_FUNCTION(wsa_swr_data),
>>   };
>>
>> +static const struct lpi_pinctrl_variant_data sc7280_adsp_lpi_data = {
> Remove static and export this struct in drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
We can remove entire data structure if my below approach is okay.
>
>> +       .pins = sc7280_lpi_pins,
>> +       .npins = ARRAY_SIZE(sc7280_lpi_pins),
>> +       .groups = sc7280_groups,
>> +       .ngroups = ARRAY_SIZE(sc7280_groups),
>> +       .functions = sc7280_functions,
>> +       .nfunctions = ARRAY_SIZE(sc7280_functions),
>> +       .is_clk_optional = false,
>> +};
>>
>>
>>   static const struct lpi_pinctrl_variant_data sc7280_lpi_data = {
>>          .pins = sc7280_lpi_pins,
>>          .npins = ARRAY_SIZE(sc7280_lpi_pins),
>> @@ -149,6 +159,10 @@ static const struct of_device_id lpi_pinctrl_of_match[] = {
>>                 .compatible = "qcom,sc7280-lpass-lpi-pinctrl",
>>                 .data = &sc7280_lpi_data,
>>          },
>> +       {
>> +               .compatible = "qcom,sc7280-lpass-adsp-lpi-pinctrl",
>> +               .data = &sc7280_adsp_lpi_data,
>> +       },
> Drop this and instead add some code in the probe()
> in drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
> lines:
>
> if (of_device_is_compatible(np, "qcom,sc7280-lpass-lpi-pinctrl") &&
> of_property_read_bool(np, "qcom,adsp-mode))
>       data = &sc7280_adsp_lpi_data;

Here, only diff between ADSP and ADSP bypass variant dats is 
"is_clk_optional" field.

So we can keep something like this. Kindly suggest, if it's not making 
sense.

if (of_device_is_compatible(np, "qcom,sc7280-lpass-lpi-pinctrl") &&
of_property_read_bool(np, "qcom,adsp-mode))
      data->is_clk_optional = false;

>
> Yours,
> Linus Walleij