linux-kernel - Re: [PATCH 1/7] usb: typec: ucsi: add PMIC Glink UCSI driver

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Date:   Fri, 10 Feb 2023 11:44:22 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/7] usb: typec: ucsi: add PMIC Glink UCSI driver

On 10/02/2023 11:38, Greg Kroah-Hartman wrote:
> On Fri, Feb 10, 2023 at 11:31:08AM +0100, Neil Armstrong wrote:
>> On 31/01/2023 10:16, Greg Kroah-Hartman wrote:
>>> On Mon, Jan 30, 2023 at 10:54:32AM +0100, Neil Armstrong wrote:
>>>> Introduce the UCSI PMIC Glink aux driver that communicates
>>>> with the aDSP firmware with the UCSI protocol which handles
>>>> the USB-C Port(s) Power Delivery.
>>>>
>>>> The UCSI messaging is necessary on newer Qualcomm SoCs to
>>>> provide USB role switch and altmode notifications.
>>>>
>>>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>>>> ---
>>>>    drivers/usb/typec/ucsi/Kconfig      |   7 +
>>>>    drivers/usb/typec/ucsi/Makefile     |   1 +
>>>>    drivers/usb/typec/ucsi/ucsi_glink.c | 321 ++++++++++++++++++++++++++++++++++++
>>>>    3 files changed, 329 insertions(+)
>>>>
>>>> diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig
>>>> index 8f9c4b9f31f7..dee6069e46a2 100644
>>>> --- a/drivers/usb/typec/ucsi/Kconfig
>>>> +++ b/drivers/usb/typec/ucsi/Kconfig
>>>> @@ -58,4 +58,11 @@ config UCSI_STM32G0
>>>>    	  To compile the driver as a module, choose M here: the module will be
>>>>    	  called ucsi_stm32g0.
>>>> +config UCSI_PMIC_GLINK
>>>> +	tristate "UCSI Qualcomm PMIC GLINK Interface Driver"
>>>> +	depends on QCOM_PMIC_GLINK
>>>
>>> No way to test build this code without this option?
>>
>> Nop, the QCOM_PMIC_GLINK is a build dependency, this can't be removed
> 
> Then perhaps the QCOM_PMIC_GLINK code needs to be fixed up to allow for
> it to be built on all platforms properly?  Otherwise you are
> guaranteeing you will not get much, if any, build coverage and api
> changes will cause this code to stagnate over time :(

The QCOM_PMIC_GLINK deps are:
         depends on RPMSG
         depends on TYPEC
         depends on DRM
         depends on NET
         depends on OF
         select AUXILIARY_BUS
         select QCOM_PDR_HELPERS

What would be the changes needed here ?

Neil

> 
> thanks,
> 
> greg k-h