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Date: Mon, 17 Feb 2020 12:51:52 +0530 From: "Dwivedi, Avaneesh Kumar (avani)" <akdwived@...eaurora.org> To: Greg KH <greg@...ah.com> Cc: linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, ckadabi@...eaurora.org, tsoni@...eaurora.org, bryanh@...eaurora.org, psodagud@...eaurora.org, rnayak@...eaurora.org, satyap@...eaurora.org, pheragu@...eaurora.org Subject: Re: [PATCH v4 2/2] Embedded USB Debugger (EUD) driver On 2/16/2020 10:05 PM, Greg KH wrote: > On Sun, Feb 16, 2020 at 09:52:19PM +0530, Dwivedi, Avaneesh Kumar (avani) wrote: >> On 2/7/2020 3:34 PM, Greg KH wrote: >>> On Fri, Jan 31, 2020 at 10:13:31AM +0530, Avaneesh Kumar Dwivedi wrote: >>>> Add support for control peripheral of EUD (Embedded USB Debugger) to >>>> listen to events such as USB attach/detach, charger enable/disable, pet >>>> EUD to indicate software is functional. Reusing the platform device kobj, >>>> sysfs entry 'enable' is created to enable or disable EUD. >>>> >>>> Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@...eaurora.org> >>>> Signed-off-by: Prakruthi Deepak Heragu <pheragu@...eaurora.org> >>>> Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@...eaurora.org> >>>> --- >>>> Documentation/ABI/stable/sysfs-driver-msm-eud | 5 + >>>> drivers/soc/qcom/Kconfig | 12 + >>>> drivers/soc/qcom/Makefile | 1 + >>>> drivers/soc/qcom/eud.c | 329 ++++++++++++++++++++++++++ >>>> 4 files changed, 347 insertions(+) >>>> create mode 100644 Documentation/ABI/stable/sysfs-driver-msm-eud >>>> create mode 100644 drivers/soc/qcom/eud.c >>>> >>>> diff --git a/Documentation/ABI/stable/sysfs-driver-msm-eud b/Documentation/ABI/stable/sysfs-driver-msm-eud >>>> new file mode 100644 >>>> index 0000000..d96ae05 >>>> --- /dev/null >>>> +++ b/Documentation/ABI/stable/sysfs-driver-msm-eud >>>> @@ -0,0 +1,5 @@ >>>> +What: /sys/bus/platform/drivers/msm-eud/enable >>>> +Date: Jan 2020 >>>> +Contact: Avaneesh Kumar Dwivedi <akdwived@...eaurora.org> >>>> +Description: Enable/Disable use of eud device. >>> What are valid values to be used here? >> it should be bool variable relying on 0 or 1. > Then document it. OK > >>>> +Users: User space debug application which intend to use EUD h/w block. >>>> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig >>>> index d0a73e7..6b7c9d0 100644 >>>> --- a/drivers/soc/qcom/Kconfig >>>> +++ b/drivers/soc/qcom/Kconfig >>>> @@ -202,4 +202,16 @@ config QCOM_APR >>>> application processor and QDSP6. APR is >>>> used by audio driver to configure QDSP6 >>>> ASM, ADM and AFE modules. >>>> + >>>> +config QCOM_EUD >>>> + tristate "QTI Embedded USB Debugger (EUD)" >>>> + depends on ARCH_QCOM >>> Why not let everyone test build this? >> EUD is Qualcomm IP, shall not it be associated with ARCH_QCOM? > No, why can't everyone buid it for testing? What about when I want to > build a generic arm64 kernel to run on multiple SoCs? > > Do not put dependancies in here that you really do not have. There's no > reason for this to be limited to that one chip, right? And if you allow > others to build the code, you will get proper bug reports when things > break, and others will fix them, which is what you want. > > I think the ARCH_RANDOM_SOC_NAME is totally broken and needs to be, at > most, just an arch-specific thing, if even that. > > Look at almost all other kernel drivers, they do not have those types of > dependancies. Will check and address concerns. > >>>> + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); >>>> + if (!chip) >>>> + return -ENOMEM; >>>> + >>>> + chip->dev = &pdev->dev; >>> No reference counting??? >> you mean get/put_device? > yes. > > thanks, > > greg k-h Thank you very much Greg for your time to review. -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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