linux-kernel - Re: [PATCH v12 6/9] mmc: cavium: Add MMC PCI driver for ThunderX SOCs

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Date:   Thu, 23 Mar 2017 10:41:23 -0700
From:   David Daney <ddaney@...iumnetworks.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Jan Glauber <jan.glauber@...iumnetworks.com>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Daney <ddaney@...iumnetworks.com>,
        "Steven J . Hill" <Steven.Hill@...ium.com>
Subject: Re: [PATCH v12 6/9] mmc: cavium: Add MMC PCI driver for ThunderX SOCs

On 03/23/2017 02:28 AM, Ulf Hansson wrote:
> On 23 March 2017 at 09:58, Jan Glauber <jan.glauber@...iumnetworks.com> wrote:
>> On Fri, Mar 17, 2017 at 03:58:26PM +0100, Ulf Hansson wrote:
>>> On 10 March 2017 at 14:25, Jan Glauber <jglauber@...ium.com> wrote:
>>>> Add a platform driver for ThunderX ARM SOCs.
>>>>
>>>> Signed-off-by: Jan Glauber <jglauber@...ium.com>
>>>> ---
>>>>  drivers/mmc/host/Kconfig               |  10 ++
>>>>  drivers/mmc/host/Makefile              |   2 +
>>>>  drivers/mmc/host/cavium-mmc.h          |  10 +-
>>>>  drivers/mmc/host/cavium-pci-thunderx.c | 198 +++++++++++++++++++++++++++++++++
>>>>  4 files changed, 218 insertions(+), 2 deletions(-)
>>>>  create mode 100644 drivers/mmc/host/cavium-pci-thunderx.c
>>>>
>>>> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
>>>> index 68cc811..3983dee 100644
>>>> --- a/drivers/mmc/host/Kconfig
>>>> +++ b/drivers/mmc/host/Kconfig
>>>> @@ -632,6 +632,16 @@ config MMC_CAVIUM_OCTEON
>>>>
>>>>           If unsure, say N.
>>>>
>>>> +config MMC_CAVIUM_THUNDERX
>>>> +       tristate "Cavium ThunderX SD/MMC Card Interface support"
>>>> +       depends on PCI && 64BIT && (ARM64 || COMPILE_TEST)
>>>> +       select GPIO_THUNDERX
>>>
>>> Do you really need to select GPIO_THUNDERX? What is the relationship?
>>
>> I don't know much about gpio, but in the end despite all these layers
>> there must be a gpio set function called doing the writeq on our SOC
>> to enable/disable the power gpio, right?
>>
>> GPIO_THUNDERX implements this gpio set function for Cavium's SOC.
>
> Got it. However using "select" should be avoided.
>
> Please use "depends on GPIOLIB" instead. The select of "GPIO_THUNDERX"
> should be done part of the defconfig or via an SoC specifc Kconfig
> file.
>

Thanks, I think that is the cleanest approach.

We may want to add an MSI-X dependency as well, as legacy interrupts are 
not supported by the hardware.

David.