linux-kernel - Re: [PATCH 2/5] pinctrl: meson: Add support to set direction with a secure monitor call

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Message-ID: <ff6d516d-5d3b-c80f-941b-fed41a3a9ead@baylibre.com>
Date:   Fri, 3 Aug 2018 10:10:09 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        jbrunet@...libre.com
Cc:     khilman@...libre.com, linus.walleij@...aro.org,
        linux-amlogic@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/5] pinctrl: meson: Add support to set direction with a
 secure monitor call

On 02/08/2018 22:42, Martin Blumenstingl wrote:
> On Thu, Aug 2, 2018 at 1:21 PM Jerome Brunet <jbrunet@...libre.com> wrote:
>>
>> On Thu, 2018-08-02 at 09:52 +0200, Neil Armstrong wrote:
>>> On 01/08/2018 22:23, Martin Blumenstingl wrote:
>>>> Hi Neil,
>>>>
>>>> On Wed, Aug 1, 2018 at 12:05 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>>>>
>>>>> The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
>>>>> set the TEST_N pin direction.
>>>>> This patch adds a "smc" boolean to the bank structure to differentiate
>>>>> the TEST_N bank and call the Secure Monitor in the _input/_output functions.
>>>>>
>>>>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>>>>> ---
>>>>>  drivers/pinctrl/meson/Kconfig         |  1 +
>>>>>  drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
>>>>>  drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
>>>>>  3 files changed, 36 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
>>>>> index c80951d..1b90470 100644
>>>>> --- a/drivers/pinctrl/meson/Kconfig
>>>>> +++ b/drivers/pinctrl/meson/Kconfig
>>>>> @@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
>>>>>         select GPIOLIB
>>>>>         select OF_GPIO
>>>>>         select REGMAP_MMIO
>>>>> +       select MESON_SM
>>>>
>>>> I wonder why PINCTRL_MESON has to select MESON_SM - shouldn't
>>>> PINCTRL_MESON_GXBB, PINCTRL_MESON_GXL and PINCTRL_MESON_AXG select it
>>>> instead?
>>>> selecting MESON_SM is probably no-op on Meson8 and Meson8b (which
>>>> don't have the GX secure monitor), but I haven't tested it yet
>>
>> I'm not so sure about that. meson_sm_call() symbol is used in the common pinctrl
>> code, so it should be selected when compiled even if meson8b is not going to use
>> it in the end.
> unfortunately MESON_SM depends on ARM64_4K_PAGES so it can't be
> enabled for the 32-bit SoCs
> any ideas how to solve this?

I think I'll need to wrap the meson_sm calls around a
#if IS_ENABLED(MESON_SM)

and
select MESON_SM if ARM64

in Kconfig

> 
> 
> Regards
> Martin
>