Re: [PATCH] ARM64: Kconfig: Fix the missing hi655x common clk
From: Daniel Lezcano
Date: Fri Feb 16 2018 - 12:36:01 EST
On 12/06/2017 23:12, Arnd Bergmann wrote:
> On Mon, Jun 12, 2017 at 11:38 AM, Daniel Lezcano
> <daniel.lezcano@xxxxxxxxxx> wrote:
>> On Fri, Jun 09, 2017 at 10:48:13PM +0200, Arnd Bergmann wrote:
>>> On Fri, Jun 9, 2017 at 10:15 PM, John Stultz <john.stultz@xxxxxxxxxx> wrote:
>>>> On Fri, Jun 9, 2017 at 1:06 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>>>>> On Fri, Jun 9, 2017 at 5:46 PM, Daniel Lezcano
>>>>> <daniel.lezcano@xxxxxxxxxx> wrote:
>>>>>
>>>>> Yes, but I'm not sure this is the right patch either. We tend to not
>>>>> use 'select' for user-visible drivers, and most hisilicon platforms
>>>>> won't need this driver.
>>>>>
>>>>> I think it would be more consistent to add this to the defconfig
>>>>> and regard it as a user error when the driver is disabled on a
>>>>> machine that needs it.
>>>>
>>>> Maybe the select is not exactly in the right place, but I don't really
>>>> feel like a pmic on an SoC is a "user-visible driver". I deal with the
>>>> board often and when the new dependency was made on the clk, I would
>>>> have never have found it on my own w/o Ulf and Daniel pointing out
>>>> what I needed to enable.
>>>
>>> What I meant is that the Kconfig option is user-visible. On a very high
>>> level, this is a result of arch/arm64/Kconfig.platforms listing only
>>> very broad categories of SoCs, in many cases only the manufacturers
>>> of very different chip families, which then control the visibility of the
>>> individual Kconfig items for things like pinctrl or clk.
>>>
>>> I now see that MFD_HI655X_PMIC is the top-level driver that you
>>> have to select before enabling COMMON_CLK_HI655X, so the
>>> patch is actually broken unless it actually selects both.
>>>
>>> How about simply adding a 'default MFD_HI655X_PMIC' to
>>> COMMON_CLK_HI655X to enable it unless it is explicitly
>>> turned off?
>>
>> Actually, I share John's opinion.
>>
>> Ideally when we choose a platform, all the relevants devices configuration
>> options should be selected automatically from a single topmost node of a tree
>> (platform selection) to all the nodes corresponding to the devices, leaving the
>> user to select one simple option without knowledge of the SoC hardware
>> internals.
>>
>> If the user is expert in the platform and knows exactly what he does, then he
>> can select an _EXPERT_ like option and be able to disable some drivers.
>>
>> It is how I tend to write the Kconfig options, so the 'default MFD_HI655X_PMIC'
>> is confusing for me. Wouldn't make sense to select COMMON_CLK_HI655X when
>> MFD_HI655X_PMIC is enabled?
>
> I don't think it's that easy. When you do that, MFD_HI655X_PMIC gains
> a dependency on COMMON_CLK and will again cause a warning on
> machines that disable that during compile testing.
>
> Using 'select' for user-selectable options generally leads to problems,
> and you are better off avoiding it. If you want to make the symbol impossible
> to turn off for non-EXPERT configurations, you can write it like
>
> config COMMON_CLK_HI655X
> tristate "Clock driver for Hi655x" if EXPERT
> depends on (MFD_HI655X_PMIC || COMPILE_TEST)
> depends on REGMAP
> default MFD_HI655X_PMIC
>
> That way the option is completely hidden for non-EXPERT,
> but still has the right default otherwise, and the dependencies
> are tracked right for compile-testing.
What about the options:
CONFIG_HI3660_MBOX
CONFIG_HI6220_MBOX
CONFIG_STUB_CLK_HI6220
CONFIG_STUB_CLK_HI3660
?
Would make sense to do something like:
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index b9546ab..3a07dfe 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -517,7 +517,6 @@ CONFIG_COMMON_CLK_CS2000_CP=y
CONFIG_COMMON_CLK_S2MPS11=y
CONFIG_CLK_QORIQ=y
CONFIG_COMMON_CLK_PWM=y
-CONFIG_STUB_CLK_HI3660=y
CONFIG_COMMON_CLK_QCOM=y
CONFIG_QCOM_CLK_SMD_RPM=y
CONFIG_IPQ_GCC_8074=y
@@ -529,8 +528,6 @@ CONFIG_HWSPINLOCK_QCOM=y
CONFIG_ARM_MHU=y
CONFIG_PLATFORM_MHU=y
CONFIG_BCM2835_MBOX=y
-CONFIG_HI3660_MBOX=y
-CONFIG_HI6220_MBOX=y
CONFIG_ROCKCHIP_IOMMU=y
CONFIG_ARM_SMMU=y
CONFIG_ARM_SMMU_V3=y
diff --git a/drivers/clk/hisilicon/Kconfig b/drivers/clk/hisilicon/Kconfig
index 1bd4355..becdb1d 100644
--- a/drivers/clk/hisilicon/Kconfig
+++ b/drivers/clk/hisilicon/Kconfig
@@ -44,14 +44,17 @@ config RESET_HISI
Build reset controller driver for HiSilicon device chipsets.
config STUB_CLK_HI6220
- bool "Hi6220 Stub Clock Driver"
- depends on COMMON_CLK_HI6220 && MAILBOX
- default ARCH_HISI
+ bool "Hi6220 Stub Clock Driver" if EXPERT
+ depends on (COMMON_CLK_HI6220 || COMPILE_TEST)
+ depends on MAILBOX
+ default COMMON_CLK_HI6220
help
Build the Hisilicon Hi6220 stub clock driver.
config STUB_CLK_HI3660
- bool "Hi3660 Stub Clock Driver"
- depends on COMMON_CLK_HI3660 && MAILBOX
+ bool "Hi3660 Stub Clock Driver" if EXPERT
+ depends on (COMMON_CLK_HI3660 || COMPILE_TEST)
+ depends on MAILBOX
+ default COMMON_CLK_HI3660
help
Build the Hisilicon Hi3660 stub clock driver.
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index de8390d4..8d1726c 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -109,16 +109,19 @@ config TI_MESSAGE_MANAGER
platform has support for the hardware block.
config HI3660_MBOX
- tristate "Hi3660 Mailbox"
- depends on ARCH_HISI && OF
+ tristate "Hi3660 Mailbox" if EXPERT
+ depends on (ARCH_HISI || COMPILE_TEST)
+ depends on OF
+ default ARCH_HISI
help
An implementation of the hi3660 mailbox. It is used to send message
between application processors and other processors/MCU/DSP. Select
Y here if you want to use Hi3660 mailbox controller.
config HI6220_MBOX
- tristate "Hi6220 Mailbox"
- depends on ARCH_HISI
+ tristate "Hi6220 Mailbox" if EXPERT
+ depends on (ARCH_HISI || COMPILE_TEST)
+ default ARCH_HISI
help
An implementation of the hi6220 mailbox. It is used to send message
between application processors and MCU. Say Y here if you want to
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