[PATCH 1/1] irqchip: Add config MTK_SYSIRQ and MTK_CIRQ

[PATCH 1/1] irqchip: Add config MTK_SYSIRQ and MTK_CIRQ

[Hanks Chen]

Mediatek sysirq and cirq drivers as-is were bound together to the config
of ARCH_MEDIATEK.  These two drivers should be able to be configured
separately.  For example, on new Mediatek mobile chips such as Dimensity
820, the sysirq driver is not used since the hardware module is removed.

Add two new configs to sysirq and cirq drivers.
- config MTK_SYSIRQ for the interrupt polarity controller driver: sysirq
- config MTK_CIRQ for the low-power interrupt driver: cirq

Signed-off-by: cc.hwang <cc.hwang@mediatek.com>
Signed-off-by: Hanks Chen <hanks.chen@mediatek.com>
---
 drivers/irqchip/Kconfig  |   12 ++++++++++++
 drivers/irqchip/Makefile |    3 ++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 29fead2..cc9aa18 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -572,4 +572,16 @@ config LOONGSON_PCH_MSI
 	help
 	  Support for the Loongson PCH MSI Controller.
 
+config MTK_SYSIRQ
+	tristate "Mediatek interrupt polarity controller"
+	help
+	  Interrupt polarity controller driver to swap polarity for
+	  interrupts for Mediatek mobile chips.
+
+config MTK_CIRQ
+	bool "Mediatek low-power interrupt controller"
+	help
+	  Low-power interrupt controller driver to monitor IRQS
+	  in the sleep mode for Mediatek mobile chips.
+
 endmenu
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 133f9c4..30421d2 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -69,7 +69,8 @@ obj-$(CONFIG_BCM7120_L2_IRQ)		+= irq-bcm7120-l2.o
 obj-$(CONFIG_BRCMSTB_L2_IRQ)		+= irq-brcmstb-l2.o
 obj-$(CONFIG_KEYSTONE_IRQ)		+= irq-keystone.o
 obj-$(CONFIG_MIPS_GIC)			+= irq-mips-gic.o
-obj-$(CONFIG_ARCH_MEDIATEK)		+= irq-mtk-sysirq.o irq-mtk-cirq.o
+obj-$(CONFIG_MTK_SYSIRQ)		+= irq-mtk-sysirq.o
+obj-$(CONFIG_MTK_CIRQ)			+= irq-mtk-cirq.o
 obj-$(CONFIG_ARCH_DIGICOLOR)		+= irq-digicolor.o
 obj-$(CONFIG_RENESAS_H8300H_INTC)	+= irq-renesas-h8300h.o
 obj-$(CONFIG_RENESAS_H8S_INTC)		+= irq-renesas-h8s.o
-- 
1.7.9.5
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Re: [PATCH 1/1] irqchip: Add config MTK_SYSIRQ and MTK_CIRQ

[Marc Zyngier]

On 2020-06-18 13:31, Hanks Chen wrote:
> Mediatek sysirq and cirq drivers as-is were bound together to the 
> config
> of ARCH_MEDIATEK.  These two drivers should be able to be configured
> separately.  For example, on new Mediatek mobile chips such as 
> Dimensity
> 820, the sysirq driver is not used since the hardware module is 
> removed.
> 
> Add two new configs to sysirq and cirq drivers.
> - config MTK_SYSIRQ for the interrupt polarity controller driver: 
> sysirq
> - config MTK_CIRQ for the low-power interrupt driver: cirq
> 
> Signed-off-by: cc.hwang <cc.hwang@mediatek.com>
> Signed-off-by: Hanks Chen <hanks.chen@mediatek.com>
> ---
>  drivers/irqchip/Kconfig  |   12 ++++++++++++
>  drivers/irqchip/Makefile |    3 ++-
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 29fead2..cc9aa18 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -572,4 +572,16 @@ config LOONGSON_PCH_MSI
>  	help
>  	  Support for the Loongson PCH MSI Controller.
> 
> +config MTK_SYSIRQ
> +	tristate "Mediatek interrupt polarity controller"

How do you expect this to work as a module?

> +	help
> +	  Interrupt polarity controller driver to swap polarity for
> +	  interrupts for Mediatek mobile chips.
> +
> +config MTK_CIRQ
> +	bool "Mediatek low-power interrupt controller"
> +	help
> +	  Low-power interrupt controller driver to monitor IRQS
> +	  in the sleep mode for Mediatek mobile chips.
> +
>  endmenu
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 133f9c4..30421d2 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -69,7 +69,8 @@ obj-$(CONFIG_BCM7120_L2_IRQ)		+= irq-bcm7120-l2.o
>  obj-$(CONFIG_BRCMSTB_L2_IRQ)		+= irq-brcmstb-l2.o
>  obj-$(CONFIG_KEYSTONE_IRQ)		+= irq-keystone.o
>  obj-$(CONFIG_MIPS_GIC)			+= irq-mips-gic.o
> -obj-$(CONFIG_ARCH_MEDIATEK)		+= irq-mtk-sysirq.o irq-mtk-cirq.o
> +obj-$(CONFIG_MTK_SYSIRQ)		+= irq-mtk-sysirq.o
> +obj-$(CONFIG_MTK_CIRQ)			+= irq-mtk-cirq.o
>  obj-$(CONFIG_ARCH_DIGICOLOR)		+= irq-digicolor.o
>  obj-$(CONFIG_RENESAS_H8300H_INTC)	+= irq-renesas-h8300h.o
>  obj-$(CONFIG_RENESAS_H8S_INTC)		+= irq-renesas-h8s.o

In general, this approach doesn't look right. As it stands, this is just 
breaking existing configurations

Do you really expect users to know exactly which interrupt controllers 
their system is going to use? This seems like the wrong assumption. If 
you really want to save the handful of bytes these drivers take in your 
image, then add the relevant dependency information in Kconfig.

         M.
-- 
Jazz is not dead. It just smells funny...

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Re: [PATCH 1/1] irqchip: Add config MTK_SYSIRQ and MTK_CIRQ

[Hanks Chen]

On Thu, 2020-06-18 at 13:41 +0100, Marc Zyngier wrote:
> On 2020-06-18 13:31, Hanks Chen wrote:
> > Mediatek sysirq and cirq drivers as-is were bound together to the 
> > config
> > of ARCH_MEDIATEK.  These two drivers should be able to be configured
> > separately.  For example, on new Mediatek mobile chips such as 
> > Dimensity
> > 820, the sysirq driver is not used since the hardware module is 
> > removed.
> > 
> > Add two new configs to sysirq and cirq drivers.
> > - config MTK_SYSIRQ for the interrupt polarity controller driver: 
> > sysirq
> > - config MTK_CIRQ for the low-power interrupt driver: cirq
> > 
> > Signed-off-by: cc.hwang <cc.hwang@mediatek.com>
> > Signed-off-by: Hanks Chen <hanks.chen@mediatek.com>
> > ---
> >  drivers/irqchip/Kconfig  |   12 ++++++++++++
> >  drivers/irqchip/Makefile |    3 ++-
> >  2 files changed, 14 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> > index 29fead2..cc9aa18 100644
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -572,4 +572,16 @@ config LOONGSON_PCH_MSI
> >  	help
> >  	  Support for the Loongson PCH MSI Controller.
> > 
> > +config MTK_SYSIRQ
> > +	tristate "Mediatek interrupt polarity controller"
> 
> How do you expect this to work as a module?

My fault, I missed some patches.I'll add them in next patches.

These should be three patches:
1. break existing configurations and create new config for them
2. Change Kconfig to be loadable as a module and ensure all platforms
are executable.
3. Make the irq-mtk-sysirq driver as a loadable kernel module for GKI
and flexibility.
.
Thank you for your comment

> 
> > +	help
> > +	  Interrupt polarity controller driver to swap polarity for
> > +	  interrupts for Mediatek mobile chips.
> > +
> > +config MTK_CIRQ
> > +	bool "Mediatek low-power interrupt controller"
> > +	help
> > +	  Low-power interrupt controller driver to monitor IRQS
> > +	  in the sleep mode for Mediatek mobile chips.
> > +
> >  endmenu
> > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> > index 133f9c4..30421d2 100644
> > --- a/drivers/irqchip/Makefile
> > +++ b/drivers/irqchip/Makefile
> > @@ -69,7 +69,8 @@ obj-$(CONFIG_BCM7120_L2_IRQ)		+= irq-bcm7120-l2.o
> >  obj-$(CONFIG_BRCMSTB_L2_IRQ)		+= irq-brcmstb-l2.o
> >  obj-$(CONFIG_KEYSTONE_IRQ)		+= irq-keystone.o
> >  obj-$(CONFIG_MIPS_GIC)			+= irq-mips-gic.o
> > -obj-$(CONFIG_ARCH_MEDIATEK)		+= irq-mtk-sysirq.o irq-mtk-cirq.o
> > +obj-$(CONFIG_MTK_SYSIRQ)		+= irq-mtk-sysirq.o
> > +obj-$(CONFIG_MTK_CIRQ)			+= irq-mtk-cirq.o
> >  obj-$(CONFIG_ARCH_DIGICOLOR)		+= irq-digicolor.o
> >  obj-$(CONFIG_RENESAS_H8300H_INTC)	+= irq-renesas-h8300h.o
> >  obj-$(CONFIG_RENESAS_H8S_INTC)		+= irq-renesas-h8s.o
> 
> In general, this approach doesn't look right. As it stands, this is just 
> breaking existing configurations
> 
> Do you really expect users to know exactly which interrupt controllers 
> their system is going to use? This seems like the wrong assumption. If 
> you really want to save the handful of bytes these drivers take in your 
> image, then add the relevant dependency information in Kconfig.
> 

1. This patch will add a dependency on it in Kconfig, which ensures all
platforms are executable.
2. We want to follow the Android GKI and according to the requirement of
GKI(General Kernel Image), all SoC and Board Peripheral drivers are
loadable kernel modules.so I need to breaking existing configurations
and create new config for them.

Thank you for your comment
>          M.

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Re: [PATCH 1/1] irqchip: Add config MTK_SYSIRQ and MTK_CIRQ

[Saravana Kannan]

On Tue, Jun 23, 2020 at 1:37 AM Marc Zyngier <maz@kernel.org> wrote:
>
> + Saravana
>
> On 2020-06-23 07:36, Hanks Chen wrote:
>
> [...]
>
> > Hi Marc,
> >
> > I want to break the dependency between ARCH_MEDIATEK and CIRQ/SYSIRQ,
> > because we need to follow the GKI.
>
> This isn't what GKI mandates. GKI requires that the SoC code is compiled
> as modules, not that it is dissociated from its platform (which would
> be completely pointless).
>
> > Could I add the MTK_CIRQ and MTK_SYSIRQ into defconfig?
> > (arch/arm64/config/defconfig)
>
> I don't deal with defconfig at all. That's a patch for the arm-soc
> people.
>
> >
> > It would ensures all platform are executable.
> >
> > e.g.
> > --- a/arch/arm64/configs/defconfig
> > +++ b/arch/arm64/configs/defconfig
> >
> >  CONFIG_QCOM_PDC=y
> > +CONFIG_MTK_SYSIRQ=m
> > +CONFIG_MTK_CIRQ=y
> >  CONFIG_RESET_QCOM_AOSS=y
> >
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -572,4 +572,18 @@ config LOONGSON_PCH_MSI
> >         help
> >           Support for the Loongson PCH MSI Controller.
> >
> > +config MTK_SYSIRQ
> > +       tristate "Mediatek interrupt polarity controller"
> > +       depends on ARCH_MEDIATEK || COMPILE_TEST
> > +       help
> > +         Interrupt polarity controller driver to swap polarity for
> > +         interrupts for Mediatek mobile chips.
> > +
> > +config MTK_CIRQ
> > +       bool "Mediatek low-power interrupt controller"
> > +       depends on ARCH_MEDIATEK || COMPILE_TEST
> > +       help
> > +         Low-power interrupt controller driver to monitor IRQS
> > +         in the sleep mode for Mediatek mobile chips.
> > +
> >
> >
> > P.S I'll make the irq-mtk-sysirq driver as a loadable kernel module for
> > GKI
>
> You might as well turn both drivers into modules. Saravana was working
> on a set of patches to ease this transition.

Sent out v2 of that patch now.
https://lore.kernel.org/lkml/20200717024447.3128361-1-saravanak@google.com/T/#u

-Saravana

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