[PATCH 0/5] ARM: OMAP2+: Add earlycon support

[PATCH 0/5] ARM: OMAP2+: Add earlycon support

[Lokesh Vutla]

This series adds earlycon support for all am33xx, am43xx, am57xx, dra7xx
based TI platforms. With this series just passing "earlycon" in bootargs
is sufficient for early debug.

Tested with omap2plus_defconfig + CONFIG_SERIAL_8250.

Lokesh Vutla (5):
  ARM: OMAP2+: omap_hwmod: Add support for earlycon
  ARM: dts: am33xx: Add stdout-path property
  ARM: dts: am43xx: Add stdout-path property
  ARM: dts: am57xx: Add stdout-path property
  ARM: dts: dra7xx: Add stdout-path property

 arch/arm/boot/dts/am335x-evm.dts                |  4 +++
 arch/arm/boot/dts/am335x-evmsk.dts              |  4 +++
 arch/arm/boot/dts/am335x-icev2.dts              |  4 +++
 arch/arm/boot/dts/am437x-gp-evm.dts             |  4 +++
 arch/arm/boot/dts/am437x-idk-evm.dts            |  4 +++
 arch/arm/boot/dts/am437x-sk-evm.dts             |  4 +++
 arch/arm/boot/dts/am43x-epos-evm.dts            |  4 +++
 arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi |  4 +++
 arch/arm/boot/dts/am57xx-idk-common.dtsi        |  4 +++
 arch/arm/boot/dts/dra7-evm.dts                  |  4 +++
 arch/arm/boot/dts/dra72-evm-common.dtsi         |  4 +++
 arch/arm/mach-omap2/omap_hwmod.c                | 36 +++++++++++++++++++++++++
 12 files changed, 80 insertions(+)

-- 
2.11.0

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[PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Lokesh Vutla]

Hwmod core tries to reset and idles each IP that is registered with hwmod.
In case of earlycon, that specific uart IP cannot be reset or keep it in
idle state else earlycon hangs once hwmod resets that uart IP. So add support
to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
is enabled.

Signed-off-by: Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org>
---
 arch/arm/mach-omap2/omap_hwmod.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index e8b988714a09..7b1ac69a2209 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -3249,6 +3249,39 @@ int __init omap_hwmod_setup_one(const char *oh_name)
 }
 
 /**
+ * omap_hwmod_setup_earlycon_flags - set up flags for early console
+ *
+ * Enable DEBUG_OMAPUART_FLAGS for uart hwmod that is being used as
+ * early concole so that hwmod core doesn't reset and keep it in idle
+ * that specific uart.
+ */
+#ifdef CONFIG_SERIAL_EARLYCON
+static void __init omap_hwmod_setup_earlycon_flags(void)
+{
+	struct device_node *np;
+	struct omap_hwmod *oh;
+	const char *uart;
+
+	np = of_find_node_by_path("/chosen");
+	if (!np)
+		np = of_find_node_by_path("/chosen@0");
+
+	if (np) {
+		uart = of_get_property(np, "stdout-path", NULL);
+		if (uart) {
+			np = of_find_node_by_path(uart);
+			if (np) {
+				uart = of_get_property(np, "ti,hwmods", NULL);
+				oh = omap_hwmod_lookup(uart);
+				if (oh)
+					oh->flags |= DEBUG_OMAPUART_FLAGS;
+			}
+		}
+	}
+}
+#endif
+
+/**
  * omap_hwmod_setup_all - set up all registered IP blocks
  *
  * Initialize and set up all IP blocks registered with the hwmod code.
@@ -3261,6 +3294,9 @@ static int __init omap_hwmod_setup_all(void)
 	_ensure_mpu_hwmod_is_setup(NULL);
 
 	omap_hwmod_for_each(_init, NULL);
+#ifdef CONFIG_SERIAL_EARLYCON
+	omap_hwmod_setup_earlycon_flags();
+#endif
 	omap_hwmod_for_each(_setup, NULL);
 
 	return 0;
-- 
2.11.0

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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Mark Rutland]

On Tue, Jan 17, 2017 at 09:33:32AM +0530, Lokesh Vutla wrote:
> Hwmod core tries to reset and idles each IP that is registered with hwmod.
> In case of earlycon, that specific uart IP cannot be reset or keep it in
> idle state else earlycon hangs once hwmod resets that uart IP. So add support
> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
> is enabled.

> +	np = of_find_node_by_path("/chosen");
> +	if (!np)
> +		np = of_find_node_by_path("/chosen@0");

I think you can drop the second case here. There shouldn't be an "@0" on
a chosen node; core code handles that only to cater for some legacy
(PPC?) DTBs, and I don't beleive it's necessary for OMAP.

Thanks,
Mark.
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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Lokesh Vutla]

On Tuesday 17 January 2017 04:17 PM, Mark Rutland wrote:
> On Tue, Jan 17, 2017 at 09:33:32AM +0530, Lokesh Vutla wrote:
>> Hwmod core tries to reset and idles each IP that is registered with hwmod.
>> In case of earlycon, that specific uart IP cannot be reset or keep it in
>> idle state else earlycon hangs once hwmod resets that uart IP. So add support
>> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
>> is enabled.
> 
>> +	np = of_find_node_by_path("/chosen");
>> +	if (!np)
>> +		np = of_find_node_by_path("/chosen@0");
> 
> I think you can drop the second case here. There shouldn't be an "@0" on
> a chosen node; core code handles that only to cater for some legacy
> (PPC?) DTBs, and I don't beleive it's necessary for OMAP.

Right. Ill repost this series by dropping this case.

Thanks and regards,
Lokesh
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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Tony Lindgren]

* Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170116 20:06]:
> Hwmod core tries to reset and idles each IP that is registered with hwmod.
> In case of earlycon, that specific uart IP cannot be reset or keep it in
> idle state else earlycon hangs once hwmod resets that uart IP. So add support
> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
> is enabled.

Nice :)

I guess this has no dependency to SERIAL_OMAP vs 8250_OMAP selection?

Regards,

Tony
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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Lokesh Vutla]

On Wednesday 18 January 2017 04:53 AM, Tony Lindgren wrote:
> * Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170116 20:06]:
>> Hwmod core tries to reset and idles each IP that is registered with hwmod.
>> In case of earlycon, that specific uart IP cannot be reset or keep it in
>> idle state else earlycon hangs once hwmod resets that uart IP. So add support
>> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
>> is enabled.
> 
> Nice :)
> 
> I guess this has no dependency to SERIAL_OMAP vs 8250_OMAP selection?

Unfortunately SERIAL_OMAP does not support earlycon yet. As I mentioned
in my cover letter, I verified this series only with 8250_OMAP.

Thanks and regards,
Lokesh
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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Tony Lindgren]

* Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170117 19:50]:
> 
> 
> On Wednesday 18 January 2017 04:53 AM, Tony Lindgren wrote:
> > * Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170116 20:06]:
> >> Hwmod core tries to reset and idles each IP that is registered with hwmod.
> >> In case of earlycon, that specific uart IP cannot be reset or keep it in
> >> idle state else earlycon hangs once hwmod resets that uart IP. So add support
> >> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
> >> is enabled.
> > 
> > Nice :)
> > 
> > I guess this has no dependency to SERIAL_OMAP vs 8250_OMAP selection?
> 
> Unfortunately SERIAL_OMAP does not support earlycon yet. As I mentioned
> in my cover letter, I verified this series only with 8250_OMAP.

OK. So just to understand why it would not work with omap-serial, do we
need something implemented in drivers/tty/serial/earlycon.c for non 8250
drivers to make it work? Or are there other dependencies?

Regards,

Tony
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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Lokesh Vutla]

On Wednesday 18 January 2017 10:30 PM, Tony Lindgren wrote:
> * Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170117 19:50]:
>>
>>
>> On Wednesday 18 January 2017 04:53 AM, Tony Lindgren wrote:
>>> * Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170116 20:06]:
>>>> Hwmod core tries to reset and idles each IP that is registered with hwmod.
>>>> In case of earlycon, that specific uart IP cannot be reset or keep it in
>>>> idle state else earlycon hangs once hwmod resets that uart IP. So add support
>>>> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
>>>> is enabled.
>>>
>>> Nice :)
>>>
>>> I guess this has no dependency to SERIAL_OMAP vs 8250_OMAP selection?
>>
>> Unfortunately SERIAL_OMAP does not support earlycon yet. As I mentioned
>> in my cover letter, I verified this series only with 8250_OMAP.
> 
> OK. So just to understand why it would not work with omap-serial, do we
> need something implemented in drivers/tty/serial/earlycon.c for non 8250
> drivers to make it work? Or are there other dependencies?

Yeah,  OF_EARLYCON_DECLARE should be declared for omap-serial. Just
posted a patch[1] adding support for earlycon in omap-serial.

[1] https://patchwork.kernel.org/patch/9525377/

Thanks and regards,
Lokesh
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Re: [PATCH 1/5] ARM: OMAP2+: omap_hwmod: Add support for earlycon

[Tony Lindgren]

* Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170119 02:08]:
> 
> 
> On Wednesday 18 January 2017 10:30 PM, Tony Lindgren wrote:
> > * Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170117 19:50]:
> >>
> >>
> >> On Wednesday 18 January 2017 04:53 AM, Tony Lindgren wrote:
> >>> * Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org> [170116 20:06]:
> >>>> Hwmod core tries to reset and idles each IP that is registered with hwmod.
> >>>> In case of earlycon, that specific uart IP cannot be reset or keep it in
> >>>> idle state else earlycon hangs once hwmod resets that uart IP. So add support
> >>>> to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
> >>>> is enabled.
> >>>
> >>> Nice :)
> >>>
> >>> I guess this has no dependency to SERIAL_OMAP vs 8250_OMAP selection?
> >>
> >> Unfortunately SERIAL_OMAP does not support earlycon yet. As I mentioned
> >> in my cover letter, I verified this series only with 8250_OMAP.
> > 
> > OK. So just to understand why it would not work with omap-serial, do we
> > need something implemented in drivers/tty/serial/earlycon.c for non 8250
> > drivers to make it work? Or are there other dependencies?
> 
> Yeah,  OF_EARLYCON_DECLARE should be declared for omap-serial. Just
> posted a patch[1] adding support for earlycon in omap-serial.

OK great. And with Vignesh's fix for omap5, I think we then have 8250-omap
and omap-serial behaving the same way on all SoC variants.

Regards,

Tony

> [1] https://patchwork.kernel.org/patch/9525377/

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[PATCH 2/5] ARM: dts: am33xx: Add stdout-path property

[Lokesh Vutla]

Add stdout-path property in /chosen node so that earlycon can be
used by just adding earlycon in bootargs.

Signed-off-by: Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org>
---
 arch/arm/boot/dts/am335x-evm.dts   | 4 ++++
 arch/arm/boot/dts/am335x-evmsk.dts | 4 ++++
 arch/arm/boot/dts/am335x-icev2.dts | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index c2186ec2834b..1c37a7c1ea17 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -25,6 +25,10 @@
 		reg = <0x80000000 0x10000000>; /* 256 MB */
 	};
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	vbat: fixedregulator0 {
 		compatible = "regulator-fixed";
 		regulator-name = "vbat";
diff --git a/arch/arm/boot/dts/am335x-evmsk.dts b/arch/arm/boot/dts/am335x-evmsk.dts
index e2548d1ce753..9e43c443738a 100644
--- a/arch/arm/boot/dts/am335x-evmsk.dts
+++ b/arch/arm/boot/dts/am335x-evmsk.dts
@@ -32,6 +32,10 @@
 		reg = <0x80000000 0x10000000>; /* 256 MB */
 	};
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	vbat: fixedregulator0 {
 		compatible = "regulator-fixed";
 		regulator-name = "vbat";
diff --git a/arch/arm/boot/dts/am335x-icev2.dts b/arch/arm/boot/dts/am335x-icev2.dts
index 1463df3b5b19..ff9417ce93c0 100644
--- a/arch/arm/boot/dts/am335x-icev2.dts
+++ b/arch/arm/boot/dts/am335x-icev2.dts
@@ -24,6 +24,10 @@
 		reg = <0x80000000 0x10000000>; /* 256 MB */
 	};
 
+	chosen {
+		stdout-path = &uart3;
+	};
+
 	vbat: fixedregulator0 {
 		compatible = "regulator-fixed";
 		regulator-name = "vbat";
-- 
2.11.0

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[PATCH 3/5] ARM: dts: am43xx: Add stdout-path property

[Lokesh Vutla]

Add stdout-path property in /chosen node so that earlycon can be
used by just adding earlycon in bootargs.

Signed-off-by: Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org>
---
 arch/arm/boot/dts/am437x-gp-evm.dts  | 4 ++++
 arch/arm/boot/dts/am437x-idk-evm.dts | 4 ++++
 arch/arm/boot/dts/am437x-sk-evm.dts  | 4 ++++
 arch/arm/boot/dts/am43x-epos-evm.dts | 4 ++++
 4 files changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/am437x-gp-evm.dts b/arch/arm/boot/dts/am437x-gp-evm.dts
index 957840cc7b78..a4f31739057f 100644
--- a/arch/arm/boot/dts/am437x-gp-evm.dts
+++ b/arch/arm/boot/dts/am437x-gp-evm.dts
@@ -23,6 +23,10 @@
 		display0 = &lcd0;
 	};
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	evm_v3_3d: fixedregulator-v3_3d {
 		compatible = "regulator-fixed";
 		regulator-name = "evm_v3_3d";
diff --git a/arch/arm/boot/dts/am437x-idk-evm.dts b/arch/arm/boot/dts/am437x-idk-evm.dts
index b76a7c0264a5..c1f7f9336e64 100644
--- a/arch/arm/boot/dts/am437x-idk-evm.dts
+++ b/arch/arm/boot/dts/am437x-idk-evm.dts
@@ -18,6 +18,10 @@
 	model = "TI AM437x Industrial Development Kit";
 	compatible = "ti,am437x-idk-evm","ti,am4372","ti,am43";
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	v24_0d: fixed-regulator-v24_0d {
 		compatible = "regulator-fixed";
 		regulator-name = "V24_0D";
diff --git a/arch/arm/boot/dts/am437x-sk-evm.dts b/arch/arm/boot/dts/am437x-sk-evm.dts
index 319d94205350..4dc54bee2f36 100644
--- a/arch/arm/boot/dts/am437x-sk-evm.dts
+++ b/arch/arm/boot/dts/am437x-sk-evm.dts
@@ -24,6 +24,10 @@
 		display0 = &lcd0;
 	};
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	/* fixed 32k external oscillator clock */
 	clk_32k_rtc: clk_32k_rtc {
 		#clock-cells = <0>;
diff --git a/arch/arm/boot/dts/am43x-epos-evm.dts b/arch/arm/boot/dts/am43x-epos-evm.dts
index 9d35c3f07cad..9acd4ccdec4e 100644
--- a/arch/arm/boot/dts/am43x-epos-evm.dts
+++ b/arch/arm/boot/dts/am43x-epos-evm.dts
@@ -24,6 +24,10 @@
 		display0 = &lcd0;
 	};
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	vmmcsd_fixed: fixedregulator-sd {
 		compatible = "regulator-fixed";
 		regulator-name = "vmmcsd_fixed";
-- 
2.11.0

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[PATCH 4/5] ARM: dts: am57xx: Add stdout-path property

[Lokesh Vutla]

Add stdout-path property in /chosen node so that earlycon can be
used by just adding earlycon in bootargs.

Signed-off-by: Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org>
---
 arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi | 4 ++++
 arch/arm/boot/dts/am57xx-idk-common.dtsi        | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi b/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
index 78bee26361f1..3a95db7da71f 100644
--- a/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
+++ b/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
@@ -22,6 +22,10 @@
 		display0 = &hdmi0;
 	};
 
+	chosen {
+		stdout-path = &uart3;
+	};
+
 	memory@0 {
 		device_type = "memory";
 		reg = <0x0 0x80000000 0x0 0x80000000>;
diff --git a/arch/arm/boot/dts/am57xx-idk-common.dtsi b/arch/arm/boot/dts/am57xx-idk-common.dtsi
index 814a720d5c3d..0d341c545b01 100644
--- a/arch/arm/boot/dts/am57xx-idk-common.dtsi
+++ b/arch/arm/boot/dts/am57xx-idk-common.dtsi
@@ -14,6 +14,10 @@
 		rtc1 = &rtc;
 	};
 
+	chosen {
+		stdout-path = &uart3;
+	};
+
 	vmain: fixedregulator-vmain {
 		compatible = "regulator-fixed";
 		regulator-name = "VMAIN";
-- 
2.11.0

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[PATCH 5/5] ARM: dts: dra7xx: Add stdout-path property

[Lokesh Vutla]

Add stdout-path property in /chosen node so that earlycon can be
used by just adding earlycon in bootargs.

Tested-by: Vignesh R <vigneshr-l0cyMroinI0@public.gmane.org>
Signed-off-by: Lokesh Vutla <lokeshvutla-l0cyMroinI0@public.gmane.org>
---
 arch/arm/boot/dts/dra7-evm.dts          | 4 ++++
 arch/arm/boot/dts/dra72-evm-common.dtsi | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 132f2be10889..b3923c049edb 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -21,6 +21,10 @@
 		reg = <0x0 0x80000000 0x0 0x60000000>; /* 1536 MB */
 	};
 
+	chosen {
+		stdout-path = &uart1;
+	};
+
 	evm_3v3_sd: fixedregulator-sd {
 		compatible = "regulator-fixed";
 		regulator-name = "evm_3v3_sd";
diff --git a/arch/arm/boot/dts/dra72-evm-common.dtsi b/arch/arm/boot/dts/dra72-evm-common.dtsi
index e50fbeea96e0..45b62138cbde 100644
--- a/arch/arm/boot/dts/dra72-evm-common.dtsi
+++ b/arch/arm/boot/dts/dra72-evm-common.dtsi
@@ -18,6 +18,10 @@
 		display0 = &hdmi0;
 	};
 
+	chosen {
+		stdout-path = &uart1;
+	};
+
 	evm_12v0: fixedregulator-evm12v0 {
 		/* main supply */
 		compatible = "regulator-fixed";
-- 
2.11.0

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