* [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
@ 2013-09-03 7:51 Jia Hongtao
2013-09-04 1:27 ` Yang,Wei
0 siblings, 1 reply; 10+ messages in thread
From: Jia Hongtao @ 2013-09-03 7:51 UTC (permalink / raw)
To: linuxppc-dev, B07421; +Cc: b38951
In both B4 and T4240QDS platform PCA9547 I2C bus multiplexer is used.
Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
---
arch/powerpc/boot/dts/b4qds.dtsi | 4 ++++
arch/powerpc/boot/dts/t4240qds.dts | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/powerpc/boot/dts/b4qds.dtsi b/arch/powerpc/boot/dts/b4qds.dtsi
index e6d2f8f..2aa3399 100644
--- a/arch/powerpc/boot/dts/b4qds.dtsi
+++ b/arch/powerpc/boot/dts/b4qds.dtsi
@@ -120,6 +120,10 @@
};
i2c@118000 {
+ pca9547@77 {
+ compatible = "philips,pca9547";
+ reg = <0x77>;
+ };
eeprom@50 {
compatible = "at24,24c64";
reg = <0x50>;
diff --git a/arch/powerpc/boot/dts/t4240qds.dts b/arch/powerpc/boot/dts/t4240qds.dts
index 0555976..084db57 100644
--- a/arch/powerpc/boot/dts/t4240qds.dts
+++ b/arch/powerpc/boot/dts/t4240qds.dts
@@ -118,6 +118,10 @@
};
i2c@118000 {
+ pca9547@77 {
+ compatible = "philips,pca9547";
+ reg = <0x77>;
+ };
eeprom@51 {
compatible = "at24,24c256";
reg = <0x51>;
--
1.8.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-03 7:51 [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS Jia Hongtao
@ 2013-09-04 1:27 ` Yang,Wei
2013-09-04 3:30 ` Tang Yuantian-B29983
2013-09-04 3:37 ` Jia Hongtao-B38951
0 siblings, 2 replies; 10+ messages in thread
From: Yang,Wei @ 2013-09-04 1:27 UTC (permalink / raw)
To: Jia Hongtao; +Cc: B07421, linuxppc-dev, b38951
On 09/03/2013 03:51 PM, Jia Hongtao wrote:
> In both B4 and T4240QDS platform PCA9547 I2C bus multiplexer is used.
Hi Hongtao,
If you want to support I2C bus multiplexer, for T4 and B4QDS platform,
since some eeprom devices is connected to PCA9574 I2C bus
multiplexer, so these devices should be connected to pca9547 node. Just
like the following, what do you think of it?
+ pca9547@77 {
+ compatible = "philips,pca9547";
+ reg = <0x77>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ channel@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+ eeprom@51 {
+ compatible =
"at24,24c256";
+ reg = <0x51>;
+ };
+ eeprom@52 {
+ compatible =
"at24,24c256";
+ reg = <0x52>;
+ };
+ eeprom@53 {
+ compatible =
"at24,24c256";
+ reg = <0x53>;
+ };
+ eeprom@54 {
+ compatible =
"at24,24c256";
+ reg = <0x54>;
+ };
+ eeprom@55 {
+ compatible =
"at24,24c256";
+ reg = <0x55>;
+ };
+ eeprom@56 {
+ compatible =
"at24,24c256";
+ reg = <0x56>;
+ };
+ rtc@68 {
+ compatible =
"dallas,ds3232";
+ reg = <0x68>;
+ interrupts =
<0x1 0x1 0 0>;
+ };
+ };
Wei
>
> Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
> ---
> arch/powerpc/boot/dts/b4qds.dtsi | 4 ++++
> arch/powerpc/boot/dts/t4240qds.dts | 4 ++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/arch/powerpc/boot/dts/b4qds.dtsi b/arch/powerpc/boot/dts/b4qds.dtsi
> index e6d2f8f..2aa3399 100644
> --- a/arch/powerpc/boot/dts/b4qds.dtsi
> +++ b/arch/powerpc/boot/dts/b4qds.dtsi
> @@ -120,6 +120,10 @@
> };
>
> i2c@118000 {
> + pca9547@77 {
> + compatible = "philips,pca9547";
> + reg = <0x77>;
> + };
> eeprom@50 {
> compatible = "at24,24c64";
> reg = <0x50>;
> diff --git a/arch/powerpc/boot/dts/t4240qds.dts b/arch/powerpc/boot/dts/t4240qds.dts
> index 0555976..084db57 100644
> --- a/arch/powerpc/boot/dts/t4240qds.dts
> +++ b/arch/powerpc/boot/dts/t4240qds.dts
> @@ -118,6 +118,10 @@
> };
>
> i2c@118000 {
> + pca9547@77 {
> + compatible = "philips,pca9547";
> + reg = <0x77>;
> + };
> eeprom@51 {
> compatible = "at24,24c256";
> reg = <0x51>;
^ permalink raw reply [flat|nested] 10+ messages in thread
* RE: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-04 1:27 ` Yang,Wei
@ 2013-09-04 3:30 ` Tang Yuantian-B29983
2013-09-05 18:40 ` Scott Wood
2013-09-04 3:37 ` Jia Hongtao-B38951
1 sibling, 1 reply; 10+ messages in thread
From: Tang Yuantian-B29983 @ 2013-09-04 3:30 UTC (permalink / raw)
To: Yang,Wei, Jia Hongtao-B38951
Cc: Wood Scott-B07421, linuxppc-dev, Jia Hongtao-B38951
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^ permalink raw reply [flat|nested] 10+ messages in thread
* RE: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-04 1:27 ` Yang,Wei
2013-09-04 3:30 ` Tang Yuantian-B29983
@ 2013-09-04 3:37 ` Jia Hongtao-B38951
2013-09-04 4:03 ` Tang Yuantian-B29983
1 sibling, 1 reply; 10+ messages in thread
From: Jia Hongtao-B38951 @ 2013-09-04 3:37 UTC (permalink / raw)
To: Yang,Wei; +Cc: Wood Scott-B07421, linuxppc-dev
Hi Wei,
I totally agree that the i2c nodes topology should end up like you said.
But I think adding sub-nodes should step by step.
Actually the hardware i2c topology are huge like on T4.
So I'd like to adding nodes when we needed.
If you think the sub-nodes are needed please send another patch based on mi=
ne.
I think this is the more reasonable way.
Thanks.
-Hongtao
> -----Original Message-----
> From: Yang,Wei [mailto:Wei.Yang@windriver.com]
> Sent: Wednesday, September 04, 2013 9:27 AM
> To: Jia Hongtao-B38951
> Cc: linuxppc-dev@lists.ozlabs.org; Wood Scott-B07421; Jia Hongtao-B38951
> Subject: Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and
> T4240QDS
>=20
> On 09/03/2013 03:51 PM, Jia Hongtao wrote:
> > In both B4 and T4240QDS platform PCA9547 I2C bus multiplexer is used.
>=20
> Hi Hongtao,
>=20
> If you want to support I2C bus multiplexer, for T4 and B4QDS platform,
> since some eeprom devices is connected to PCA9574 I2C bus multiplexer, so
> these devices should be connected to pca9547 node. Just like the
> following, what do you think of it?
>=20
> + pca9547@77 {
> + compatible =3D "philips,pca9547";
> + reg =3D <0x77>;
> + #address-cells =3D <1>;
> + #size-cells =3D <0>;
> + channel@0 {
> + #address-cells =3D <1>;
> + #size-cells =3D <0>;
> + reg =3D <0>;
> + eeprom@51 {
> + compatible =3D
> "at24,24c256";
> + reg =3D <0x51>;
> + };
> + eeprom@52 {
> + compatible =3D
> "at24,24c256";
> + reg =3D <0x52>;
> + };
> + eeprom@53 {
> + compatible =3D
> "at24,24c256";
> + reg =3D <0x53>;
> + };
> + eeprom@54 {
> + compatible =3D
> "at24,24c256";
> + reg =3D <0x54>;
> + };
> + eeprom@55 {
> + compatible =3D
> "at24,24c256";
> + reg =3D <0x55>;
> + };
> + eeprom@56 {
> + compatible =3D
> "at24,24c256";
> + reg =3D <0x56>;
> + };
> + rtc@68 {
> + compatible =3D
> "dallas,ds3232";
> + reg =3D <0x68>;
> + interrupts =3D
> <0x1 0x1 0 0>;
> + };
> + };
>=20
> Wei
> >
> > Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
> > ---
> > arch/powerpc/boot/dts/b4qds.dtsi | 4 ++++
> > arch/powerpc/boot/dts/t4240qds.dts | 4 ++++
> > 2 files changed, 8 insertions(+)
> >
> > diff --git a/arch/powerpc/boot/dts/b4qds.dtsi
> > b/arch/powerpc/boot/dts/b4qds.dtsi
> > index e6d2f8f..2aa3399 100644
> > --- a/arch/powerpc/boot/dts/b4qds.dtsi
> > +++ b/arch/powerpc/boot/dts/b4qds.dtsi
> > @@ -120,6 +120,10 @@
> > };
> >
> > i2c@118000 {
> > + pca9547@77 {
> > + compatible =3D "philips,pca9547";
> > + reg =3D <0x77>;
> > + };
> > eeprom@50 {
> > compatible =3D "at24,24c64";
> > reg =3D <0x50>;
> > diff --git a/arch/powerpc/boot/dts/t4240qds.dts
> > b/arch/powerpc/boot/dts/t4240qds.dts
> > index 0555976..084db57 100644
> > --- a/arch/powerpc/boot/dts/t4240qds.dts
> > +++ b/arch/powerpc/boot/dts/t4240qds.dts
> > @@ -118,6 +118,10 @@
> > };
> >
> > i2c@118000 {
> > + pca9547@77 {
> > + compatible =3D "philips,pca9547";
> > + reg =3D <0x77>;
> > + };
> > eeprom@51 {
> > compatible =3D "at24,24c256";
> > reg =3D <0x51>;
>=20
^ permalink raw reply [flat|nested] 10+ messages in thread
* RE: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-04 3:37 ` Jia Hongtao-B38951
@ 2013-09-04 4:03 ` Tang Yuantian-B29983
2013-09-04 4:10 ` Jia Hongtao-B38951
2013-09-04 4:27 ` Yang,Wei
0 siblings, 2 replies; 10+ messages in thread
From: Tang Yuantian-B29983 @ 2013-09-04 4:03 UTC (permalink / raw)
To: Jia Hongtao-B38951, Yang,Wei; +Cc: Wood Scott-B07421, linuxppc-dev
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^ permalink raw reply [flat|nested] 10+ messages in thread
* RE: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-04 4:03 ` Tang Yuantian-B29983
@ 2013-09-04 4:10 ` Jia Hongtao-B38951
2013-09-04 4:27 ` Yang,Wei
1 sibling, 0 replies; 10+ messages in thread
From: Jia Hongtao-B38951 @ 2013-09-04 4:10 UTC (permalink / raw)
To: Tang Yuantian-B29983, Yang,Wei; +Cc: Wood Scott-B07421, linuxppc-dev
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-04 4:03 ` Tang Yuantian-B29983
2013-09-04 4:10 ` Jia Hongtao-B38951
@ 2013-09-04 4:27 ` Yang,Wei
1 sibling, 0 replies; 10+ messages in thread
From: Yang,Wei @ 2013-09-04 4:27 UTC (permalink / raw)
To: Tang Yuantian-B29983; +Cc: Wood Scott-B07421, linuxppc-dev, Jia Hongtao-B38951
On 09/04/2013 12:03 PM, Tang Yuantian-B29983 wrote:
> Hi,
> I noticed that there are already some nodes in i2c bus.
Sorry for my late response, yeah, just as you noticed, some eeprom nodes
already are inside i2c bus.:-)
Wei
> You should at least move the existing node into PCA9547.
>
> Thanks,
> Yuantian
>
>
>> -----Original Message-----
>> From: Linuxppc-dev [mailto:linuxppc-dev-
>> bounces+b29983=freescale.com@lists.ozlabs.org] On Behalf Of Jia Hongtao-
>> B38951
>> Sent: 2013年9月4日 星期三 11:38
>> To: Yang,Wei
>> Cc: Wood Scott-B07421; linuxppc-dev@lists.ozlabs.org
>> Subject: RE: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and
>> T4240QDS
>>
>> Hi Wei,
>>
>> I totally agree that the i2c nodes topology should end up like you said.
>>
>> But I think adding sub-nodes should step by step.
>> Actually the hardware i2c topology are huge like on T4.
>> So I'd like to adding nodes when we needed.
>> If you think the sub-nodes are needed please send another patch based on
>> mine.
>> I think this is the more reasonable way.
>>
>> Thanks.
>>
>> -Hongtao
>>
>>
>>> -----Original Message-----
>>> From: Yang,Wei [mailto:Wei.Yang@windriver.com]
>>> Sent: Wednesday, September 04, 2013 9:27 AM
>>> To: Jia Hongtao-B38951
>>> Cc: linuxppc-dev@lists.ozlabs.org; Wood Scott-B07421; Jia
>>> Hongtao-B38951
>>> Subject: Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and
>>> T4240QDS
>>>
>>> On 09/03/2013 03:51 PM, Jia Hongtao wrote:
>>>> In both B4 and T4240QDS platform PCA9547 I2C bus multiplexer is used.
>>> Hi Hongtao,
>>>
>>> If you want to support I2C bus multiplexer, for T4 and B4QDS platform,
>>> since some eeprom devices is connected to PCA9574 I2C bus multiplexer,
>>> so these devices should be connected to pca9547 node. Just like the
>>> following, what do you think of it?
>>>
>>> + pca9547@77 {
>>> + compatible = "philips,pca9547";
>>> + reg = <0x77>;
>>> + #address-cells = <1>;
>>> + #size-cells = <0>;
>>> + channel@0 {
>>> + #address-cells = <1>;
>>> + #size-cells = <0>;
>>> + reg = <0>;
>>> + eeprom@51 {
>>> + compatible =
>>> "at24,24c256";
>>> + reg = <0x51>;
>>> + };
>>> + eeprom@52 {
>>> + compatible =
>>> "at24,24c256";
>>> + reg = <0x52>;
>>> + };
>>> + eeprom@53 {
>>> + compatible =
>>> "at24,24c256";
>>> + reg = <0x53>;
>>> + };
>>> + eeprom@54 {
>>> + compatible =
>>> "at24,24c256";
>>> + reg = <0x54>;
>>> + };
>>> + eeprom@55 {
>>> + compatible =
>>> "at24,24c256";
>>> + reg = <0x55>;
>>> + };
>>> + eeprom@56 {
>>> + compatible =
>>> "at24,24c256";
>>> + reg = <0x56>;
>>> + };
>>> + rtc@68 {
>>> + compatible =
>>> "dallas,ds3232";
>>> + reg = <0x68>;
>>> + interrupts =
>>> <0x1 0x1 0 0>;
>>> + };
>>> + };
>>>
>>> Wei
>>>> Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
>>>> ---
>>>> arch/powerpc/boot/dts/b4qds.dtsi | 4 ++++
>>>> arch/powerpc/boot/dts/t4240qds.dts | 4 ++++
>>>> 2 files changed, 8 insertions(+)
>>>>
>>>> diff --git a/arch/powerpc/boot/dts/b4qds.dtsi
>>>> b/arch/powerpc/boot/dts/b4qds.dtsi
>>>> index e6d2f8f..2aa3399 100644
>>>> --- a/arch/powerpc/boot/dts/b4qds.dtsi
>>>> +++ b/arch/powerpc/boot/dts/b4qds.dtsi
>>>> @@ -120,6 +120,10 @@
>>>> };
>>>>
>>>> i2c@118000 {
>>>> + pca9547@77 {
>>>> + compatible = "philips,pca9547";
>>>> + reg = <0x77>;
>>>> + };
>>>> eeprom@50 {
>>>> compatible = "at24,24c64";
>>>> reg = <0x50>;
>>>> diff --git a/arch/powerpc/boot/dts/t4240qds.dts
>>>> b/arch/powerpc/boot/dts/t4240qds.dts
>>>> index 0555976..084db57 100644
>>>> --- a/arch/powerpc/boot/dts/t4240qds.dts
>>>> +++ b/arch/powerpc/boot/dts/t4240qds.dts
>>>> @@ -118,6 +118,10 @@
>>>> };
>>>>
>>>> i2c@118000 {
>>>> + pca9547@77 {
>>>> + compatible = "philips,pca9547";
>>>> + reg = <0x77>;
>>>> + };
>>>> eeprom@51 {
>>>> compatible = "at24,24c256";
>>>> reg = <0x51>;
>>
>> _______________________________________________
>> Linuxppc-dev mailing list
>> Linuxppc-dev@lists.ozlabs.org
>> https://lists.ozlabs.org/listinfo/linuxppc-dev
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-04 3:30 ` Tang Yuantian-B29983
@ 2013-09-05 18:40 ` Scott Wood
2013-09-06 2:30 ` Tang Yuantian-B29983
0 siblings, 1 reply; 10+ messages in thread
From: Scott Wood @ 2013-09-05 18:40 UTC (permalink / raw)
To: Tang Yuantian-B29983
Cc: Wood Scott-B07421, linuxppc-dev, Yang, Wei, Jia Hongtao-B38951
On Tue, 2013-09-03 at 22:30 -0500, Tang Yuantian-B29983 wrote:
> Hi,
>
> These eeproms are never used by kernel. So no need to add them.
The device tree describes the hardware, not what Linux does with it.
-Scott
^ permalink raw reply [flat|nested] 10+ messages in thread
* RE: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-05 18:40 ` Scott Wood
@ 2013-09-06 2:30 ` Tang Yuantian-B29983
2013-09-06 15:17 ` Scott Wood
0 siblings, 1 reply; 10+ messages in thread
From: Tang Yuantian-B29983 @ 2013-09-06 2:30 UTC (permalink / raw)
To: Wood Scott-B07421; +Cc: linuxppc-dev, Yang, Wei, Jia Hongtao-B38951
DQo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IFdvb2QgU2NvdHQtQjA3NDIx
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aXMgbm90IGRlc2NyaWJpbmcgdGhlIGhhcmR3YXJlLg0KVGhlcmUgYXJlIGFsbW9zdCBmaWZ0eSBJ
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ZWVkIHRvIGxpc3QgdGhlbSBhbGw/DQoNClJlZ2FyZHMsDQpZdWFudGlhbg0KDQo+IC1TY290dA0K
PiANCg0K
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
2013-09-06 2:30 ` Tang Yuantian-B29983
@ 2013-09-06 15:17 ` Scott Wood
0 siblings, 0 replies; 10+ messages in thread
From: Scott Wood @ 2013-09-06 15:17 UTC (permalink / raw)
To: Tang Yuantian-B29983
Cc: Wood Scott-B07421, linuxppc-dev, Yang, Wei, Jia Hongtao-B38951
On Thu, 2013-09-05 at 21:30 -0500, Tang Yuantian-B29983 wrote:
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: 2013=E5=B9=B49=E6=9C=886=E6=97=A5 =E6=98=9F=E6=9C=9F=E4=BA=94 2=
:41
> > To: Tang Yuantian-B29983
> > Cc: Yang,Wei; Jia Hongtao-B38951; Wood Scott-B07421; linuxppc-
> > dev@lists.ozlabs.org
> > Subject: Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and
> > T4240QDS
> >=20
> > On Tue, 2013-09-03 at 22:30 -0500, Tang Yuantian-B29983 wrote:
> > > Hi,
> > >
> > > These eeproms are never used by kernel. So no need to add them.
> >=20
> > The device tree describes the hardware, not what Linux does with it.
> >=20
> Missing some nodes doesn't mean it is not describing the hardware.
> There are almost fifty I2C devices on T4 connected to PCA9547.
> Do you think we need to list them all?
Ideally, yes. I realize it's not uncommon for some things to be
missing, but that's not a reason to tell people to leave things out just
because Linux doesn't use them.
-Scott
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2013-09-06 15:17 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-09-03 7:51 [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS Jia Hongtao
2013-09-04 1:27 ` Yang,Wei
2013-09-04 3:30 ` Tang Yuantian-B29983
2013-09-05 18:40 ` Scott Wood
2013-09-06 2:30 ` Tang Yuantian-B29983
2013-09-06 15:17 ` Scott Wood
2013-09-04 3:37 ` Jia Hongtao-B38951
2013-09-04 4:03 ` Tang Yuantian-B29983
2013-09-04 4:10 ` Jia Hongtao-B38951
2013-09-04 4:27 ` Yang,Wei
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