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Message-ID: <4F6B5A22.1090204@cavium.com>
Date: Thu, 22 Mar 2012 09:58:10 -0700
From: David Daney <david.daney@...ium.com>
To: Karol Lewandowski <k.lewandowsk@...sung.com>
CC: "w.sang@...gutronix.de" <w.sang@...gutronix.de>,
"hskinnemoen@...il.com" <hskinnemoen@...il.com>,
"linux@....linux.org.uk" <linux@....linux.org.uk>,
Rade Bozic <rade.bozic.ext@....com>,
"ben-linux@...ff.org" <ben-linux@...ff.org>,
"khali@...ux-fr.org" <khali@...ux-fr.org>,
"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dirk.brandewie@...il.com" <dirk.brandewie@...il.com>,
"bigeasy@...utronix.de" <bigeasy@...utronix.de>,
"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
"Daney, David" <David.Daney@...iumnetworks.com>
Subject: Re: [PATCH 2/2] i2c: Dynamically assign adapter id if it wasn't explictly
specified
On 03/22/2012 08:28 AM, Karol Lewandowski wrote:
> On 16.03.2012 13:19, Karol Lewandowski wrote:
>
>>> Commit 488bf314b ("i2c: Allow i2c_add_numbered_adapter() to assign a
>>> bus id") reworked i2c_add_numbered_adapter() to call i2c_add_adapter()
>>> if requested bus was -1.
>
>>> This allows to simplify driver's initialization procedure as it allows
>
>>> static and dynamic adapter id registration using one function.
>>>
>>> This patch updates few more drivers (missed out in original patch) to
>>> use this functionality.
>>
>
>> [ I must have lost actual problem description while rewording
>> message itself... ]
>>
>> Problem arises when multiple drivers (or multiple instances
>> of one driver) try to assume the same fixed bus number (0).
>>
>> This simply causes i2c_add_numbered_bus() to fail.
>> Leaving -1 works perfectly, as registration function switches
>> to dynamic id registration.
>
>>> Signed-off-by: Karol Lewandowski<k.lewandowsk@...sung.com>
>>> Signed-off-by: Kyungmin Park<kyungmin.park@...sung.com>
>>> ---
>>> drivers/i2c/busses/i2c-gpio.c | 7 +------
>>> drivers/i2c/busses/i2c-octeon.c | 2 +-
>>> drivers/i2c/busses/i2c-pca-platform.c | 2 +-
>>> drivers/i2c/busses/i2c-versatile.c | 9 ++-------
>>> 4 files changed, 5 insertions(+), 15 deletions(-)
>
>
> Dear Haavard, Rade, Wolfram and Russel
>
> Could you review following changes for gpio, octeon, pca-platform
> and versatile i2c controller drivers (for which you are, or were,
> maintainers)?
>
> Grant requested explicit Ack to get this merged.
>
> Thanks!
>
>>
>> diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
>> index a651779..50a2a94 100644
>> --- a/drivers/i2c/busses/i2c-gpio.c
>> +++ b/drivers/i2c/busses/i2c-gpio.c
>> @@ -144,12 +144,7 @@ static int __devinit i2c_gpio_probe(struct platform_device *pdev)
>> adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
>> adap->dev.parent =&pdev->dev;
>>
>> - /*
>> - * If "dev->id" is negative we consider it as zero.
>> - * The reason to do so is to avoid sysfs names that only make
>> - * sense when there are multiple adapters.
>> - */
>> - adap->nr = (pdev->id != -1) ? pdev->id : 0;
>> + adap->nr = pdev->id;
>> ret = i2c_bit_add_numbered_bus(adap);
>> if (ret)
>> goto err_add_bus;
>> diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
>> index ee139a5..8470232 100644
>> --- a/drivers/i2c/busses/i2c-octeon.c
>> +++ b/drivers/i2c/busses/i2c-octeon.c
>> @@ -581,7 +581,7 @@ static int __devinit octeon_i2c_probe(struct platform_device *pdev)
>>
>> i2c->adap = octeon_i2c_ops;
>> i2c->adap.dev.parent =&pdev->dev;
>> - i2c->adap.nr = pdev->id>= 0 ? pdev->id : 0;
>> + i2c->adap.nr = pdev->id;
I guess the OCTEON bit seems sane enough. I don't fully understand why
this needs changing, because OCTEON platform code always passes a
non-negative pdev->id. But since you asked for it:
Acked-by: David Daney <david.daney@...ium.com>
>> i2c_set_adapdata(&i2c->adap, i2c);
>> platform_set_drvdata(pdev, i2c);
>>
>> diff --git a/drivers/i2c/busses/i2c-pca-platform.c b/drivers/i2c/busses/i2c-pca-platform.c
>> index 2adbf1a..675878f 100644
>> --- a/drivers/i2c/busses/i2c-pca-platform.c
>> +++ b/drivers/i2c/busses/i2c-pca-platform.c
>> @@ -171,7 +171,7 @@ static int __devinit i2c_pca_pf_probe(struct platform_device *pdev)
>> i2c->io_size = resource_size(res);
>> i2c->irq = irq;
>>
>> - i2c->adap.nr = pdev->id>= 0 ? pdev->id : 0;
>> + i2c->adap.nr = pdev->id;
>> i2c->adap.owner = THIS_MODULE;
>> snprintf(i2c->adap.name, sizeof(i2c->adap.name),
>> "PCA9564/PCA9665 at 0x%08lx",
>> diff --git a/drivers/i2c/busses/i2c-versatile.c b/drivers/i2c/busses/i2c-versatile.c
>> index 6055601..9458568 100644
>> --- a/drivers/i2c/busses/i2c-versatile.c
>> +++ b/drivers/i2c/busses/i2c-versatile.c
>> @@ -102,13 +102,8 @@ static int i2c_versatile_probe(struct platform_device *dev)
>> i2c->algo = i2c_versatile_algo;
>> i2c->algo.data = i2c;
>>
>> - if (dev->id>= 0) {
>> - /* static bus numbering */
>> - i2c->adap.nr = dev->id;
>> - ret = i2c_bit_add_numbered_bus(&i2c->adap);
>> - } else
>> - /* dynamic bus numbering */
>> - ret = i2c_bit_add_bus(&i2c->adap);
>> + i2c->adap.nr = dev->id;
>> + ret = i2c_bit_add_numbered_bus(&i2c->adap);
>> if (ret>= 0) {
>> platform_set_drvdata(dev, i2c);
>> return 0;
>
>
>
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