linux-kernel - Re: [PATCH 1/2] mfd: ti_am335x_tscadc: Provide unique name for child mfd cells

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Date:   Wed, 28 Nov 2018 14:51:48 +0530
From:   Vignesh R <vigneshr@...com>
To:     Lee Jones <lee.jones@...aro.org>
CC:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        <linux-iio@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mfd: ti_am335x_tscadc: Provide unique name for child
 mfd cells

Hi,

On 28/11/18 2:37 PM, Lee Jones wrote:
> On Mon, 19 Nov 2018, Vignesh R wrote:
> 
>> Provide unique names for child mfd cells, this is required in order to
>> support registering of multiple instances of same ti_am335x_tscadc IP.
> 
> I don't think it is.  What is the error you are receiving?
> 

W/o this patch I get:

[    2.296839] sysfs: cannot create duplicate filename '/bus/platform/devices/TI-am335x-adc'
[    2.305085] CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted 4.20.0-rc3-next-20181123-00018-g
7791ce8f123f-dirty #182
[    2.315254] Hardware name: Texas Instruments AM654 Base Board (DT)
[    2.321447] Workqueue: events deferred_probe_work_func
[    2.326585] Call trace:
[    2.329036]  dump_backtrace+0x0/0x1c0
[    2.332699]  show_stack+0x14/0x20
[    2.336017]  dump_stack+0x9c/0xbc
[    2.339333]  sysfs_warn_dup+0x60/0x78
[    2.342995]  sysfs_do_create_link_sd.isra.0+0xdc/0xe8
[    2.348042]  sysfs_create_link+0x20/0x40
[    2.351963]  bus_add_device+0x68/0x130
[    2.355711]  device_add+0x398/0x618
[    2.359199]  platform_device_add+0x120/0x290
[    2.363469]  mfd_add_device+0x23c/0x2e8
[    2.367302]  mfd_add_devices+0xb4/0x158
[    2.371136]  ti_tscadc_probe+0x35c/0x4c8
[    2.375056]  platform_drv_probe+0x50/0xa0
[    2.379062]  really_probe+0x204/0x2a8
[    2.382722]  driver_probe_device+0x58/0x100
[    2.386903]  __device_attach_driver+0x98/0xf0
[    2.391258]  bus_for_each_drv+0x64/0xc8
[    2.395091]  __device_attach+0xd8/0x138
[    2.398923]  device_initial_probe+0x10/0x18
[    2.403103]  bus_probe_device+0x90/0x98
[    2.406938]  deferred_probe_work_func+0x74/0xb0
[    2.411470]  process_one_work+0x1e0/0x330
[    2.415478]  worker_thread+0x238/0x460
[    2.419225]  kthread+0x128/0x130
[    2.422452]  ret_from_fork+0x10/0x1c
[    2.426195] ti_am3359-tscadc: probe of 40210000.tscadc failed with error -1

>> Signed-off-by: Vignesh R <vigneshr@...com>
>> ---
>>  drivers/mfd/ti_am335x_tscadc.c | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
>> index c2d47d78705b..ee08af34f81d 100644
>> --- a/drivers/mfd/ti_am335x_tscadc.c
>> +++ b/drivers/mfd/ti_am335x_tscadc.c
>> @@ -248,7 +248,8 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
>>  	if (tsc_wires > 0) {
>>  		tscadc->tsc_cell = tscadc->used_cells;
>>  		cell = &tscadc->cells[tscadc->used_cells++];
>> -		cell->name = "TI-am335x-tsc";
>> +		cell->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s:%s",
>> +					    dev_name(&pdev->dev), "tsc");
>>  		cell->of_compatible = "ti,am3359-tsc";
>>  		cell->platform_data = &tscadc;
>>  		cell->pdata_size = sizeof(tscadc);
>> @@ -258,7 +259,8 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
>>  	if (adc_channels > 0) {
>>  		tscadc->adc_cell = tscadc->used_cells;
>>  		cell = &tscadc->cells[tscadc->used_cells++];
>> -		cell->name = "TI-am335x-adc";
>> +		cell->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s:%s",
>> +					    dev_name(&pdev->dev), "adc");
>>  		cell->of_compatible = "ti,am3359-adc";
>>  		cell->platform_data = &tscadc;
>>  		cell->pdata_size = sizeof(tscadc);
> 

-- 
Regards
Vignesh