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SubjectRe: [PATCH 1/2] mfd: ti_am335x_tscadc: Provide unique name for child mfd cells
On Wed, 28 Nov 2018, Vignesh R wrote:

> 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

That's because of the way the cells are being registered:

err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
tscadc->used_cells, NULL, 0, NULL);

The cells are not numbered (tscadc->cells->id is always 0) and you are
forcing the use of the platform ID from the parent platform device
(with pdev->id here). Instead you should s/pdev->id/PLATFORM_DEVID_AUTO/
or number the cells manually. I suggest the former.

> >> Signed-off-by: Vignesh R <vigneshr@ti.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);
> >
>

--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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