From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "H. Nikolaus Schaller" <hns@goldelico.com>
Cc: Tony Lindgren <tony@atomide.com>,
Jonathan Cameron <jic23@kernel.org>,
Lee Jones <lee.jones@linaro.org>,
linux-iio@vger.kernel.org,
Linux-OMAP <linux-omap@vger.kernel.org>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Ryan Barnett <ryan.barnett@collins.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Discussions about the Letux Kernel
<letux-kernel@openphoenux.org>
Subject: Re: [PATCH v6 14/48] mfd: ti_am335x_tscadc: Don't search the tree for our clock
Date: Mon, 7 Mar 2022 12:10:33 +0100 [thread overview]
Message-ID: <20220307121033.5630fee7@xps13> (raw)
In-Reply-To: <7336E356-57E3-4BC5-B098-0A791C2CB360@goldelico.com>
Hi Nikolaus,
hns@goldelico.com wrote on Fri, 4 Mar 2022 23:38:25 +0100:
> Hi Miquel,
> I recently found that our BeagleBoneBlack with external touch screen stopped
> to find it.
>
> A git bisect revealed this patch (merged into v5.16-rc1) as the first bad:
>
> > Am 15.10.2021 um 10:14 schrieb Miquel Raynal <miquel.raynal@bootlin.com>:
> >
> > There is a single clock available in our node, which is named
> > "fck". The clock handler then points to adc_tsc_fck but no need to point
> > directly to it and do a full tree search.
> >
> > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> > ---
> > drivers/mfd/ti_am335x_tscadc.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> > index e2c4416f192d..8af44c08d925 100644
> > --- a/drivers/mfd/ti_am335x_tscadc.c
> > +++ b/drivers/mfd/ti_am335x_tscadc.c
> > @@ -206,7 +206,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)
> > * This frequency is valid since TSC_ADC_SS controller design
> > * assumes the OCP clock is at least 6x faster than the ADC clock.
> > */
> > - clk = devm_clk_get(&pdev->dev, "adc_tsc_fck");
> > + clk = devm_clk_get(&pdev->dev, NULL);
> > if (IS_ERR(clk)) {
> > dev_err(&pdev->dev, "failed to get TSC fck\n");
> > err = PTR_ERR(clk);
> > --
> > 2.27.0
> >
>
> While I understand the reasons for this change there seems to be something
> missing now in the device tree because the clock isn't found any more.
>
> After knowing about the problem I could also locate the log entry:
>
> [ 4.456680] ti_am3359-tscadc 44e0d000.tscadc: failed to get TSC fck
>
> Reverting your patch makes it work again.
Sorry for the wrong behavior on your side and thanks for the
investigation.
> Is there missing a change in the am335x-boneblack or am335x DTS?
I've looked at the code and indeed the am33xx-clock.dtsi file defines
the touchscreen clock, but unfortunately the am33xx-l4.dtsi file which
defines the touchscreen node does not reference the clock. The bindings
clearly require the clocks to be referenced but I believe this was not
noticed until now because the clock exist and clk_get() did a lookup
across the tree.
On my side I tested it with an am437x SoC which uses another base
device tree, which properly references the touchscreen clock where it's
needed.
I will send a patch (untested), can you give it a try and report if it
fixes your issue?
>
> Our (private) DTS looks like this, i.e. we don't play with clocks inherited
> from mainline tree:
>
> #include "am335x-boneblack.dts"
>
> ...
>
> &tscadc {
> status = "okay";
>
> tsc {
> ti,wires = <4>;
> ti,x-plate-resistance = <600>;
> ti,coordinate-readouts = <5>;
> ti,wire-config = <0x00 0x11 0x22 0x33>;
> };
>
> adc {
> ti,adc-channels = <4 5 6 7>;
> };
> };
>
> BR and thanks,
> Nikolaus
Thanks,
Miquèl
next prev parent reply other threads:[~2022-03-07 11:28 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-15 8:14 [PATCH v6 00/48] TI AM437X ADC1 Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 01/48] clk: ti: am43xx: Add clkctrl data for am43xx ADC1 Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 02/48] dt-bindings: mfd: ti,am3359-tscadc: Add a yaml description for this MFD Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 03/48] dt-bindings: touchscreen: ti,am3359-tsc: New yaml description Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 04/48] dt-bindings: iio: adc: ti,am3359-adc: " Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 05/48] dt-bindings: touchscreen: ti,am3359-tsc: Remove deprecated text file Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 06/48] dt-bindings: mfd: ti,am3359-tscadc: Describe am4372 MFD compatible Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 07/48] dt-bindings: iio: adc: ti,am3359-adc: Describe am4372 ADC compatible Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 08/48] mfd: ti_am335x_tscadc: Ensure a balanced number of node get/put Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 09/48] mfd: ti_am335x_tscadc: Replace license text with SPDX tag Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 10/48] mfd: ti_am335x_tscadc: Fix style Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 11/48] mfd: ti_am335x_tscadc: Drop extra spacing when declaring stack variables Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 12/48] mfd: ti_am335x_tscadc: Get rid of useless gotos Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 13/48] mfd: ti_am335x_tscadc: Reword the comment explaining the dividers Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 14/48] mfd: ti_am335x_tscadc: Don't search the tree for our clock Miquel Raynal
2022-03-04 22:38 ` H. Nikolaus Schaller
2022-03-07 11:10 ` Miquel Raynal [this message]
2022-03-07 11:15 ` H. Nikolaus Schaller
2021-10-15 8:14 ` [PATCH v6 15/48] mfd: ti_am335x_tscadc: Simplify divisor calculation Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 16/48] mfd: ti_am335x_tscadc: Move the driver structure allocation earlier Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 17/48] mfd: ti_am335x_tscadc: Use driver data Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 18/48] mfd: ti_am335x_tscadc: Mimic the probe from resume() Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 19/48] mfd: ti_am335x_tscadc: Drop useless variables from the driver structure Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 20/48] mfd: ti_am335x_tscadc: Always provide an idle configuration Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 21/48] mfd: ti_am335x_tscadc: Reorder the initialization steps Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 22/48] mfd: ti_am335x_tscadc: Gather the ctrl register logic in one place Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 23/48] mfd: ti_am335x_tscadc: Replace the header license text with SPDX tag Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 24/48] mfd: ti_am335x_tscadc: Fix header spacing Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 25/48] mfd: ti_am335x_tscadc: Use the new HZ_PER_MHZ macro Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 26/48] mfd: ti_am335x_tscadc: Drop unused definitions from the header Miquel Raynal
2021-10-15 14:00 ` Jonathan Cameron
2021-10-15 8:14 ` [PATCH v6 27/48] mfd: ti_am335x_tscadc: Use BIT(), GENMASK() and FIELD_PREP() when relevant Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 28/48] mfd: ti_am335x_tscadc: Clarify the maximum values for DT entries Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 29/48] mfd: ti_am335x_tscadc: Drop useless definitions from the header Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 30/48] mfd: ti_am335x_tscadc: Rename the subsystem enable macro Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 31/48] mfd: ti_am335x_tscadc: Add TSC prefix in certain macros Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 32/48] mfd: ti_am335x_tscadc: Rename a variable Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 33/48] mfd: ti_am335x_tscadc: Fix an error message Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 34/48] mfd: ti_am335x_tscadc: Add a boolean to clarify the presence of a touchscreen Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 35/48] mfd: ti_am335x_tscadc: Introduce a helper to deal with the type of hardware Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 36/48] mfd: ti_am335x_tscadc: Add ADC1/magnetic reader support Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 37/48] mfd: ti_am335x_tscadc: Support the correctly spelled DT property Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 38/48] iio: adc: ti_am335x_adc: Wait the idle state to avoid stalls Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 39/48] iio: adc: ti_am335x_adc: Replace license text with SPDX tag Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 40/48] iio: adc: ti_am335x_adc: Fix style Miquel Raynal
2021-10-15 8:14 ` [PATCH v6 41/48] iio: adc: ti_am335x_adc: Get rid of useless gotos Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 42/48] iio: adc: ti_am335x_adc: Gather the checks on the delays Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 43/48] iio: adc: ti_am335x_adc: Add a unit to the timeout delay Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 44/48] iio: adc: ti_am335x_adc: Add the scale information Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 45/48] iio: adc: ti_am335x_adc: Add the am437x compatible Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 46/48] ARM: dts: am437x-cm-t43: Use a correctly spelled DT property Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 47/48] ARM: dts: am43xx: Describe the magnetic reader/ADC1 hardware module Miquel Raynal
2021-10-15 8:15 ` [PATCH v6 48/48] ARM: dts: am437x-gp-evm: enable ADC1 Miquel Raynal
2021-10-20 15:36 ` [PATCH v6 00/48] TI AM437X ADC1 Miquel Raynal
2021-10-20 15:57 ` Lee Jones
2021-10-21 7:45 ` Miquel Raynal
2021-10-21 12:02 ` [GIT PULL] Immutable branch between MFD, IIO, Input (Touchscreen) and Clk due for the v5.16 merge window Lee Jones
2021-10-21 12:13 ` Miquel Raynal
2021-10-21 12:31 ` Lee Jones
2021-10-21 12:41 ` Miquel Raynal
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