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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "Michael Walle" <mwalle@kernel.org>
Cc: "Santhosh Kumar K" <s-k6@ti.com>,  <broonie@kernel.org>,
	<robh@kernel.org>,  <krzk+dt@kernel.org>,  <conor+dt@kernel.org>,
	<richard@nod.at>,  <vigneshr@ti.com>,  <tudor.ambarus@linaro.org>,
	<pratyush@kernel.org>,  <linux-spi@vger.kernel.org>,
	<devicetree@vger.kernel.org>,  <linux-kernel@vger.kernel.org>,
	<linux-mtd@lists.infradead.org>,  <praneeth@ti.com>,
	 <u-kumar1@ti.com>, <p-mantena@ti.com>,  <a-dutta@ti.com>
Subject: Re: [RFC PATCH v2 09/12] spi: cadence-quadspi: add PHY tuning infrastructure
Date: Thu, 12 Feb 2026 13:55:22 +0100	[thread overview]
Message-ID: <87fr76xgsl.fsf@bootlin.com> (raw)
In-Reply-To: <DGCXTWSCAH6R.22SIL82AUVGYI@kernel.org> (Michael Walle's message of "Thu, 12 Feb 2026 12:14:05 +0100")

Hello,

>>>> +	for_each_child_of_node(partition_np, part_np) {
>>>> +		if (of_property_read_string(part_np, "label", &label) ||
>>>> +		    !strstr(label, "phypattern"))
>>>> +			continue;
>>>
>>> There was already a review comment on the last version. Moving this
>>> into the driver doesn't make it any better. In fact this might
>>> create a (bad) precedent for future drivers.
>>
>> I remember complaining about it but not if there was a solution
>> foreseen. In SPI NAND the solution has been found: the pattern is in the
>> driver and we load it into cache before PHY tuning. But for SPI NOR I
>> understood this wasn't possible. What would be an alternative?
>
> I'm not complaining about using a partition for the pattern but
> about the hardcoded name of it.
>
> It was proposed to use at least a device tree phandle to point to a
> partition (or so).

Ah, yes indeed, thanks for clarifying this up (again) for me. I also
agree the hardcoded name is not ideal.

Thanks,
Miquèl

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WARNING: multiple messages have this Message-ID (diff)
From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "Michael Walle" <mwalle@kernel.org>
Cc: "Santhosh Kumar K" <s-k6@ti.com>,  <broonie@kernel.org>,
	<robh@kernel.org>,  <krzk+dt@kernel.org>,  <conor+dt@kernel.org>,
	<richard@nod.at>,  <vigneshr@ti.com>,  <tudor.ambarus@linaro.org>,
	<pratyush@kernel.org>,  <linux-spi@vger.kernel.org>,
	<devicetree@vger.kernel.org>,  <linux-kernel@vger.kernel.org>,
	<linux-mtd@lists.infradead.org>,  <praneeth@ti.com>,
	 <u-kumar1@ti.com>, <p-mantena@ti.com>,  <a-dutta@ti.com>
Subject: Re: [RFC PATCH v2 09/12] spi: cadence-quadspi: add PHY tuning infrastructure
Date: Thu, 12 Feb 2026 13:55:22 +0100	[thread overview]
Message-ID: <87fr76xgsl.fsf@bootlin.com> (raw)
In-Reply-To: <DGCXTWSCAH6R.22SIL82AUVGYI@kernel.org> (Michael Walle's message of "Thu, 12 Feb 2026 12:14:05 +0100")

Hello,

>>>> +	for_each_child_of_node(partition_np, part_np) {
>>>> +		if (of_property_read_string(part_np, "label", &label) ||
>>>> +		    !strstr(label, "phypattern"))
>>>> +			continue;
>>>
>>> There was already a review comment on the last version. Moving this
>>> into the driver doesn't make it any better. In fact this might
>>> create a (bad) precedent for future drivers.
>>
>> I remember complaining about it but not if there was a solution
>> foreseen. In SPI NAND the solution has been found: the pattern is in the
>> driver and we load it into cache before PHY tuning. But for SPI NOR I
>> understood this wasn't possible. What would be an alternative?
>
> I'm not complaining about using a partition for the pattern but
> about the hardcoded name of it.
>
> It was proposed to use at least a device tree phandle to point to a
> partition (or so).

Ah, yes indeed, thanks for clarifying this up (again) for me. I also
agree the hardcoded name is not ideal.

Thanks,
Miquèl

  reply	other threads:[~2026-02-12 13:03 UTC|newest]

Thread overview: 94+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-13 14:16 [RFC PATCH v2 00/12] spi: cadence-quadspi: add PHY tuning support Santhosh Kumar K
2026-01-13 14:16 ` Santhosh Kumar K
2026-01-13 14:16 ` [RFC PATCH v2 01/12] spi: dt-bindings: add spi-has-dqs property Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-04 10:46   ` Miquel Raynal
2026-02-04 10:46     ` Miquel Raynal
2026-02-05 17:46     ` Santhosh Kumar K
2026-02-05 17:46       ` Santhosh Kumar K
2026-02-05 18:06       ` Miquel Raynal
2026-02-05 18:06         ` Miquel Raynal
2026-01-13 14:16 ` [RFC PATCH v2 02/12] spi: spi-mem: add controller tuning support Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-01-13 14:16 ` [RFC PATCH v2 03/12] mtd: spinand: perform controller tuning during probe Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:35   ` Miquel Raynal
2026-02-05 17:35     ` Miquel Raynal
2026-02-06 19:23     ` Santhosh Kumar K
2026-02-06 19:23       ` Santhosh Kumar K
2026-01-13 14:16 ` [RFC PATCH v2 04/12] mtd: spi-nor: extract read operation setup into helper Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-01-13 14:16 ` [RFC PATCH v2 05/12] mtd: spi-nor: perform controller tuning during probe Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-01-13 14:16 ` [RFC PATCH v2 06/12] spi: cadence-quadspi: move cqspi_readdata_capture earlier Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:35   ` Miquel Raynal
2026-02-05 17:35     ` Miquel Raynal
2026-01-13 14:16 ` [RFC PATCH v2 07/12] spi: cadence-quadspi: add DQS support to read data capture Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:35   ` Miquel Raynal
2026-02-05 17:35     ` Miquel Raynal
2026-01-13 14:16 ` [RFC PATCH v2 08/12] spi: cadence-quadspi: read 'has-dqs' DT property Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:35   ` Miquel Raynal
2026-02-05 17:35     ` Miquel Raynal
2026-02-19 12:14     ` Michael Walle
2026-02-19 12:14       ` Michael Walle
2026-02-20  8:21       ` Miquel Raynal
2026-02-20  8:21         ` Miquel Raynal
2026-01-13 14:16 ` [RFC PATCH v2 09/12] spi: cadence-quadspi: add PHY tuning infrastructure Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:39   ` Miquel Raynal
2026-02-05 17:39     ` Miquel Raynal
2026-02-06 19:25     ` Santhosh Kumar K
2026-02-06 19:25       ` Santhosh Kumar K
2026-02-13  8:18       ` Miquel Raynal
2026-02-13  8:18         ` Miquel Raynal
2026-02-18 18:07         ` Santhosh Kumar K
2026-02-18 18:07           ` Santhosh Kumar K
2026-02-19 10:30           ` Miquel Raynal
2026-02-19 10:30             ` Miquel Raynal
2026-02-09  9:48   ` Michael Walle
2026-02-09  9:48     ` Michael Walle
2026-02-12 10:50     ` Miquel Raynal
2026-02-12 10:50       ` Miquel Raynal
2026-02-12 11:14       ` Michael Walle
2026-02-12 11:14         ` Michael Walle
2026-02-12 12:55         ` Miquel Raynal [this message]
2026-02-12 12:55           ` Miquel Raynal
2026-02-18 18:07           ` Santhosh Kumar K
2026-02-18 18:07             ` Santhosh Kumar K
2026-02-19  8:33             ` Michael Walle
2026-02-19  8:33               ` Michael Walle
2026-02-19 10:34             ` Miquel Raynal
2026-02-19 10:34               ` Miquel Raynal
2026-01-13 14:16 ` [RFC PATCH v2 10/12] spi: cadence-quadspi: implement PHY tuning algorithm Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:42   ` Miquel Raynal
2026-02-05 17:42     ` Miquel Raynal
2026-01-13 14:16 ` [RFC PATCH v2 11/12] spi: cadence-quadspi: restrict PHY frequency to tuned operations Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:47   ` Miquel Raynal
2026-02-05 17:47     ` Miquel Raynal
2026-02-06 19:27     ` Santhosh Kumar K
2026-02-06 19:27       ` Santhosh Kumar K
2026-02-13  8:21       ` Miquel Raynal
2026-02-13  8:21         ` Miquel Raynal
2026-03-17 15:17         ` Miquel Raynal
2026-03-17 15:17           ` Miquel Raynal
2026-03-30 19:56           ` Santhosh Kumar K
2026-03-30 19:56             ` Santhosh Kumar K
2026-01-13 14:16 ` [RFC PATCH v2 12/12] spi: cadence-quadspi: enable PHY for direct reads and writes Santhosh Kumar K
2026-01-13 14:16   ` Santhosh Kumar K
2026-02-05 17:51   ` Miquel Raynal
2026-02-05 17:51     ` Miquel Raynal
2026-02-04 10:29 ` [RFC PATCH v2 00/12] spi: cadence-quadspi: add PHY tuning support Miquel Raynal
2026-02-04 10:29   ` Miquel Raynal
2026-02-05 15:48   ` Miquel Raynal
2026-02-05 15:48     ` Miquel Raynal
2026-02-06 19:28     ` Santhosh Kumar K
2026-02-06 19:28       ` Santhosh Kumar K
2026-02-13  9:01       ` Miquel Raynal
2026-02-13  9:01         ` Miquel Raynal
2026-02-18 18:08         ` Santhosh Kumar K
2026-02-18 18:08           ` Santhosh Kumar K

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