From: Tudor Ambarus <tudor.ambarus@linaro.org>
To: Sam Protsenko <semen.protsenko@linaro.org>,
Arnd Bergmann <arnd@arndb.de>
Cc: "Mark Brown" <broonie@kernel.org>,
"Andi Shyti" <andi.shyti@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
krzysztof.kozlowski+dt@linaro.org,
"Conor Dooley" <conor+dt@kernel.org>,
"Alim Akhtar" <alim.akhtar@samsung.com>,
linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Linux-Arch <linux-arch@vger.kernel.org>,
"André Draszik" <andre.draszik@linaro.org>,
"Peter Griffin" <peter.griffin@linaro.org>,
kernel-team@android.com,
"William McVicker" <willmcvicker@google.com>
Subject: Re: [PATCH v2 23/28] spi: s3c64xx: retrieve the FIFO size from the device tree
Date: Mon, 5 Feb 2024 11:54:03 +0200 [thread overview]
Message-ID: <03f335d6-80ed-4dfd-9bc7-c959431c7420@linaro.org> (raw)
In-Reply-To: <CAPLW+4mQ=q1c061Zv=dxnHwMJtjH5sbQsvg25x5uzxL3UCAuTA@mail.gmail.com>
On 26.01.2024 22:20, Sam Protsenko wrote:
> On Fri, Jan 26, 2024 at 2:17 PM Arnd Bergmann <arnd@arndb.de> wrote:
>>
>> On Fri, Jan 26, 2024, at 20:23, Sam Protsenko wrote:
>>> On Thu, Jan 25, 2024 at 11:33 AM Mark Brown <broonie@kernel.org> wrote:
>>>>
>>>> On Thu, Jan 25, 2024 at 02:50:01PM +0000, Tudor Ambarus wrote:
>>>>
>>>>> Allow SoCs that have multiple instances of the SPI IP with different
>>>>> FIFO sizes to specify their FIFO size via the "samsung,spi-fifosize"
>>>>> device tree property. With this we can break the dependency between the
>>>>> SPI alias, the fifo_lvl_mask and the FIFO size.
>>>>
>>>> OK, so we do actually have SoCs with multiple instances of the IP with
>>>> different FIFO depths (and who knows what else other differences)?
>>>
>>> I think that's why we can see .fifo_lvl_mask[] with different values
>>> for different IP instances. For example, ExynosAutoV9 has this (in
>>> upstream driver, yes):
>>>
>>> .fifo_lvl_mask = { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff,
>>> 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
>>>
>>
>> That sounds like the same bug as in the serial port driver,
>> by assuming that the alias values in the devicetree have
>> a particular meaning in identifying instances. This immediately
>> breaks when there is a dtb file that does not use the same
>> alias values, e.g. because it only needs some of the SPI
>> ports.
>>
>
> Exactly. I guess that's exactly what Tudor mentioned in his commit
> message, and he's trying to fix that very problem by relying on
> corresponding dts property (in his patch series) rather than on
> .fifo_lvl_mask.
>
Yes, all from above are correct. I'll split the FIFO size patches into a
smaller series to be easier to review.
Cheers,
ta
next prev parent reply other threads:[~2024-02-05 9:54 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-25 14:49 [PATCH v2 00/28] spi: s3c64xx: winter cleanup and gs101 support Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 01/28] spi: s3c64xx: explicitly include <linux/io.h> Tudor Ambarus
2024-01-25 18:58 ` Sam Protsenko
2024-01-26 14:40 ` Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 02/28] spi: s3c64xx: explicitly include <linux/bits.h> Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 03/28] spi: s3c64xx: avoid possible negative array index Tudor Ambarus
2024-01-25 18:50 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 04/28] spi: dt-bindings: samsung: add google,gs101-spi compatible Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 05/28] spi: dt-bindings: samsung: add samsung,spi-fifosize property Tudor Ambarus
2024-01-25 16:16 ` Mark Brown
2024-01-25 16:38 ` Tudor Ambarus
2024-01-25 17:26 ` Mark Brown
2024-01-25 17:30 ` Tudor Ambarus
2024-01-25 17:45 ` Mark Brown
2024-01-25 19:01 ` Tudor Ambarus
2024-01-30 22:25 ` Rob Herring
2024-02-05 9:42 ` Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 06/28] spi: s3c64xx: sort headers alphabetically Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 07/28] spi: s3c64xx: remove unneeded (void *) casts in of_match_table Tudor Ambarus
2024-01-25 19:04 ` Sam Protsenko
2024-01-26 8:24 ` Tudor Ambarus
2024-01-26 19:40 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 08/28] spi: s3c64xx: remove else after return Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 09/28] spi: s3c64xx: use bitfield access macros Tudor Ambarus
2024-01-25 19:50 ` Sam Protsenko
2024-01-26 8:49 ` Tudor Ambarus
2024-01-26 19:55 ` Sam Protsenko
2024-01-26 16:01 ` Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 10/28] spi: s3c64xx: use full mask for {RX, TX}_FIFO_LVL Tudor Ambarus
2024-01-25 20:03 ` Sam Protsenko
2024-01-25 21:48 ` Mark Brown
2024-01-26 8:51 ` Tudor Ambarus
2024-01-26 8:12 ` Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 11/28] spi: s3c64xx: move common code outside if else Tudor Ambarus
2024-01-25 20:09 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 12/28] spi: s3c64xx: check return code of dmaengine_slave_config() Tudor Ambarus
2024-01-25 20:19 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 13/28] spi: s3c64xx: propagate the dma_submit_error() error code Tudor Ambarus
2024-01-25 20:23 ` Sam Protsenko
2024-01-26 7:42 ` Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 14/28] spi: s3c64xx: rename prepare_dma() to s3c64xx_prepare_dma() Tudor Ambarus
2024-01-25 20:24 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 15/28] spi: s3c64xx: return ETIMEDOUT for wait_for_completion_timeout() Tudor Ambarus
2024-01-25 20:30 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 16/28] spi: s3c64xx: simplify s3c64xx_wait_for_pio() Tudor Ambarus
2024-01-25 20:43 ` Sam Protsenko
2024-01-26 7:56 ` Tudor Ambarus
2024-01-26 19:31 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 17/28] spi: s3c64xx: drop blank line between declarations Tudor Ambarus
2024-01-25 20:38 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 18/28] spi: s3c64xx: fix typo, s/configuartion/configuration Tudor Ambarus
2024-01-25 20:39 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 19/28] spi: s3c64xx: downgrade dev_warn to dev_dbg for optional dt props Tudor Ambarus
2024-01-25 20:40 ` Sam Protsenko
2024-01-25 14:49 ` [PATCH v2 20/28] spi: s3c64xx: add support for inferring fifosize from the compatible Tudor Ambarus
2024-01-25 14:49 ` [PATCH v2 21/28] spi: s3c64xx: infer " Tudor Ambarus
2024-01-25 17:18 ` Mark Brown
2024-01-25 18:44 ` Tudor Ambarus
2024-01-25 22:28 ` Sam Protsenko
2024-01-26 7:27 ` Tudor Ambarus
2024-01-25 14:50 ` [PATCH v2 22/28] spi: s3c64xx: drop dependency on of_alias where possible Tudor Ambarus
2024-01-25 14:50 ` [PATCH v2 23/28] spi: s3c64xx: retrieve the FIFO size from the device tree Tudor Ambarus
2024-01-25 17:33 ` Mark Brown
2024-01-26 19:23 ` Sam Protsenko
2024-01-26 20:16 ` Arnd Bergmann
2024-01-26 20:20 ` Sam Protsenko
2024-02-05 9:54 ` Tudor Ambarus [this message]
2024-01-26 21:19 ` Mark Brown
2024-01-25 14:50 ` [PATCH v2 24/28] spi: s3c64xx: mark fifo_lvl_mask as deprecated Tudor Ambarus
2024-01-25 14:50 ` [PATCH v2 25/28] asm-generic/io.h: add iowrite{8,16}_32 accessors Tudor Ambarus
2024-01-25 17:41 ` Mark Brown
2024-01-25 21:23 ` Arnd Bergmann
2024-01-26 7:21 ` Tudor Ambarus
2024-01-25 14:50 ` [PATCH v2 26/28] spi: s3c64xx: add iowrite{8,16}_32_rep accessors Tudor Ambarus
2024-01-25 14:50 ` [PATCH v2 27/28] spi: s3c64xx: add support for google,gs101-spi Tudor Ambarus
2024-01-25 20:45 ` Sam Protsenko
2024-01-25 14:50 ` [PATCH v2 28/28] MAINTAINERS: add Tudor Ambarus as R for the samsung SPI driver Tudor Ambarus
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