linux-kernel - Re: [PATCH v2 05/28] spi: dt-bindings: samsung: add samsung,spi-fifosize property

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Message-ID: <f2ec664b-cd67-4cae-9c0d-5a435c72f121@linaro.org>
Date: Thu, 25 Jan 2024 17:30:53 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Mark Brown <broonie@...nel.org>
Cc: andi.shyti@...nel.org, arnd@...db.de, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 alim.akhtar@...sung.com, linux-spi@...r.kernel.org,
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-arch@...r.kernel.org, andre.draszik@...aro.org,
 peter.griffin@...aro.org, semen.protsenko@...aro.org,
 kernel-team@...roid.com, willmcvicker@...gle.com
Subject: Re: [PATCH v2 05/28] spi: dt-bindings: samsung: add
 samsung,spi-fifosize property



On 1/25/24 17:26, Mark Brown wrote:
> On Thu, Jan 25, 2024 at 04:38:07PM +0000, Tudor Ambarus wrote:
>> On 1/25/24 16:16, Mark Brown wrote:
> 
>>> Do we have any cases where we'd ever want to vary this independently of
>>> the SoC - this isn't a configurable IP shipped to random integrators?
> 
>> The IP supports FIFO depths from 8 to 256 bytes (in powers of 2 I
>> guess). The integrator is the one dictating the IP configuration. In
>> gs101's case all USIxx_USI (which includes SPI, I2C, and UART) are
>> configured with 64 bytes FIFO depths.
> 
> OK, so just the compatible is enough information then?

For gs101, yes. All the gs101 SPI instances are configured with 64 bytes
FIFO depths. So instead of specifying the FIFO depth for each SPI node,
we can infer the FIFO depth from the compatible.