linux-kernel - Re: [PATCH v2 2/3] spi: dw-mmio: update dw_spi_mmio_of

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Date: Mon, 1 Jul 2024 21:57:20 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Samuel Holland <samuel.holland@...ive.com>, 
	Kanak Shilledar <kanakshilledar@...il.com>, Conor Dooley <conor+dt@...nel.org>, 
	Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: Kanak Shilledar <kanakshilledar@...il.com>, 
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jisheng Zhang <jszhang@...nel.org>, Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, linux-spi@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] spi: dw-mmio: update dw_spi_mmio_of_match struct
 with thead

Hi folks

On Mon, Jul 01, 2024 at 08:17:29AM -0500, Samuel Holland wrote:
> Hi Kanak,
> 
> On 2024-07-01 7:13 AM, Kanak Shilledar wrote:
> > updated the struct of_device_id dw_spi_mmio_of_match to include
> > the updated compatible value for TH1520 SoC ("thead,th1520-spi")
> > to initialize with dw_spi_pssi_init().
> > 
> > Signed-off-by: Kanak Shilledar <kanakshilledar@...il.com>
> > ---
> > Changes in v2:
> > - Separated from a single patch file.
> > ---
> >  drivers/spi/spi-dw-mmio.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
> > index 819907e332c4..39e3d46ebf5d 100644
> > --- a/drivers/spi/spi-dw-mmio.c
> > +++ b/drivers/spi/spi-dw-mmio.c
> > @@ -419,6 +419,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = {
> >  	{ .compatible = "microchip,sparx5-spi", dw_spi_mscc_sparx5_init},
> >  	{ .compatible = "canaan,k210-spi", dw_spi_canaan_k210_init},
> >  	{ .compatible = "amd,pensando-elba-spi", .data = dw_spi_elba_init},
> > +	{ .compatible = "thead,th1520-spi", .data = dw_spi_pssi_init},
> 
> Your binding requires snps,dw-apb-ssi as a fallback compatible string, which is
> already supported by this driver and uses the same match data. So you don't need
> this patch; its only effect is to make the kernel larger.

Agree with Samuel comment. Indeed there is no point in adding the
vendor-specific device-name supported in the driver if the fallback
compatible works as-is.

>From that perspective we shouldn't have merged in the patch adding the
Renesas RZN1 SPI device name support, since the generic fallback
compatible works for it. On the contrary the Microsemi Ocelot/Jaguar2
SoC SPI DT-bindings shouldn't have been defined with the generic
fallback compatible since should the device be bound via the generic
name it won't work as expected.

Although, it's better to hear out what Rob, Conor or Krzysztof think
about this.

-Serge(y)

> 
> Regards,
> Samuel
> 
> >  	{ /* end of table */}
> >  };
> >  MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
>