linux-kernel - Re: [PATCH] spi: bcm63xx-hsspi: add support for 1-2-2 read ops

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Message-ID: <CAA_RMS4-U4kz7JVvB-N4B9RCK3Rh=9E-o0LctOsr-O7OEv19Zw@mail.gmail.com>
Date: Mon, 22 Dec 2025 18:49:10 -0800
From: David Regan <dregan@...adcom.com>
To: Jonas Gorski <jonas.gorski@...il.com>
Cc: Kursad Oney <kursad.oney@...adcom.com>, William Zhang <william.zhang@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Mark Brown <broonie@...nel.org>, 
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	David Regan <dregan@...adcom.com>, dregan@...l.com
Subject: Re: [PATCH] spi: bcm63xx-hsspi: add support for 1-2-2 read ops

Hi Jonas,

On Mon, Dec 22, 2025 at 6:30 PM William Zhang
<william.zhang@...adcom.com> wrote:
>
> Hi Jonas,
>
> On Wed, Dec 17, 2025 at 1:10 PM Jonas Gorski <jonas.gorski@...il.com> wrote:
> >
> > Add support for 1-2-2 read ops by separately calculating the switch from
> > single-bit to multi-bit, and then switching within the prepend data.
> >
> > This allows us to support single-bit write followed by multi-bit write
> > followed by multi-bit read, and we do not need to reject 1-2-2 read
> > operations anymore.
> >
> > Tested on BCM963268BU_P300 with custom fixup to allow 1-2-2 on the
> > non-SDFP capable s25fl129p1 attached (which it actually supports):
> >
...
> > 2.43.0
> >
>
> Acked-by: William Zhang <william.zhang@...adcom.com>

Tested-by: David Regan <dregan@...adcom.com>