linux-kernel - Re: [PATCH 4/5] spi: uniphier: Add SPI

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Date:   Thu, 26 Dec 2019 10:55:36 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Keiji Hayashibara <hayashibara.keiji@...ionext.com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH 4/5] spi: uniphier: Add SPI_LOOP to the capabilities

Hi Mark,
Thanks for your comment.

On Wed, 25 Dec 2019 18:01:42 +0000 <broonie@...nel.org> wrote:
> On Tue, Dec 24, 2019 at 09:58:26AM +0900, Kunihiko Hayashi wrote:
> > Add SPI_LOOP to the capabilities to support loopback mode.
> 
> >  	master->min_speed_hz = DIV_ROUND_UP(clk_rate, SSI_MAX_CLK_DIVIDER);
> > -	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
> > +	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |
> > +			    SPI_LOOP;
> 
> I'd expect to see a matching change that configures the hardware
> in loopback mode when the driver is in SPI_MODE?  There's nothing
> in the existing driver.

I see. When doing loopback test using spi-loopback-test.c, I thought
'loop_req=1' option was needed, however, the controller doesn't need it.
We can ignore this patch.

Thank you,

---
Best Regards,
Kunihiko Hayashi