linux-kernel - Re: [PATCH net-next v1] net: phy: spi_ks8995: Do not overwrite SPI mode flags

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Date:   Mon, 9 Nov 2020 14:56:38 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v1] net: phy: spi_ks8995: Do not overwrite SPI
 mode flags

On Mon, Nov 9, 2020 at 2:49 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> Did you check to see if there is a help to set just the mode without
> changing any of the other bits?

Absolutely, but it doesn't exist, AFAIK.

It would be great if client spi drivers would use a helper function like
that. The spi bus driver on my platform (imx ecspi) was recently changed
upstream, which means SPI_CS_HIGH is now always set, irrespective
of the actual chip select polarity. This change breaks every single spi
driver which "plows over" the spi->mode flags. And there are quite
a few...

Sven