linux-kernel - SPI not working on 5.10 and 5.11, bisected to 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors")

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Date:   Wed, 13 Jan 2021 09:49:12 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Sven Van Asbroeck <thesven73@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-spi <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>
Subject: SPI not working on 5.10 and 5.11, bisected to 766c6b63aa04 ("spi: fix
 client driver breakages when using GPIO descriptors")

Hello,

My board has powerpc 885 microcontroler. Temperature sensor is an LM74.

Kernel has CONFIG_SPI_FSL_SPI and CONFIG_SPI_FSL_CPM and CONFIG_SENSORS_LM70.

Since kernel 5.10, 'sensors' reports temperature 0°C on my board:

	root@...ip:~# sensors

	lm74-spi-0-5
	Adapter: SPI adapter
	temp1:         +0.0 C

	lm74-spi-0-1
	Adapter: SPI adapter
	temp1:         +0.0 C

With commit 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors") reverted, 
it is back to work:

	root@...ip:~# sensors

	lm74-spi-0-5
	Adapter: SPI adapter
	temp1:        +38.9 C

	lm74-spi-0-1
	Adapter: SPI adapter
	temp1:        +37.2 C


What shall I do ?

Thanks
Christophe