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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250507_065625_179648_9D1A3654 X-CRM114-Status: GOOD ( 31.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 07/05/2025 14:28, Ioana Ciornei wrote: > On Wed, May 07, 2025 at 06:54:38AM +0200, Krzysztof Kozlowski wrote: >> On 06/05/2025 16:21, Ioana Ciornei wrote: >>> On Fri, May 02, 2025 at 09:04:03AM +0200, Krzysztof Kozlowski wrote: >>>> On Wed, Apr 30, 2025 at 06:36:33PM GMT, Ioana Ciornei wrote: >>>>> From: Vladimir Oltean >>>>> >>>>> The MDIO mux on the LS1028A-QDS never worked in mainline. The device >>>>> tree was submitted as-is, and there is a downstream driver for the QIXIS >>>>> FPGA: >>>>> >>>>> https://github.com/nxp-qoriq/linux/blob/lf-6.12.y/drivers/soc/fsl/qixis_ctrl.c >>>>> >>>>> That driver is very similar to the already existing drivers/mfd/simple-mfd-i2c.c, >>>>> and the hardware works with the simple-mfd-i2c driver, so there isn't >>>>> any reason to upstream the other one. >>>>> >>>>> Adapt the compatible string and child node format of the FPGA node, so >>>>> that the simple-mfd-i2c driver accepts it. >>>> >>>> Why do you break the users based on some driver differences? Fix the >>>> drivers, not the DTS. >>>> >>>>> >>>>> Signed-off-by: Vladimir Oltean >>>>> Signed-off-by: Ioana Ciornei >>>>> --- >>>>> arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts | 9 +++++---- >>>>> 1 file changed, 5 insertions(+), 4 deletions(-) >>>>> >>>>> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts b/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts >>>>> index 0bb2f28a0441..58b54d521d75 100644 >>>>> --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts >>>>> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts >>>>> @@ -338,17 +338,18 @@ sgtl5000: audio-codec@a { >>>>> }; >>>>> >>>>> fpga@66 { >>>>> - compatible = "fsl,ls1028aqds-fpga", "fsl,fpga-qixis-i2c", >>>>> - "simple-mfd"; >>>>> + compatible = "fsl,ls1028a-qds-qixis-i2c"; >>>> >>>> This breaks all the existing users. NAK. >>> >>> Using a mainline kernel, this DT node was never used or probed by a >>> driver since that driver was never submitted. I am not breaking any user >>> of the mainline kernel. >> 1. Users of DTS is plural, so what about all other projects and out of >> tree users? You still can have users in all possible projects. Dropping simple-mfd, even though it is Linux thingy, is affecting users, potentially breaking them. Exactly what we talked on last plumbers - don't do such changes. I recall even warning from Rob for people adding simple-mfd: be careful adding it, because dropping it creates compatibility issue. This is not a fresh platform, where you do not care about users. It is published to all users since ~2019. >> 2. Did you remove simple-mfd from kernel or what? How can you claim >> there is no driver for simple-mfd? > > No, I did not remove simple-mfd from the kernel. > ... > If, as you say, this works just by having the simple-mfd, I should have > been able to see the enetc_port1 functional and the RGMII PHY be > accesible on the MDIO bus which is behind the reg-mux. But this is not > happening. > > Instead, I get this: > > [ 17.635216] platform mdio-mux: deferred probe pending: mdio-mux-multiplexer: Failed to get mux > > root@localhost:~# ip link set dev eno1 up > [ 1155.190391] net eno1: could not attach to PHY > root@localhost:~# uname -a > Linux localhost 6.15.0-rc5-next-20250507 #112 SMP PREEMPT Wed May 7 15:21:14 EEST 2025 aarch64 aarch64 aarch64 GNU/Linux > > From what I understand, even though the fpga@66 has the simple-mfd > compatible, no entity initializes an I2C regmap (since this is an I2C > device) for it so that it can be used by any child device. > This sounds reasonable, thanks for providing context. Most of this (so a summary) should be in the commit msg as the rationale for changing the ABI, so please grow a bit the commit msg part: "The MDIO mux on the LS1028A-QDS never worked in mainline because ...". With all this I still do not get why do you need to affect the compatibles. What is wrong with the actual compatibles? Best regards, Krzysztof