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Newbie Question: Clarifying I2C Master/Slave roles and device tree binding for client hardware info
by William Torrez Corea May 18, 2026

May 18, 2026

The documentation is incomplete and inexact. -- With kindest regards, William. *Larry Wall invented a messy programming language -- and changed the face of the Web*

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Newbie Question: Clarifying I2C Master/Slave roles and device tree binding for client hardware info
by Momin M May 9, 2026

May 9, 2026

Hi all, I have been reading the I2C kernel documentation, and I understand the basic principles of SDA/SCL. I am now trying to grasp the kernel-side implementation. I'm struggling with two interconnected points regarding driver development: 1. *Master/Slave Abstraction:* How are the concepts of I2C "Master" and "Slave" represented in Linux kernel drivers? Specifically, is the i2c_adapter always considered the "master" (the controller that initiates transactions), and the i2c_client always considered the "slave" (the device being accessed), or are there contexts where this simple analogy breaks down (e.g., multi-master environments or slave-mode drivers)? 2. *Client Hardware Information:* I'm trying to understand the minimum necessary hardware information required for the i2c_client to probe successfully. Beyond the reg property (slave address) and a compatible string in the Device Tree, what other information, if any, is crucial for correctly instantiating the client device, especially for a standard, non-complex sensor? Any guidance on tracing this abstraction back to the low-level register/hardware interaction would be greatly appreciated. Thanks, Momin M

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Upstreaming - how to deal with vendor fork
by Patryk May 1, 2026

May 1, 2026

Hi Some time ago I managed to upstream one bugfix, now I have more changes but I'm wondering how to approach this. Suppose that I have found a bug and prepared a fix. However, the bug and its solution has been found and tested on a custom board that is equipped with a particular buggy device. The problem is that I cannot simply use mainline/maintainer tree, build it, and run on my board as these source trees do not have support for my board, as I use SoC vendor fork (v6.12) supplied with their bsp with patches that add support for my board. It's not mine decision - obviously - me and my team would be very willing to use mainline but it would require some effort, time and obviously we would not get vendor support in case of some bugs (it happened mamy times). I can of course take the minimal set of patches for out board and apply them over mainline but e.g. now I have a bugfix for mainline driver...but in order to fully test it I need vendor changes as they did not upstream it yet. So at the end in order to test a bugfix on the mainline I would need to apply patches that add support for my board as well patches from vendor fork that add support for the rest of the functionality (not yet upstreamed by vendor) that I need in order to test the bugfix. Any sugestion on how to approach this? I have already few changes that could be applied to mainline but due to what I described above they're just waiting... Will be grateful for some sugestion. Best regards Patryk

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Kernel test
by David Lishchyshen March 1, 2026

March 1, 2026

How you recommend to test kernel? I use Arch and found 3 ways: * Native run, replace existing kernel * Qemu with full Linux distribution, install Ubuntu in qemu and replace kernel in it * Minimal Qemu, need to create initramfs with busybox and connect to Qemu with your kernel, but I even couldn't see printk log from e1000e in this way Thanks, David

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Re: संदर्भ: Fwd: Custom email
by David Lishchyshen Feb. 28, 2026

Feb. 28, 2026

Tue, 24 Feb. 2026 р. 10:03 Siddh Raman Pant <sanganaka(a)siddh.me> wrote: > > Tue, 24 Feb 2026 13:24:32 +0530 को david(a)daika.dev ने लिखा - > > I have email on my own domain but I send mail from gmail smtp. If I > > send a patch from it, will it be applied or gone to spam? > > What do you mean? > > Gmail SMTP would be for gmail hosted emails. > > Anyways, to ensure delivery to inbox, make sure > SPF/DKIM/DMARC pass in usual cases. > > Basically, good mail-related DNS settings. > > And of course, no actual spam! :P > > Thanks, > Siddh I made a workaround, so to speak. I set up email forwarding from my domain to Gmail, and added custom email as an alias with the Gmail SMTP server in Gmail. It works, but when I look at my emails in another Gmail account, I see the note “via gmail.com” and the field “mailed-by:gmail.com.” By the way, I'm sending this email in this way. Thanks, David

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Mailing list for a question related to ethernet phy
by Patryk Feb. 25, 2026

Feb. 25, 2026

Hello I'm wondering what would be the best mailing list to ask a question related to 10G QXGMII ethernet PHY? I've been facing some problems during the phy bring-up and would like to consult with someone that has far more experience than me. Best regards Patryk

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Re: संदर्भ: Fwd: Custom email
by David Lishchyshen Feb. 24, 2026

Feb. 24, 2026

> > ---- Tue, 24 Feb 2026 13:54:11 +0530 को david(a)daika.dev ने लिखा ---- > > > > Tue, 24 Feb. 2026 р. 10:03 Siddh Raman Pant > > wrote: > > > > > > Tue, 24 Feb 2026 13:24:32 +0530 को david@daika.dev[mailto:david@daika.dev] > > ने लिखा - > > I made a workaround, so to speak. I set up email forwarding from my > > domain to Gmail, and added custom email as an alias with the Gmail > > SMTP server in Gmail. It works, but when I look at my emails in > > another Gmail account, I see the note “via gmail.com” and the field > > “mailed-by:gmail.com.” > > > > By the way, I'm sending this email in this way. > > > > Thanks, > > David > > > Don't do this, I am seeing a big warning in my email client recommending me to block you. > > > Just setup a proper mail service. Look at Zoho. > > > Thanks, > Siddh Thanks for the advice. Can I ask if it's free? And to be honest, I'm not really keen on giving everyone my phone number (I mean Zoho) :P I also tried Resend, but emails from it went straight to spam. I have VPS on Azure, but they block outgoing traffic on port 25. What if I try to bypass this using the same Cloudflare Warp? Although, how do I configure SPF then...? Thanks, David

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Fwd: Custom email
by David Lishchyshen Feb. 24, 2026

Feb. 24, 2026

I have joined the mail list, so I resend it, sorry. --- I have email on my own domain but I send mail from gmail smtp. If I send a patch from it, will it be applied or gone to spam?

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None
by Syed Kumail Hussain Sherazi Jan. 27, 2026

Jan. 27, 2026

Hi everyone, I'm working on a simple kernel module to get an idea of platform drivers and devices. I created a dtbo for my board (Beaglebone Black) and loaded it. When I install my kernel module with insmod I get an error from the pinmuxing driver. Here is the relevant dmesg output: [10971.691781] gpio_platform_drv: loading out-of-tree module taints kernel. [10971.699577] pinctrl-single 44e10800.pinmux: Invalid number of rows: 0 [10971.708571] pinctrl-single 44e10800.pinmux: no pins entries for gpio-irq-pin C code for the kernel module is at this link: https://hastebin.com/share/ejimanodir.cpp And the dtbo source is at this link: https://hastebin.com/share/xasizepicu.javascript I assume the issue is with the dtbo but I might be wrong. Any help might be appreciated. Thanks, Syed Kumail

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Re: Query: Y2038 patch series for 3.18 Kernel
by Arnd Bergmann Jan. 20, 2026

Jan. 20, 2026

On Tue, Jan 20, 2026, at 02:05, syrus wrote: > From: [Syrus] <[syrus.lssu(a)ingenic.com]> > > Hi Arnd, all, > > Thanks for the discussion. While kernel upgrade solves Y2038 for new > projects, our legacy devices on 3.10.14 kernel face upgrade challenges > due to driver compatibility and limited resources (limited manpower, > communication barriers between different departments and companies, etc.). > > Has anyone successfully backported Y2038 fixes to older kernels like > 3.10.x? I'm looking for patch summaries or experiences with such > backports, or at least a summary of the commit history that addresses > this issue. Any guidance on key subsystems to focus on would be very > helpful for maintaining our legacy devices. Hi Syrus, As I replied earlier, anything older than 5.4 has pretty much no chance of getting the kernel backports. If you are specifically working on Ingenic's own SoC support, I do think that you are in luck as these seem to be fairly well supported in recent kernels, based on the work that Paul Cercueil has done over the years, at least for the chips that ended up in popular development boards and gaming handhelds (jz4725, jz4740, jz4760, jz4770). If there are specific drivers that are not yet supported upstream but work on the patched 3.10 kernel, I'm sure you can find consulting companies that are able to port those drivers as well. Arnd

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