linux-kernel - Re: [PATCH v3 1/3] dt-bindings: i2c: Add RTL9300 I2C controller

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4a0dbf45-3f27-43d4-87c6-35b1983ceaef@alliedtelesis.co.nz>
Date: Tue, 24 Sep 2024 21:11:13 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: "andi.shyti@...nel.org" <andi.shyti@...nel.org>, "robh@...nel.org"
	<robh@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "tsbogend@...ha.franken.de"
	<tsbogend@...ha.franken.de>, "linux-i2c@...r.kernel.org"
	<linux-i2c@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mips@...r.kernel.org"
	<linux-mips@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] dt-bindings: i2c: Add RTL9300 I2C controller


On 24/09/24 20:55, Krzysztof Kozlowski wrote:
> On Tue, Sep 24, 2024 at 11:02:28AM +1200, Chris Packham wrote:
>> Add dtschema for the I2C controller on the RTL9300 SoC. The I2C
>> controllers on this SoC are part of the "switch" block which is
>> represented here as a syscon node. The SCL pins are dependent on the I2C
>> controller (GPIO8 for the first controller, GPIO 17 for the second). The
>> SDA pins can be assigned to either one of the I2C controllers (but not
>> both).
>>
>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>> ---
>>
>> Notes:
>>      Changes in v3:
>>      - Remove parent node in example
>>      - put unevaluatedProperties after required
>>      - Add #address-cells and #size-cells
>>      
>>      Changes in v2:
>>      - Use reg property for controller registers
>>      - Remove global-control-offset (will be hard coded in driver)
>>      - Integrated the multiplexing function. Child nodes now represent the
>>        available SDA lines
>>
>>   .../bindings/i2c/realtek,rtl9300-i2c.yaml     | 80 +++++++++++++++++++
>>   MAINTAINERS                                   |  6 ++
>>   2 files changed, 86 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml b/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml
>> new file mode 100644
>> index 000000000000..979ec22e81f1
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml
>> @@ -0,0 +1,80 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://scanmail.trustwave.com/?c=20988&d=gf7y5rgy9ER44HZptkkovLbVGtkYd7ByAz3K6PNPAw&u=http%3a%2f%2fdevicetree%2eorg%2fschemas%2fi2c%2frealtek%2crtl9300-i2c%2eyaml%23
>> +$schema: http://scanmail.trustwave.com/?c=20988&d=gf7y5rgy9ER44HZptkkovLbVGtkYd7ByA2-a7KJKBg&u=http%3a%2f%2fdevicetree%2eorg%2fmeta-schemas%2fcore%2eyaml%23
>> +
>> +title: Realtek RTL I2C Controller
>> +
>> +maintainers:
>> +  - Chris Packham <chris.packham@...iedtelesis.co.nz>
>> +
>> +description:
>> +  The RTL9300 SoC has two I2C controllers. Each of these has an SCL line (which
> This is confusing. It took me some minutes to understand that two I2Cs
> in the example do not match what you wrote here. I got there only because
> of your DTS. Your patchsets - sent separately and describing problem
> incompletely - do not help.
>
> This is the binding for I2C, not for RTL9300 SoC.
>
>> +  if not-used for SCL can be a GPIO). There are 8 common SDA lines that can be
>> +  assigned to either I2C controller.
>> +
>> +properties:
>> +  compatible:
>> +    const: realtek,rtl9300-i2c
>> +
>> +  reg:
>> +    description: Register offset and size this I2C controller.
> Nope, your reboot mode does not have reg. Either fix reboot mode driver
> or this. Preferably reboot mode.

I'm not sure what you mean by this. The syscon-reboot binding doesn't 
require a reg property and I can only find one in-tree dts 
(turris1x.dts) that actually gives it a reg property.

>
> Best regards,
> Krzysztof
>