Re: [PATCH v1 8/8] ARM: dts: aspeed: System1: PS, sensor and more

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Ninad Palsule <ninad@linux.ibm.com>,
	robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
	conor+dt@kernel.org, joel@jms.id.au, andrew@codeconstruct.com.au,
	peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca,
	keescook@chromium.org, tony.luck@intel.com, gpiccoli@igalia.com,
	johannes.holland@infineon.com, linux@roeck-us.net,
	broonie@kernel.org
Cc: patrick.rudolph@9elements.com, vincent@vtremblay.dev,
	peteryin.openbmc@gmail.com, lakshmiy@us.ibm.com,
	bhelgaas@google.com, naresh.solanki@9elements.com,
	alexander.stein@ew.tq-group.com, festevam@denx.de,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-integrity@vger.kernel.org, linux-hardening@vger.kernel.org,
	geissonator@yahoo.com
Subject: Re: [PATCH v1 8/8] ARM: dts: aspeed: System1: PS, sensor and more
Date: Thu, 14 Dec 2023 08:24:50 +0100	[thread overview]
Message-ID: <1c5ace65-2fd8-4503-b22f-e0f564d1c83f@linaro.org> (raw)
In-Reply-To: <edcdcea2-febc-4859-9ccf-b8c59b794f01@linux.ibm.com>

On 13/12/2023 20:49, Ninad Palsule wrote:
> Hello Krzysztof,
> 
> On 12/13/23 13:37, Krzysztof Kozlowski wrote:
>> On 13/12/2023 20:02, Ninad Palsule wrote:
>>> Hello Krzysztof,
>>>
>>> On 12/12/23 14:26, Krzysztof Kozlowski wrote:
>>>> On 12/12/2023 17:40, Ninad Palsule wrote:
>>>>> This drop adds following devices in the device tree.
>>>>> - EEPROM/VPD
>>>>> - Power supplies
>>>>> - Humidity, pressure and temperature sensors.
>>>>> - Trusted platform module(TPM) chip
>>>>>
>>>>> Tested:
>>>>>       This board is tested using the simics simulator.
>>>>>
>>>>> Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
>>>>> ---
>>>> Don't mix DTS with drivers. DTS and drivers go via different subsystems
>>>> and cannot have dependencies, so why DTS is patch #6, then driver #7 and
>>>> now again DTS #7?
>>> There is a dependency on driver code as patch #8 uses the compatibility
>>> string added in driver patch #7.  I have now moved driver patch at the
>>> start. Is that ok? OR you are suggesting something else?
>> First, there is no dependency. Second, except confusing order anyway DTS
>> will go via separate trees. Third, again, there is no dependency. If
>> there is, your patchset is broken and this needs to be fixed. Although I
>> don't understand how new hardware can depend on driver... it's really odd.
> 
> Thanks for the quick response.
> 
> This board uses the nuvoton TPM device. The tpm devices uses 
> "nuvoton,npct75x" driver hence we added it in the device tree. If the 
> driver doesn't have this compatibility string then it won't load. So if 
> someone tries to use this board then tpm won't work unless the 

... and if there is no board it also fails to load.

> compatibility string is added in the driver. That is the dependency I am 
> talking about.

This is not a dependency! It's unrelated.

Best regards,
Krzysztof

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