linux-kernel - Re: [PATCH 2/2] ARM: dts: qcom: Add support for Motorola Moto G (2013)

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Date: Tue, 26 Mar 2024 11:10:14 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Stanislav Jakubek <stano.jakubek@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dts: qcom: Add support for Motorola Moto G
 (2013)

On 25.03.2024 9:25 PM, Stanislav Jakubek wrote:
> On Mon, Mar 25, 2024 at 08:28:27PM +0100, Konrad Dybcio wrote:
>> On 24.03.2024 3:04 PM, Stanislav Jakubek wrote:
>>> Add a device tree for the Motorola Moto G (2013) smartphone based
>>> on the Qualcomm MSM8226 SoC.
>>>
>>> Initially supported features:
>>>   - Buttons (Volume Down/Up, Power)
>>>   - eMMC
>>>   - Hall Effect Sensor
>>>   - SimpleFB display
>>>   - TMP108 temperature sensor
>>>   - Vibrator
>>>
>>> Signed-off-by: Stanislav Jakubek <stano.jakubek@...il.com>
>>> ---
>>
>> [...]
>>
>>> +		hob-ram@...0000 {
>>> +			reg = <0x0f500000 0x40000>,
>>> +			      <0x0f540000 0x2000>;
>>> +			no-map;
>>> +		};
>>
>> Any reason it's in two parts? Should it be one contiguous region, or
>> two separate nodes?
>>
>> lgtm otherwise
> 
> Hi Konrad, I copied this from downstream as-is.
> According to the downstream docs [1]:
> 
> HOB RAM MMAP Device provides ability for userspace to access the
> hand over block memory to read out modem related parameters.
> 
> And the two regs are the "DHOB partition" and "SHOB partition".

Oh right, motorola made some inventions here..

> 
> I suppose this is something Motorola (firmware?) specific (since the
> downstream compatible is mmi,hob_ram [2]).
> Should I split this into 2 nodes - dhob@...0000 and shob@...0000?

Yes please and add the downstream txt link to the commit message in case
somebody was curious down the line.

Konrad