Received-SPF: pass (google.com: domain of linux-kernel+bounces-28916-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Message-ID: <6119a057-0ed9-46f0-9232-3839d7d4b2e6@linaro.org>
Date: Wed, 17 Jan 2024 12:35:14 +0100
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH 3/3] dt-bindings: PCI: ti,j721e-pci-host: Add support for
 J722S SoC
Content-Language: en-US
To: Siddharth Vadapalli <s-vadapalli@ti.com>
Cc: bhelgaas@google.com, lpieralisi@kernel.org, kw@linux.com,
 robh@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 vigneshr@ti.com, afd@ti.com, srk@ti.com
References: <20240117102526.557006-1-s-vadapalli@ti.com>
 <20240117102526.557006-4-s-vadapalli@ti.com>
 <c2c7c1fb-af71-4a5d-9e35-13f6066a2ed6@linaro.org>
 <a34eb14b-9944-476a-8b86-e8bb77bcad82@ti.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Autocrypt: addr=krzysztof.kozlowski@linaro.org; keydata=
 xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79
 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu
 JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH
 gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE
 J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj
 NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS
 BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU
 vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM
 Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD
 TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzTRLcnp5c3p0b2Yg
 S296bG93c2tpIDxrcnp5c3p0b2Yua296bG93c2tpQGxpbmFyby5vcmc+wsGUBBMBCgA+FiEE
 m9B+DgxR+NWWd7dUG5NDfTtBYpsFAmI+BxMCGwMFCRRfreEFCwkIBwIGFQoJCAsCBBYCAwEC
 HgECF4AACgkQG5NDfTtBYptgbhAAjAGunRoOTduBeC7V6GGOQMYIT5n3OuDSzG1oZyM4kyvO
 XeodvvYv49/ng473E8ZFhXfrre+c1olbr1A8pnz9vKVQs9JGVa6wwr/6ddH7/yvcaCQnHRPK
 mnXyP2BViBlyDWQ71UC3N12YCoHE2cVmfrn4JeyK/gHCvcW3hUW4i5rMd5M5WZAeiJj3rvYh
 v8WMKDJOtZFXxwaYGbvFJNDdvdTHc2x2fGaWwmXMJn2xs1ZyFAeHQvrp49mS6PBQZzcx0XL5
 cU9ZjhzOZDn6Apv45/C/lUJvPc3lo/pr5cmlOvPq1AsP6/xRXsEFX/SdvdxJ8w9KtGaxdJuf
 rpzLQ8Ht+H0lY2On1duYhmro8WglOypHy+TusYrDEry2qDNlc/bApQKtd9uqyDZ+rx8bGxyY
 qBP6bvsQx5YACI4p8R0J43tSqWwJTP/R5oPRQW2O1Ye1DEcdeyzZfifrQz58aoZrVQq+innR
 aDwu8qDB5UgmMQ7cjDSeAQABdghq7pqrA4P8lkA7qTG+aw8Z21OoAyZdUNm8NWJoQy8m4nUP
 gmeeQPRc0vjp5JkYPgTqwf08cluqO6vQuYL2YmwVBIbO7cE7LNGkPDA3RYMu+zPY9UUi/ln5
 dcKuEStFZ5eqVyqVoZ9eu3RTCGIXAHe1NcfcMT9HT0DPp3+ieTxFx6RjY3kYTGLOwU0EVUNc
 NAEQAM2StBhJERQvgPcbCzjokShn0cRA4q2SvCOvOXD+0KapXMRFE+/PZeDyfv4dEKuCqeh0
 hihSHlaxTzg3TcqUu54w2xYskG8Fq5tg3gm4kh1Gvh1LijIXX99ABA8eHxOGmLPRIBkXHqJY
 oHtCvPc6sYKNM9xbp6I4yF56xVLmHGJ61KaWKf5KKWYgA9kfHufbja7qR0c6H79LIsiYqf92
 H1HNq1WlQpu/fh4/XAAaV1axHFt/dY/2kU05tLMj8GjeQDz1fHas7augL4argt4e+jum3Nwt
 yupodQBxncKAUbzwKcDrPqUFmfRbJ7ARw8491xQHZDsP82JRj4cOJX32sBg8nO2N5OsFJOcd
 5IE9v6qfllkZDAh1Rb1h6DFYq9dcdPAHl4zOj9EHq99/CpyccOh7SrtWDNFFknCmLpowhct9
 5ZnlavBrDbOV0W47gO33WkXMFI4il4y1+Bv89979rVYn8aBohEgET41SpyQz7fMkcaZU+ok/
 +HYjC/qfDxT7tjKXqBQEscVODaFicsUkjheOD4BfWEcVUqa+XdUEciwG/SgNyxBZepj41oVq
 FPSVE+Ni2tNrW/e16b8mgXNngHSnbsr6pAIXZH3qFW+4TKPMGZ2rZ6zITrMip+12jgw4mGjy
 5y06JZvA02rZT2k9aa7i9dUUFggaanI09jNGbRA/ABEBAAHCwXwEGAEKACYCGwwWIQSb0H4O
 DFH41ZZ3t1Qbk0N9O0FimwUCYDzvagUJFF+UtgAKCRAbk0N9O0Fim9JzD/0auoGtUu4mgnna
 oEEpQEOjgT7l9TVuO3Qa/SeH+E0m55y5Fjpp6ZToc481za3xAcxK/BtIX5Wn1mQ6+szfrJQ6
 59y2io437BeuWIRjQniSxHz1kgtFECiV30yHRgOoQlzUea7FgsnuWdstgfWi6LxstswEzxLZ
 Sj1EqpXYZE4uLjh6dW292sO+j4LEqPYr53hyV4I2LPmptPE9Rb9yCTAbSUlzgjiyyjuXhcwM
 qf3lzsm02y7Ooq+ERVKiJzlvLd9tSe4jRx6Z6LMXhB21fa5DGs/tHAcUF35hSJrvMJzPT/+u
 /oVmYDFZkbLlqs2XpWaVCo2jv8+iHxZZ9FL7F6AHFzqEFdqGnJQqmEApiRqH6b4jRBOgJ+cY
 qc+rJggwMQcJL9F+oDm3wX47nr6jIsEB5ZftdybIzpMZ5V9v45lUwmdnMrSzZVgC4jRGXzsU
 EViBQt2CopXtHtYfPAO5nAkIvKSNp3jmGxZw4aTc5xoAZBLo0OV+Ezo71pg3AYvq0a3/oGRG
 KQ06ztUMRrj8eVtpImjsWCd0bDWRaaR4vqhCHvAG9iWXZu4qh3ipie2Y0oSJygcZT7H3UZxq
 fyYKiqEmRuqsvv6dcbblD8ZLkz1EVZL6djImH5zc5x8qpVxlA0A0i23v5QvN00m6G9NFF0Le
 D2GYIS41Kv4Isx2dEFh+/Q==
In-Reply-To: <a34eb14b-9944-476a-8b86-e8bb77bcad82@ti.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

On 17/01/2024 12:24, Siddharth Vadapalli wrote:
> 
> 
> On 17/01/24 16:06, Krzysztof Kozlowski wrote:
>> On 17/01/2024 11:25, Siddharth Vadapalli wrote:
>>> TI's J722S SoC has one instance of a Gen3 Single Lane PCIe controller.
>>> The controller on J722S SoC is similar to the one present on TI's AM64
>>> SoC, with the difference being that the controller on AM64 SoC supports
>>> up to Gen2 link speed while the one on J722S SoC supports Gen3 link speed.
>>>
>>> Update the bindings with a new compatible for J722S SoC and enforce checks
>>> for "num-lanes" and "max-link-speed".
>>>
>>> Technical Reference Manual of J722S SoC: https://www.ti.com/lit/zip/sprujb3
>>>
>>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
>>> ---
>>>  .../devicetree/bindings/pci/ti,j721e-pci-host.yaml  | 13 +++++++++++++
>>>  1 file changed, 13 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
>>> index 005546dc8bd4..b7648f7e73c9 100644
>>> --- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
>>> +++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
>>> @@ -14,6 +14,7 @@ properties:
>>>    compatible:
>>>      oneOf:
>>>        - const: ti,j721e-pcie-host
>>> +      - const: ti,j722s-pcie-host
>>>        - const: ti,j784s4-pcie-host
>>>        - description: PCIe controller in AM64
>>>          items:
>>> @@ -134,6 +135,18 @@ allOf:
>>>            minimum: 1
>>>            maximum: 4
>>>  
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          items:
>>
>> enum
>>
>>> +            - const: ti,j722s-pcie-host
>>> +    then:
>>> +      properties:
>>> +        max-link-speed:
>>> +          const: 3
>>> +        num-lanes:
>>> +          const: 1
>>
>> Similarly to previous patch: What is the point of all this? You have
>> direct mapping compatible-property, so encode these in the drivers.
> 
> Ok. I will drop patches 1 and 2 of this series and only post v2 of this patch
> for adding a new compatible for J722S SoC without any checks for
> "max-link-speed" or "num-lanes" for the new compatible.

Without driver change? So how does it solve my comment. I want to move
all these unnecessary properties to the driver.

Best regards,
Krzysztof