From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 484081B961 for ; Fri, 26 Jan 2024 11:56:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706270185; cv=none; b=m7QjjyFBOXogY0w9DA1nvyfJFDy07DvkM5JqnjK17ilSvaaf8jI1dA9vlvM3ujQwOpO30Q0iit1R0ERmh0uQmALmhmpkT7dt1vfJwptPiL5RZ82F/tMc6IOwWCOQAogeBnPxs6wq3S7yhIzrU4Pe2UkS4c1WW85rh04z8vENP3s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706270185; c=relaxed/simple; bh=RmGbAEvyMyBmZPV9rMtVayM5gvBAINtVmRS710SV+sM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=mLYA8dkvfLG9h8RQpyN/amjnqEYs7F3F9s4KWCSmsCtOlL4VycuWGL0Y5qVlSCIlYJ/esCN26mNY5NREbHGPdc6ol6fXIhQIwps3ZgWML4c10zprTKu/vpE5s3/5W/0tLsUa0Ylkg/TDndoTfv87bg4Pxkbljv4uh2nAghh0WI4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=E4i8Of7c; arc=none smtp.client-ip=209.85.128.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="E4i8Of7c" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-40ed252edd7so10751555e9.0 for ; Fri, 26 Jan 2024 03:56:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1706270182; x=1706874982; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=DO5Cw99+U4E+0Nt0Wph/a1bGBWtbN/z5sxXuqQozhd8=; b=E4i8Of7cpOA7zx9jqf89I9uAa1fdpjBU/e5zqku8N7CEnUWrepwJJsthyWVkXFWNLB 1lccH3QzM4z3onDLTQMWKhbDDvtVb8iEfrVnkic2eC1jWc9fsMXdSRy7zLoxMluiYg+0 mxEHN9Rx3W9jGOJYqf0l+nlOi3/UKoxHs5rNpQ+0tzfJ+Xi2MWCmeZoWCH+giIun3+u4 xZex1Zp1HysV8HsCmmxW2ypDHUEKpH+7tnFXwdisQlbLPgQWjpNxcIIYm44fKkwIKBBL 7Rdol7PBjJWsLfwrJLuSQH37jbOQVi9e5au48st2e1XIKWS3fM6eq+c7zFDTpx8dpDJp Wj5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706270182; x=1706874982; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=DO5Cw99+U4E+0Nt0Wph/a1bGBWtbN/z5sxXuqQozhd8=; b=awTH4/hfO9oDq/jWyn7MBl66yCSX5YieTT7iJ+9rC0M9TaUva3rvMwN46I1NnPSDcw btJXY3KxbcaxlywqltEGT0iVvxYlgHY7LoVA0ALUw8y4zNkrjdSjb//K2pgOEzxyR4Wt 7RmkKypyfNGxVMtio35Tdh4FFeZ+C24hkdaboiToIabmyowcVlAfP/dNvI8nrYGDGyab Xq4Er18TC5ULyXO7/YOj71sMXLW9cEsQSx96ivuhBF3oR8SqHhGRPUzTVNqbhmmOpLa9 zUnq81FNMJJ3W9g/bGoAfZAcB1TojRuVIG9RjTm34J1EZktaduyPvVj7lHGnh9MQgFUj SUGg== X-Gm-Message-State: AOJu0Yy2FMHY8pGcAypnleNMvtlQmS0dVLelEgX+Swtd7RJR4fzLwBOt S5aur2U3EntiSusorwgyaGXeD2Uw3hbJM73aXui4QNwcG6FT6u280js2hz+qqYk= X-Google-Smtp-Source: AGHT+IHmdKLzey2QUAfoaZyCALkG/ipXSmR5+Ufuq+v1N1QQdVg3ypQp3xdsFV2v37UQKEtWI2DvjA== X-Received: by 2002:a05:600c:5191:b0:40e:8799:7348 with SMTP id fa17-20020a05600c519100b0040e87997348mr596666wmb.68.1706270182598; Fri, 26 Jan 2024 03:56:22 -0800 (PST) Received: from [192.168.1.20] ([178.197.215.66]) by smtp.gmail.com with ESMTPSA id vo1-20020a170907a80100b00a2c11a438a8sm556451ejc.25.2024.01.26.03.56.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Jan 2024 03:56:21 -0800 (PST) Message-ID: <3e8dfaf3-85a4-42bf-829c-4835f3de2d35@linaro.org> Date: Fri, 26 Jan 2024 12:56:19 +0100 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 08/17] clk: eyeq5: add platform driver Content-Language: en-US To: =?UTF-8?Q?Th=C3=A9o_Lebrun?= , Gregory CLEMENT , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thomas Bogendoerfer , Linus Walleij , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Philipp Zabel Cc: Vladimir Kondratiev , linux-mips@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Petazzoni , Tawfik Bayouk , linux-gpio@vger.kernel.org References: <20240123-mbly-clk-v3-0-392b010b8281@bootlin.com> <20240123-mbly-clk-v3-8-392b010b8281@bootlin.com> <127fd51b-cd64-4e00-99d6-7be9b79f2dcc@linaro.org> <001993b9-ea0c-49c3-a4e5-4cea10c54082@linaro.org> From: Krzysztof Kozlowski 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 25/01/2024 12:53, Théo Lebrun wrote: > Hi, > > On Thu Jan 25, 2024 at 8:46 AM CET, Krzysztof Kozlowski wrote: >> On 24/01/2024 17:41, Théo Lebrun wrote: >>> Hello, >>> >>> On Wed Jan 24, 2024 at 8:05 AM CET, Krzysztof Kozlowski wrote: >>>> On 23/01/2024 19:46, Théo Lebrun wrote: >>>>> Add the Mobileye EyeQ5 clock controller driver. It might grow to add >>>>> support for other platforms from Mobileye. >>>>> >>>>> It handles 10 read-only PLLs derived from the main crystal on board. It >>>>> exposes a table-based divider clock used for OSPI. Other platform >>>>> clocks are not configurable and therefore kept as fixed-factor >>>>> devicetree nodes. >>>>> >>>>> Two PLLs are required early on and are therefore registered at >>>>> of_clk_init(). Those are pll-cpu for the GIC timer and pll-per for the >>>>> UARTs. >>>>> >>>> >>>> >>>>> +#define OLB_PCSR1_RESET BIT(0) >>>>> +#define OLB_PCSR1_SSGC_DIV GENMASK(4, 1) >>>>> +/* Spread amplitude (% = 0.1 * SPREAD[4:0]) */ >>>>> +#define OLB_PCSR1_SPREAD GENMASK(9, 5) >>>>> +#define OLB_PCSR1_DIS_SSCG BIT(10) >>>>> +/* Down-spread or center-spread */ >>>>> +#define OLB_PCSR1_DOWN_SPREAD BIT(11) >>>>> +#define OLB_PCSR1_FRAC_IN GENMASK(31, 12) >>>>> + >>>>> +static struct clk_hw_onecell_data *eq5c_clk_data; >>>>> +static struct regmap *eq5c_olb; >>>> >>>> Drop these two. No file-scope regmaps for drivers. Use private container >>>> structures. >>> >>> I wouldn't know how to handle the two steps then. Two clocks and the clk >>> provider are registered at of_clk_init() using CLK_OF_DECLARE_DRIVER(). >> >> Right, if some clocks have to be early, CLK_OF_DECLARE_DRIVER needs >> static ones. But your commit subject says it is a platform driver and >> all other pieces of this code is rather incompatible with this approach. > > That is my bad on the commit subject. What do you refer to by "all other > pieces of this code is rather incompatible with this approach"? That you depend on syscon. If it was regular MMIO block in SoC space, then no problem. If you depend on anything else providing you regmap, then any initcall ordering is fragile and error-prone. Avoid. > > I've tried to minimise the use of static variables. Therefore as soon as > the probe is started, we switch to the usual way of using a private > struct that contains our info. > >> >> Do not use CLK_OF_DECLARE_DRIVER for cases where you have dependencies >> because it forces you to manually order initcalls, which is exactly what >> we do not want. > > What should I be using? I got confirmation from Stephen that this > mixture of CLK_OF_DECLARE_DRIVER() + platform driver is what I should > be using as review in my V1. > > https://lore.kernel.org/lkml/fa32e6fae168e10d42051b89197855e9.sboyd@kernel.org/ I see. In such case I believe it is error on relying on syscon. Best regards, Krzysztof