From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 766E154FB2; Mon, 29 Jan 2024 09:40:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706521212; cv=none; b=eQZ1qtD2IXATLbg5kbrLArbB92Cz/w2yisFCADkVVoUq4qXh2cpCiqqoyileUMtFUhs+QQzvS49/jsqMmOkWg5UPmpmxXOrGj/+zCOezI6QyMAjSzOprc2B/sMyciv8hrsihgGSkLBp3+JgV7Q+FgTV2IuP33idBa60zmqlMyek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706521212; c=relaxed/simple; bh=9Vv3v+/Pe4SpvRgFIw1kkB8d7DptlxovoLWFbzSC3eo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=DVVSyVIPcT++l3lTqTxE5NlOs9S5r6XDN22dvweMJUeDAfITsBHbvZVuCGipBo0wAADLj/wAQWpELixXtcEJVVSROvHFWg5hoWARsFYlsztNa1+kzXmxbyDgy+CHBMafGyFg9aGg4mbB76bJ+gZThHovTJbidKdoqP61sMsl0co= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WP9btXCG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WP9btXCG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48CBEC433F1; Mon, 29 Jan 2024 09:40:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706521211; bh=9Vv3v+/Pe4SpvRgFIw1kkB8d7DptlxovoLWFbzSC3eo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=WP9btXCGmiSjvjiwWT+vA9mDVV7IDFi4m8JNXFpYB3XzzVLMARqRVK88iyvsukJS3 ffGu0BrsNFvj2k4ZGFNOgGxJU+U/IJKiGzKJQlDaDMVyhkWgHT+H8XYFNrtclPmfmR OTCwotaAVMU8tpgPbYOXlDZP2+N1rIIl/nUcyk5MV5ATutESvg3Kj0PFoMajv3Cptz l8UJRanPvdcJ5BgFge/BDIMO27I4NlU282g+qUCkAeiDUlRJVF65aAYr5cG9M4OJRh zzddY4yBYr8uCxdnkp7IzkD2p95YzXHgAYVe/Y6IXNOgNpTiqt3BJiTikdL0NL8Jso zk11Mieaf1fzg== Message-ID: <8f525770-7e39-4bf1-9ad3-803826ffbb1e@kernel.org> Date: Mon, 29 Jan 2024 10:40:04 +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 2/2] pwm: Add GPIO PWM driver To: Stefan Wahren , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: andy.shevchenko@gmail.com, Angelo Compagnucci , Philip Howard , Linus Walleij , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, Vincent Whitchurch References: <20240128163630.104725-1-wahrenst@gmx.net> <20240128163630.104725-3-wahrenst@gmx.net> Content-Language: en-US From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 28/01/2024 17:36, Stefan Wahren wrote: > From: Vincent Whitchurch > > Add a software PWM which toggles a GPIO from a high-resolution timer. > > This will naturally not be as accurate or as efficient as a hardware > PWM, but it is useful in some cases. I have for example used it for > evaluating LED brightness handling (via leds-pwm) on a board where the > LED was just hooked up to a GPIO, and for a simple verification of the > timer frequency on another platform. > ... > + > +static struct platform_driver pwm_gpio_driver = { > + .driver = { > + .name = "pwm-gpio", > + .of_match_table = pwm_gpio_dt_ids, > + }, > + .probe = pwm_gpio_probe, > + .remove_new = pwm_gpio_remove, > +}; > +module_platform_driver(pwm_gpio_driver); > + > +MODULE_DESCRIPTION("PWM GPIO driver"); > +MODULE_ALIAS("platform:pwm-gpio"); You should not need MODULE_ALIAS() in normal cases. If you need it, usually it means your device ID table is wrong (e.g. misses either entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute for incomplete ID table. Best regards, Krzysztof