From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lj1-f180.google.com (mail-lj1-f180.google.com [209.85.208.180]) (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 A4E8815E5CF; Tue, 20 Aug 2024 23:18:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724195934; cv=none; b=q46VI6Fywn8q3L9lIXoUeCxOzTuLA12bvy4YfVlT6u0uZ0dcO4oB+R/wrWz6n8wQtHTDtszLysE8EbkxILgX1L9UPjFrBymxSIkCy+c3DMufhKxySR48hXBXY7/ogzJjbZBQX7y3KBhu7Ja4GqRaL6pK3rzn7r1FbfFGW5c1T5Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724195934; c=relaxed/simple; bh=d60nT1u03Qy3Q7s2fv6T2XrNNU7KG4m5JFfp1UY20n0=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=E6Z15A1+UlQ7IxudvizLGeKz9K/Z4SfuONCBsGVqRSQUyYdLHAgILssV+rQ8U5dF99h0DdgBl2s92V6tJoIBqB7Rfw8L+UUCGHw3ZH4pL+GhCsKguv5YaqjSsw0NXUHjTQojvNHk2XLKB2fCWOCEr27xwpRPtqqRCFNUdj6re2s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ONq7IcJ2; arc=none smtp.client-ip=209.85.208.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ONq7IcJ2" Received: by mail-lj1-f180.google.com with SMTP id 38308e7fff4ca-2f3cb747ed7so43614771fa.0; Tue, 20 Aug 2024 16:18:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1724195931; x=1724800731; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=JF6wfgyRdYKFN8d5+8XVfRoeXiJGMMUTPZXUm54bPBc=; b=ONq7IcJ27MxR0RbeLVryPUjMMJqsg8vhlnbI9FB9V5d2C6krXvJxDVHVw/WqGUeHPI XzUwJddU6EKa24z1L22uLfFt8Qn+iFfflY1wWhSZceceM2MK9NgApz0lQAkHwsaBue9H Lf33ad0WsO5Ea/saBc86F669pWXTPyxTNYwKjy2HkBFzUofR0cBsCrmOf+xWMT9vQNIM ygVBKSDIHlP/3wHlPFLTHBvjSXj5SM+q/tnyEzbtVP4HlsChsIqu0gtQA/SoDoU+MZh+ p0YFBNWhKvcso6nxSxftsv+agdIUORe4yQ3klXCHlq42SQVi522OKtid0WQRNUMip9Df gi7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724195931; x=1724800731; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JF6wfgyRdYKFN8d5+8XVfRoeXiJGMMUTPZXUm54bPBc=; b=BFZuX7lyW7MYqYQyqKDLJNgVN6/qHFKvsOHEAJJV9dzCpuIxOJruHAEMHQkfOBd2Uf 9wkOfzvivejarsOQ9vOc+VaXDfTQXFFlQxJzrIKeMsuuvX3PctbzbTX1bFcjfapqQR+8 dRiAxuyWLKSD5BvRfQkD9VKf//qc/E874xkhXDdydFsJfE3rco3PRMtpi2yZSpV+BGoS x3AZqlOa63lMIJHQQLC6irmPMor8ET2y3WWE8jbm9cIZU5QG/epUVafjV9Q7b3wJ/Jb3 KglC1e8QS4hsQzUpiBGsEBowCAR6DSgmuKrXNEV1iUhgcv95xcF4CfAWokg/cEjjtBxh TKpg== X-Forwarded-Encrypted: i=1; AJvYcCUj4/Rr7fJW4RUM7s9fsZ5BW8Zd8JVaMNtrL1zYkSYIIiMC1qfSbtxjTBts8/1FHcaLDu3vaGmEbC6d@vger.kernel.org, AJvYcCVjKQHliUJjk2pI12pMoaC5BXTdREbJxHtAhUtQKSMDlX9GjslUJ4iNO/axuyrIi5QeLvdMsMRD5VPr@vger.kernel.org X-Gm-Message-State: AOJu0YzZUeDqdFsenziRWQnBWRzFP7Vcaqp3h7FkyjEX6w/8fvX9NLas 7iuLWQU/OBYe23cBWheQK0omh+GfNlt6o/oXcUJHjz4TTmwpYGHWBmtZ+Y4BuvHslA8SKU0Ia9L 4mFIKRB/846psR4N+GZJYOiJxlUY= X-Google-Smtp-Source: AGHT+IE1Ov1daYK0RsGFoMEB0RO19ht78k22yFLni1S5zEZjKgYuK2roDvpFAcrUbgGVXqiTfaLBjGwsK78HhqStM+U= X-Received: by 2002:a05:6512:3a94:b0:52c:e084:bb1e with SMTP id 2adb3069b0e04-533485565cfmr211475e87.13.1724195930268; Tue, 20 Aug 2024 16:18:50 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: In-Reply-To: From: Fabio Estevam Date: Tue, 20 Aug 2024 20:18:38 -0300 Message-ID: Subject: Re: pca953x: Probing too early To: "Russell King (Oracle)" Cc: Andrew Lunn , Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , "open list:GPIO SUBSYSTEM" , "open list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , Oleksij Rempel , andi.shyti@kernel.org, linux-i2c , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Russell, On Tue, Aug 20, 2024 at 7:22=E2=80=AFPM Russell King (Oracle) wrote: > This is where: > > ret =3D regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chi= p)); > if (ret < 0) { > dev_err(&chip->client->dev, "failed writing register\n"); Yes, correct. This is where -EAGAIN is coming from: [ 1.745657] pca953x 2-0020: supply vcc not found, using dummy regulator [ 1.752502] pca953x 2-0020: using no AI [ 1.756579] pca953x 2-0020: **** failed writing register: -11 [ 1.762510] pca953x: probe of 2-0020 failed with error -11 [ 1.768298] i2c i2c-2: IMX I2C adapter registered The pca953x driver tries to write to the i2c-2 bus before i2c-2 is register= ed. This is the point I don't understand: how can the pca953x driver get probed before its I2C bus parent? Thanks