From nobody Mon Feb 9 16:32:57 2026 Received: from smtpdh20-2.aruba.it (smtpdh20-2.aruba.it [62.149.155.165]) (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 9ACCA12C47E for ; Fri, 12 Apr 2024 08:44:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.149.155.165 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712911482; cv=none; b=DpYZCj17NuvJN9D7fJlmxxqrLDiIo2dTNkHQN+SqNNzaPBc4Bo1ROTXZ4mNLj9IVGKq1hmHBdhU6S1DyehRtapmMED7BSRzFRKjre0+/s9736qau9ypJLiQec+duo8Qp+bCgs9zugHYtrnutqFGACnhjN+oC7DLHy24Q5pOJQ98= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712911482; c=relaxed/simple; bh=KCcJfOmxJYJnvn9ISK24CrnwVdcYHY0uQ34DDVMZgBw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=tOhdhd1+MTTuJRq1Deo9nVqZCpesoCpt2UuiXdv+wI/0hw9rr8cdpC2t7s6q6Q0bFo2H065hw7z99fSHKWc8aXmRGViIe8uMbH3+tJeEHCGqD4jbdd+IKYHnikWsS6IIvZ9awe3qrOxpLuLuKOF3rxJVH1dKVnAw0/+UW/XuhXY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=engicam.com; spf=pass smtp.mailfrom=engicam.com; dkim=pass (2048-bit key) header.d=aruba.it header.i=@aruba.it header.b=jVu0MBnx; arc=none smtp.client-ip=62.149.155.165 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=engicam.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=engicam.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=aruba.it header.i=@aruba.it header.b="jVu0MBnx" Received: from engicam.com ([77.32.11.127]) by Aruba Outgoing Smtp with ESMTPSA id vCWKrIsVvwWj2vCWLr0hxW; Fri, 12 Apr 2024 10:44:29 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=aruba.it; s=a1; t=1712911469; bh=KCcJfOmxJYJnvn9ISK24CrnwVdcYHY0uQ34DDVMZgBw=; h=From:To:Subject:Date:MIME-Version; b=jVu0MBnxKKGm/ALzH+K3vsnfetEtVeOJ+hz1BjGSbsoIkfzQlsWGvvHxw8ztkVty9 qf6rdx7hj2QrR8u8iCOkCq1VwJPPvXNHRleoOUFmFUIum12mo9t28TysC+b/h03Mqq mKWf+XX5lwCoXBcDEx+77eJzwbo0YzzSL1cvLh9+HlPU9N4C892mK02iaE7pP2A8G3 YCbmYbiXlmf9WBxSeSFEOHmFiZhcreM42LCLXrb6Z2InTFR8PwWdI/w1LUdolfTIfo qXW2Hh9fJeF3KeVUxYkLpA/p4THaIuR5JfWS07XKlHXS7CCQs96QR5avW985P+3G0R LXjMzg/2YPabA== From: Fabio Aiuto To: Mark Brown , Liam Girdwood , Krzysztof Kozlowski , Rob Herring , Conor Dooley Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Matteo Lisi , Mirko Ardinghi Subject: [PATCH v4 2/2] regulator: pca9450: make warm reset on PMIC_RST_B assertion Date: Fri, 12 Apr 2024 10:44:28 +0200 Message-Id: <20240412084428.400607-3-fabio.aiuto@engicam.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240412084428.400607-1-fabio.aiuto@engicam.com> References: <20240412084428.400607-1-fabio.aiuto@engicam.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CMAE-Envelope: MS4xfK4oHPsPdScFzaYXVXev1tdi4Txm6ETsUGH2jspVbqAutHrXEIWcUrjnGZ9ffT8sz70SQGyAJhqLj1JpS2icoNVbYd+jE0GQMAhMTewqK0tdlAFaWc4P aSAA1Ufl4kz6ZD/yL1YyM+036tU2Adfcwmkb5y4mc1jDPKWQ5yPbDxqvn++pMVD65qNC+z+QDEMxboIHFcv1U1v9V6sr9ckSm1tadAs16zt1ogILT7M4HI84 eBXxgiTKjCBfmPXIDUgpYVNGs08tIKr0C/7Eb7+lEeeqfEdqPbzjt1pZEV0qQV0PAXQZb9yejU6C7YJ63h2aedMe6ejlYBpJUXfPkqE8vd56g6+DI01K2UUF hZZ3tODALy3azWzjLCJBhKZ14Rq3AYuNIetp0he5MWieKgp8Ux6kcB88CsLtXNogBtsFgUBLjatCdXiZbKeGZDZKtd8+cb5tCRDqXw2+HHSI4pnSWUY= Content-Type: text/plain; charset="utf-8" The default configuration of the PMIC behavior makes the PMIC power cycle most regulators on PMIC_RST_B assertion. This power cycling causes the memory contents of OCRAM to be lost. Some systems needs some memory that survives reset and reboot, therefore this patch is created. This patch extends commit 2364a64d0673 ("regulator: pca9450: Make warm reset on WDOG_B assertion") to the other reset input source PMIC_RST_B as per pmic specs. Cc: Matteo Lisi Cc: Mirko Ardinghi Signed-off-by: Fabio Aiuto --- drivers/regulator/pca9450-regulator.c | 11 ++++++++--- include/linux/regulator/pca9450.h | 6 ++++++ 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/regulator/pca9450-regulator.c b/drivers/regulator/pca9= 450-regulator.c index be488c5dff14..3a7f238de1a5 100644 --- a/drivers/regulator/pca9450-regulator.c +++ b/drivers/regulator/pca9450-regulator.c @@ -999,11 +999,16 @@ static int pca9450_i2c_probe(struct i2c_client *i2c) else reset_ctrl =3D WDOG_B_CFG_COLD_LDO12; =20 - /* Set reset behavior on assertion of WDOG_B signal */ + if (of_property_read_bool(i2c->dev.of_node, "nxp,pmic-rst-b-warm-reset")) + reset_ctrl |=3D PMIC_RST_CFG_WARM; + else + reset_ctrl |=3D PMIC_RST_CFG_COLD_LDO12; + + /* Set reset behavior on assertion of WDOG_B/PMIC_RST_B signal */ ret =3D regmap_update_bits(pca9450->regmap, PCA9450_REG_RESET_CTRL, - WDOG_B_CFG_MASK, reset_ctrl); + WDOG_B_CFG_MASK | PMIC_RST_CFG_MASK, reset_ctrl); if (ret) { - dev_err(&i2c->dev, "Failed to set WDOG_B reset behavior\n"); + dev_err(&i2c->dev, "Failed to set WDOG_B/PMIC_RST_B reset behavior\n"); return ret; } =20 diff --git a/include/linux/regulator/pca9450.h b/include/linux/regulator/pc= a9450.h index 243633c8dceb..d87f0b410b00 100644 --- a/include/linux/regulator/pca9450.h +++ b/include/linux/regulator/pca9450.h @@ -227,6 +227,12 @@ enum { #define WDOG_B_CFG_COLD_LDO12 0x80 #define WDOG_B_CFG_COLD 0xC0 =20 +#define PMIC_RST_CFG_MASK 0x30 +#define PMIC_RST_CFG_NONE 0x00 +#define PMIC_RST_CFG_WARM 0x10 +#define PMIC_RST_CFG_COLD_LDO12 0x20 +#define PMIC_RST_CFG_COLD 0x30 + /* PCA9450_REG_CONFIG2 bits */ #define I2C_LT_MASK 0x03 #define I2C_LT_FORCE_DISABLE 0x00 --=20 2.34.1