From nobody Thu Apr 2 00:14:15 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6FB2C3DFC9E; Wed, 1 Apr 2026 09:54:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775037273; cv=none; b=mWrkAToJiaJraDW/0253yChuif50BxecBdEY2so1OWH7IYOtaWNmTitytq+vWaEvCsU55B1nTtGHUcHHfZZkokmW7Y4VzXQVcv1v+7R3jyo5sNN0miJkAF49SCS6OqPp8fg3I0qH19hPzwKG+u+RZrLmGM79CfAf8Dl0gUYi7BI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775037273; c=relaxed/simple; bh=h5Ir1KiWUSZRowTk+VS/ZgfqrlKy67KWydZeVojwgsk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PRw6toDrPcmVFo3fsxe1Gc+zvvULVQjdLdM6smDCf5YjxIU2+JAr+z9oaZqhj5aYYdRe2hRXAa8qwnBVDayMBjsS07vuJYqD13uz7EEm3uIH8t0efeQ7HH7qaWS8o/vA4kTknC62v3ZUBM4xP/AKrv/T/yyUpAi7/Uq4gb8SqCE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=PAZRJbuw; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="PAZRJbuw" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E22FA2E98; Wed, 1 Apr 2026 02:54:20 -0700 (PDT) Received: from donnerap.manchester.arm.com (donnerap.manchester.arm.com [10.33.8.81]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D01513F7D8; Wed, 1 Apr 2026 02:54:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1775037266; bh=h5Ir1KiWUSZRowTk+VS/ZgfqrlKy67KWydZeVojwgsk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PAZRJbuwARBiu7AxQeVMj7NXhgU3wVCWk5g7zLF09uCYk5TSZkZTR48e5oihFynpu G+PlvaQvI7+9ccGB4s4f8x2eBzCYlpXtN8ZZCeiqwyXH2+qAvU01SB/2M3ajC4k0l/ uoMaO/K794QmSSKMWQwPQDEeJKR+8WQE3PKdd5Dk= From: Philip Radford To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, arm-scmi@vger.kernel.org, linux-pm@vger.kernel.org Cc: sudeep.holla@arm.com, james.quinlan@broadcom.com, f.fainelli@gmail.com, vincent.guittot@linaro.org, etienne.carriere@st.com, peng.fan@oss.nxp.com, michal.simek@amd.com, quic_sibis@quicinc.com, dan.carpenter@linaro.org, d-gole@ti.com, souvik.chakravarty@arm.com, Philip Radford Subject: [PATCH v4 11/11] powercap: arm_scmi: Add get_power_uw to synthetic node Date: Wed, 1 Apr 2026 10:53:49 +0100 Message-ID: <20260401095349.2217840-12-philip.radford@arm.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260401095349.2217840-1-philip.radford@arm.com> References: <20260401095349.2217840-1-philip.radford@arm.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 Content-Type: text/plain; charset="utf-8" Exposes the current power usage from the immediate children of the synthetic (root) powercap node. Iterates over pr->spzones and sums per-zone power. Signed-off-by: Philip Radford --- drivers/powercap/arm_scmi_powercap.c | 29 ++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/powercap/arm_scmi_powercap.c b/drivers/powercap/arm_sc= mi_powercap.c index 6fc2cab30b05..53fcbf178e8c 100644 --- a/drivers/powercap/arm_scmi_powercap.c +++ b/drivers/powercap/arm_scmi_powercap.c @@ -270,9 +270,34 @@ static int instance_root_release(struct powercap_zone = *pz) return 0; } =20 -static int instance_root_get_power_uw(struct powercap_zone *pz, u64 *v) +static int instance_root_get_power_uw(struct powercap_zone *pz, u64 *power= _u) { - *v =3D 0; + struct scmi_powercap_zone *root =3D to_scmi_powercap_zone(pz); + struct scmi_powercap_zone *child; + struct scmi_powercap_root *pr; + u64 acc =3D 0; + u64 p; + int ret; + + if (!pz || !power_uw) + return -EINVAL; + + pr =3D container_of(root, struct scmi_powercap_root, agent_root); + if (!pr) + return -ENODEV; + + list_for_each_entry(child, &pr->registered_zones[0], node) { + if (child =3D=3D &pr->agent_root) + continue; + + ret =3D scmi_powercap_get_power_uw(&child->zone, &p); + if (!ret) + acc +=3D p; + else + dev_dbg(child->dev, "Failed to read child power: %u\n", ret); + } + + *power_uw =3D acc; return 0; } =20 --=20 2.47.3