From nobody Sun Feb 8 16:32:12 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 E1D2D29D28A for ; Mon, 12 Jan 2026 10:14:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768212871; cv=none; b=DGJHkAU8jfzXSXfHdUGJyMeM+z5Raac/Zvih5zL7HC/uo6VTaucQneQOiSHyetvvKRIuOOje66d5PA9tUOIHhhvvnQZuIJ4cRxvPWnPskhSvKn0F2nyBe98L6/iZI766bmTtkcAjNuZJsADW5PSh/HQU/pW0m7o+uETM3vMMy70= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768212871; c=relaxed/simple; bh=sU5K5hcXTa4o6eQuCTfla84bPf+52jnqSx3MVZTwGMo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MbRB8V5jvl1sgK5gjbUPu40KYC+LmmH+577aFNts6j7jpwDxrHVj+IyS9YMisXxXQFbVvbgkdsb27AXJ/06Mc8kdgUlgTEv57FhJBVJ43Q6IiIRewvRJCtFTXVsk+9yJyyat3ZMesSipKASSvncnr2cgFBNM/9iJ0wsYxS32Rbk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=LvVLyLnD; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LvVLyLnD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1768212866; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rFurCOq7m06qYdTncSUSeHZ26rBTB4/HSXWqKkQxEiM=; b=LvVLyLnDUYmHfFqLETd888sd9GMgtl/ZaiadlPl00idTVA+CrCeCn9LbakgRh2iNjaqaca vkuGcLGcblm/pAsYKCBCzc4iacaMCcogOxhVwGrzmHV4xTciLGXEygKAaL774/MuYibtC6 z8Zlk58ENT9hIs1ptJrpIcxgOmjkQ/Q= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-665-7wUBYKvvNyScNtYTSq3CoQ-1; Mon, 12 Jan 2026 05:14:23 -0500 X-MC-Unique: 7wUBYKvvNyScNtYTSq3CoQ-1 X-Mimecast-MFC-AGG-ID: 7wUBYKvvNyScNtYTSq3CoQ_1768212861 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DC0BE1800359; Mon, 12 Jan 2026 10:14:20 +0000 (UTC) Received: from p16v.bos2.lab (unknown [10.44.32.158]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 4B81A18004D8; Mon, 12 Jan 2026 10:14:16 +0000 (UTC) From: Ivan Vecera To: netdev@vger.kernel.org Cc: Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Vadim Fedorenko , Arkadiusz Kubalewski , Jiri Pirko , Prathosh Satish , Petr Oros , linux-kernel@vger.kernel.org, Michal Schmidt Subject: [PATCH net-next 1/3] dpll: add dpll_device op to get supported modes Date: Mon, 12 Jan 2026 11:14:07 +0100 Message-ID: <20260112101409.804206-2-ivecera@redhat.com> In-Reply-To: <20260112101409.804206-1-ivecera@redhat.com> References: <20260112101409.804206-1-ivecera@redhat.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-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" Currently, the DPLL subsystem assumes that the only supported mode is the one currently active on the device. When dpll_msg_add_mode_supported() is called, it relies on ops->mode_get() and reports that single mode to userspace. This prevents users from discovering other modes the device might be capable of. Add a new callback .supported_modes_get() to struct dpll_device_ops. This allows drivers to populate a bitmap indicating all modes supported by the hardware. Update dpll_msg_add_mode_supported() to utilize this new callback: * if ops->supported_modes_get is defined, use it to retrieve the full bitmap of supported modes. * if not defined, fall back to the existing behavior: retrieve the current mode via ops->mode_get and set the corresponding bit in the bitmap. Finally, iterate over the bitmap and add a DPLL_A_MODE_SUPPORTED netlink attribute for every set bit, accurately reporting the device's capabilities to userspace. Signed-off-by: Ivan Vecera Reviewed-by: Vadim Fedorenko --- drivers/dpll/dpll_netlink.c | 27 +++++++++++++++++++-------- include/linux/dpll.h | 3 +++ 2 files changed, 22 insertions(+), 8 deletions(-) diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 64944f601ee5a..d6a0e272d7038 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -128,18 +128,29 @@ dpll_msg_add_mode_supported(struct sk_buff *msg, stru= ct dpll_device *dpll, struct netlink_ext_ack *extack) { const struct dpll_device_ops *ops =3D dpll_device_ops(dpll); + DECLARE_BITMAP(modes, DPLL_MODE_MAX + 1) =3D { 0 }; enum dpll_mode mode; int ret; =20 - /* No mode change is supported now, so the only supported mode is the - * one obtained by mode_get(). - */ + if (ops->supported_modes_get) { + ret =3D ops->supported_modes_get(dpll, dpll_priv(dpll), modes, + extack); + if (ret) + return ret; + } else { + /* If the supported modes are not reported by the driver, the + * only supported mode is the one obtained by mode_get(). + */ + ret =3D ops->mode_get(dpll, dpll_priv(dpll), &mode, extack); + if (ret) + return ret; =20 - ret =3D ops->mode_get(dpll, dpll_priv(dpll), &mode, extack); - if (ret) - return ret; - if (nla_put_u32(msg, DPLL_A_MODE_SUPPORTED, mode)) - return -EMSGSIZE; + __set_bit(mode, modes); + } + + for_each_set_bit(mode, modes, DPLL_MODE_MAX + 1) + if (nla_put_u32(msg, DPLL_A_MODE_SUPPORTED, mode)) + return -EMSGSIZE; =20 return 0; } diff --git a/include/linux/dpll.h b/include/linux/dpll.h index 562f520b23c27..912a2ca3e0ee7 100644 --- a/include/linux/dpll.h +++ b/include/linux/dpll.h @@ -20,6 +20,9 @@ struct dpll_pin_esync; struct dpll_device_ops { int (*mode_get)(const struct dpll_device *dpll, void *dpll_priv, enum dpll_mode *mode, struct netlink_ext_ack *extack); + int (*supported_modes_get)(const struct dpll_device *dpll, + void *dpll_priv, unsigned long *modes, + struct netlink_ext_ack *extack); int (*lock_status_get)(const struct dpll_device *dpll, void *dpll_priv, enum dpll_lock_status *status, enum dpll_lock_status_error *status_error, --=20 2.52.0