Received: by 2002:a05:6a10:f3d0:0:0:0:0 with SMTP id a16csp1387938pxv; Fri, 2 Jul 2021 02:33:01 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxdKuH7NtyzqY16RT5ufOwVtYLznG9nMqHrko4ZJvO0IBnjat5tQaiu4RVzCInk1DgkIC1Y X-Received: by 2002:a17:906:3042:: with SMTP id d2mr4513801ejd.234.1625218381092; Fri, 02 Jul 2021 02:33:01 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1625218381; cv=none; d=google.com; s=arc-20160816; b=Fy/v/PYFrBIN/C5Y2PecsCCwkyu7z8iNfaeFbC9n2IXw4Iucv2Z8T2uBuY0Zgr1j/n 62xEDWx254Ojsiv3UNxC2FWny7oSX2Lfva16lW40PhMZOwNXx3qw4rFaOFSkWf4RcEBG vJjFiN3NgAyogND38OrUJRRffAo1hxKtykefo1cyu1HC32Px7PeRbWhtpqMYz8e3H5lG HcNWQOqcp2txhu8T6v9JV9A0XQP9kgjWhG65VMfR9Hd2f7oWWo9ryikgR4abjNcf0kEU 7rF3Kecw3GzD/PFl1DsGEN0iCcA7mhCFHmAZhoPCOYm3xXWiB/wbbdec88K7EZrzDiCR NnBw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from; bh=VTtSrN50usgGzHTqtAiYWBgCyU3h9r8rYFU+/kulPlc=; b=ZcHQaS3KvBidSIfYScnZb0YMjM6MRYYNiIxLVnucQLCwF2oHb8yuQ/QH/57N1Pt80J BpVZ1cQzErGcJ24HaIkz3WGiIWvKcuoeVb6sCFBlQG6qYcs9TniqeYSNacDfYDv3DQ94 /+xaa0ctaHmcUu26w9GhFbidAdV0MgB81mJcAVrwbUJ6+b28eUqGH9vhMa/LsLEyoWRF 0mCm+F0AWOsyExxp3GuPp87N7qIlPYamSNXol9325bk1A/9VuIKX2Hf/erILAXpRYX+P tuw4Ul7ASiORe1YXOA4aCGS836GPXN9xZwl0Jera2XKGOOOvmxrZjMRBNzv1HfruOnLo 8AwA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=mediatek.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id n12si2481060edx.350.2021.07.02.02.32.38; Fri, 02 Jul 2021 02:33:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=mediatek.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231241AbhGBJbL (ORCPT + 99 others); Fri, 2 Jul 2021 05:31:11 -0400 Received: from mailgw01.mediatek.com ([60.244.123.138]:53699 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S230476AbhGBJbL (ORCPT ); Fri, 2 Jul 2021 05:31:11 -0400 X-UUID: 8cdbb4eeab4a42d79d2acc5f97a00b58-20210702 X-UUID: 8cdbb4eeab4a42d79d2acc5f97a00b58-20210702 Received: from mtkcas06.mediatek.inc [(172.21.101.30)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 734400183; Fri, 02 Jul 2021 17:28:35 +0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs01n2.mediatek.inc (172.21.101.79) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 2 Jul 2021 17:28:34 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 2 Jul 2021 17:28:34 +0800 From: YP WU To: CC: , , , , , , , , Subject: Re: How to use "DTV_FE_CAPABILITY" command for Frontend.h of Linux DVB Date: Fri, 2 Jul 2021 17:28:34 +0800 Message-ID: <20210702092834.11699-1-yp.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210623093312.6f9883a5@coco.lan> References: <20210623093312.6f9883a5@coco.lan> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Mr.Mauro, About use case, I describe below: For our design of kernel, demod/tuner and LNB are registered to different frontend device nodes. We want to implement property command to know if the frontend device node is LNB device or demod/tuner device. If it is LNB device node, the value would return true If it is demod/tuner device node, the value would return false. Do you have better idea or suggestion for our usage? Please let me know if your have better suggestion. Very thank you for your help. BRs, YP