From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 67A7635966; Mon, 31 Mar 2025 12:44:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743425048; cv=none; b=HaG3yjKFc698M1WYbiRJkkXHRztRhvZ6YhI75jCIXDWqt02F3DDiQHD/jIFTCgDR5oAVuHWXV90S3fHCD+wq0tuB2SjOCq6/d2m4vyh88q7Nq3ESqAUcwPiCZsq7+0/m2aAFpZcP+lIhMQJNfoykAogFlSOynss5kPf4ByFUAhM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743425048; c=relaxed/simple; bh=M+Zpsq+2fQJBF4phueO5N390x+xYhEstLHKDuqJ7UAQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=iDHtXgPSuRtkOy2LLVyRmH2IqzTRSj600/24irCA5b5sO/90a2t7nZFD8dYiF7dVL24UJczIS4ocgP5b6dChzCHx3+oTHgbz1wIZUderv/oWrG5durO3zdIEkxzfWBgTpbFfjpvJ7XVABJpP2nQw7XEhDd1/fIkXZin3BgAaWDg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ry2wnQ/J; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ry2wnQ/J" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CAF01C4CEE3; Mon, 31 Mar 2025 12:44:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743425047; bh=M+Zpsq+2fQJBF4phueO5N390x+xYhEstLHKDuqJ7UAQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Ry2wnQ/JM9nkOpzz6eW2JETb66SDqhjL0XdldII2Dgg2bE9KpjsWSmutA3VqiIkT6 AvKV+rpYB5BO+XrXF+/5wTf0hgdTfX1fUjd0yCqog9yd5R7yPdSppsL1IQhRt9skVx oNMzkIgLGBwncII15H4RKbz+7naZRHCEiAnANY3dN8mtPa8veyUcifrXjW7Ei5uMYs KVsMOI42UrXJ7MifbGvmlSBuCpAU7jad2CEqSXDAuucWWLZetyDea1wLuJmPrkP/el 8FKDdynVb+b4cgY+IrwsnzUVhV4VlEQux/LZbF+i1Clr0v8vKMBSiA9+qo+N2kMzAc AB6Vz1WVHvcvw== Message-ID: <14b12882-119d-4c24-9634-e4cc37a39212@kernel.org> Date: Mon, 31 Mar 2025 14:43:59 +0200 Precedence: bulk X-Mailing-List: linux-fpga@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: fpga: zynq: Document ICAP on boot To: Sam Winchenbach Cc: linux-kernel@vger.kernel.org, mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, michal.simek@amd.com, linux-fpga@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sam Winchenbach References: <20250328141944.119504-1-sam.winchenbach@framepointer.org> <02496a88-3d9c-49ee-93ab-8f1400fc0c6b@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 31/03/2025 14:30, Sam Winchenbach wrote: >> >>> + type: boolean >>> + description: If present, the ICAP controller will be enabled when >>> + the driver probes. This is useful if the fabric is loaded >>> + during the boot process and contains a core, such as the SEM, >> >> I don't get how this is suitable for DT. If you decide to load the >> fabric from driver, that's driver decision so not DT. > > Before writing the fabric to the FPGA the driver disables the ICAP, enabling > the PCAP. Once writing is complete it unconditionally disables the PCAP, > enabling the ICAP. This patch just makes it so, depending on the use case, > the ICAP can be enabled at boot. This will not prevent the system from being > able to load a fabric through the driver. I added in this boolean so existing > behavior would be maintained. > > Do you recommend another approach such as writing to a sysfs attribute to > switch from PCAP to ICAP? Not sure yet. Can't you check the status of ICAP before programming and then enable it only if was enabled before? Best regards, Krzysztof