From patchwork Tue Apr 16 19:06:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 13632420 Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (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 A6221137769; Tue, 16 Apr 2024 19:08:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.15.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713294494; cv=none; b=uHW+ZpgXE3WU401T4Xh9qf4FtvxGJ5ZAbOPPg02Pim50uPFv9pwZLMXKnqASbjoxdNDxWIb+UuEa1RNukzakICzW/FPFcxnaSE191w6+DNGzAcTAtURwvaizVrPtiVytTJGq382Iq2QKswlVMb/3x+3v93XbQ7BArU+gVO4dxJ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713294494; c=relaxed/simple; bh=PEe85yDrpJfP9064T54tsddkdL+XKVlLAq1PSTbFBu0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jwo8bEJWK4GMscKXWS0HxRwmXNr/avff09gbZYcJ1pc4WDnL0nX6JmC/wvvmkRaBNYfYNZCZwPaIO4dbuJVYcp+79DPHFSo2R03ljQR11B0VTZRRUQ4P366ymyXfsFvuLpi9+fb7PILvKxYqlMqshfa27NY7Rf2a9aMPjE1nszE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.net; spf=pass smtp.mailfrom=gmx.net; dkim=pass (2048-bit key) header.d=gmx.net header.i=wahrenst@gmx.net header.b=LSXatYpj; arc=none smtp.client-ip=212.227.15.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmx.net header.i=wahrenst@gmx.net header.b="LSXatYpj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.net; s=s31663417; t=1713294453; x=1713899253; i=wahrenst@gmx.net; bh=6eNTH1NR9UJkd8glrTCGvxeQETtqM7WHOX7C0LGv91Q=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:Message-Id:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding:cc: content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=LSXatYpj0X41WdiiI8nWaFNPmv8so47bbX07gS+1IKSLkpPkPSgUJE2nNLEwJ1z4 cGVwz4MN5NF01hBVx1DqwxhtiW4QmsiT3UD4L6T1xUNh45qmwlQPscfNiz8B9ie7h 5yx20dpjirNjObupSNo2t6ZAcOkpcbM4ufmDscKGZ+My7fiVvb+C6PDMTR2gNx0gS IKubGTDRE14ROXxKmBXCTzm56OcCQT8SCIRUWYfVlkQG7DZllavJHsIBa4R/0yvBu 6YMWrvU8Yz9vsliNxynHIhnHUzmRfDc1BbLUAmNZZA2JxvYBuMJEt3Fiphu+Km8oM 7nKVRwfUxWri9F5dxg== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from stefanw-SCHENKER ([37.4.248.43]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MY6Cl-1sFkhV3t77-00YR9V; Tue, 16 Apr 2024 21:07:33 +0200 From: Stefan Wahren To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Fabio Estevam Cc: kernel@pengutronix.de, imx@lists.linux.dev, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Wahren Subject: [PATCH 2/2] ARM: dts: imx6ull-tarragon: Reduce SPI clock for QCA7000 Date: Tue, 16 Apr 2024 21:06:59 +0200 Message-Id: <20240416190659.15430-3-wahrenst@gmx.net> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240416190659.15430-1-wahrenst@gmx.net> References: <20240416190659.15430-1-wahrenst@gmx.net> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Provags-ID: V03:K1:96kVfHWmqmisRl4AuStm+7j2jSg2AZu8uqGwvwbHNmC8+U0X6V4 X4GGrPk1yOlmiFWM1YPkiUX7jizP5IX1BQC8Gd3bbPtcUZcJby0TinIUprr2rs7FjtoCpdR 0sti3eHtIa84GwHI8sWBR4oj0MigZ6ZYcAWtLtgwZB7IbqQb/3Uk2CQRtLgSRYfVqxcjixA S5s7o2ITD5Ot51k6eOpIg== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:5Iw0jdwG3GI=;7+ygiubD9LS+ohSgeMnPbuWM6g6 VZzd2P9SjuPATGrLuHZ5Z7/NQ57YUgO5larn4JmbbgBbjcET0U+EiEYTZG8dwe1ZZa4/dd+D2 YtJG7a9vDHNOSVbBIqCBFzzAfkYtnNkGsIbgLPX1v2dkkBczKneEA1VFPp1SSuzDGwn+RJCdI cLh0s2jzU+v1yuQ4gSNe0lml7XtUhghtuzGjhNcYLx9+R4b8u9S8FFoDvB/nt0ub6amgj7N5y n/3vt8i13HzVbse8PYvoAboPFIhTc+MtbbN4Roay41XMyUguEGeeUD/Rz7gv6qfP3rGXL2BCr 4yCqtHcvEk4npIwNoB9QWluT0nCQmmJv1Xy1R59/X1xeUtYgnsS3latlfYvChkIwEeWz7sIor M7dEYf4FbH/M3uTKgFDsG4daXEMwbsZ4ODqHJRZTNbvef245TvJZCUdcWhToLg2slE/bCTRKE hOT9GBS2+0jxQgTWqkzV0ty2NJ+vfdyqx8JADm39AlQmz/PDY45oPX2ocIjAf4828vpg6YOgA Io6czD4H7Y0pdmY/FwJ7yMfK1299PeAPud/SuEZt3VGzSy7P5itbmW/LNLr8UOk157CJKImhv oqOeG0bCSjv3d67OZ/xzjXisQW+tIlwAW0iZKg0o+0/ZKOYTI/ei+eAsbuwfXD5MHqIaZTbhi XM7Eiv8QX88eo7AC6WcmkSsGTIx2MQkTZ33mVrUpe7WH66bB1ZQijJFa0+38fivjscWOSDZzJ fSjqgWAWAgQtm7DXkxBiGWv593p9deCnt2HIpY9rIyxACb0rENPHOXXBDLiev0BLppNfHwgNh xEbMCXtIXf39UkFBMMNQtUnpqjnoLE6gyR8b0zw/QlkSc= Our hardware department recently informed us that, according to the specification, the QCA7000 should be operated with a maximum SPI clock frequency of 12 MHz. Even if it appears to work at a higher frequency, we should not take any risks here. A short performance test showed no measurable loss of speed. Signed-off-by: Stefan Wahren --- arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts | 4 ++-- arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts | 2 +- arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) -- 2.34.1 diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts index 67007ce383e3..f9bbd589b66d 100644 --- a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts +++ b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts @@ -45,7 +45,7 @@ &pinctrl_qca700x_cp_rst interrupts = <19 IRQ_TYPE_EDGE_RISING>; spi-cpha; spi-cpol; - spi-max-frequency = <16000000>; + spi-max-frequency = <12000000>; }; }; @@ -63,7 +63,7 @@ &pinctrl_qca700x_mains_rst interrupts = <9 IRQ_TYPE_EDGE_RISING>; spi-cpha; spi-cpol; - spi-max-frequency = <16000000>; + spi-max-frequency = <12000000>; }; }; diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts index cee223b5f8e1..ef06619d7c86 100644 --- a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts +++ b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts @@ -23,7 +23,7 @@ &pinctrl_qca700x_cp_rst interrupts = <19 IRQ_TYPE_EDGE_RISING>; spi-cpha; spi-cpol; - spi-max-frequency = <16000000>; + spi-max-frequency = <12000000>; }; }; diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts index 7fd53b7a4372..83db65bf630f 100644 --- a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts +++ b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts @@ -45,7 +45,7 @@ &pinctrl_qca700x_cp_rst interrupts = <19 IRQ_TYPE_EDGE_RISING>; spi-cpha; spi-cpol; - spi-max-frequency = <16000000>; + spi-max-frequency = <12000000>; }; };