From patchwork Thu Sep 3 15:04:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Satya Priya X-Patchwork-Id: 11753975 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E39FD1575 for ; Thu, 3 Sep 2020 15:08:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D18C12072A for ; Thu, 3 Sep 2020 15:08:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729049AbgICPHb (ORCPT ); Thu, 3 Sep 2020 11:07:31 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:45300 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729499AbgICPFi (ORCPT ); Thu, 3 Sep 2020 11:05:38 -0400 Received: from ironmsg07-lv.qualcomm.com (HELO ironmsg07-lv.qulacomm.com) ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 03 Sep 2020 08:05:34 -0700 Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg07-lv.qulacomm.com with ESMTP/TLS/AES256-SHA; 03 Sep 2020 08:05:32 -0700 Received: from c-skakit-linux.ap.qualcomm.com (HELO c-skakit-linux.qualcomm.com) ([10.242.51.242]) by ironmsg02-blr.qualcomm.com with ESMTP; 03 Sep 2020 20:35:05 +0530 Received: by c-skakit-linux.qualcomm.com (Postfix, from userid 2344709) id CE84C44AA; Thu, 3 Sep 2020 20:35:04 +0530 (IST) From: satya priya To: Bjorn Andersson Cc: Matthias Kaehlcke , gregkh@linuxfoundation.org, Andy Gross , Rob Herring , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, akashast@codeaurora.org, rojay@codeaurora.org, msavaliy@qti.qualcomm.com, satya priya Subject: [PATCH V4 3/4] arm64: dts: qcom: sc7180: Add sleep state for BT UART Date: Thu, 3 Sep 2020 20:34:57 +0530 Message-Id: <1599145498-20707-4-git-send-email-skakit@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599145498-20707-1-git-send-email-skakit@codeaurora.org> References: <1599145498-20707-1-git-send-email-skakit@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add sleep state for BT uart to support the wakeup feature. Signed-off-by: satya priya Reviewed-by: Akash Asthana Reviewed-by: Matthias Kaehlcke --- Changes in V2: - This patch adds sleep state for BT UART. Newly added in V2. Changes in V3: - Remove "output-high" for TX from both sleep and default states as it is not required. Configure pull-up for TX in sleep state. Changes in V4: - As per Matthias's comment, removed drive-strength for sleep state and fixed nit-pick. arch/arm64/boot/dts/qcom/sc7180-idp.dts | 37 +++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts index cecac3e..77e3523 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts @@ -507,6 +507,43 @@ }; }; +&qup_uart3_sleep { + pinconf-cts { + /* + * Configure no-pull on CTS. As this is driven by BT, do not + * specify any pull in order to not conflict with BT pulls. + */ + pins = "gpio38"; + bias-disable; + }; + + pinconf-rts { + /* + * Configure pull-down on RTS to make sure that the BT SoC can + * wake up the system by sending wakeup bytes during suspend. + */ + pins = "gpio39"; + bias-pull-down; + }; + + pinconf-tx { + /* Configure pull-up on TX when it isn't actively driven */ + pins = "gpio40"; + bias-pull-up; + }; + + pinconf-rx { + /* + * Configure a pull-up on RX. This is needed to avoid + * garbage data when the TX pin of the Bluetooth module is + * in tri-state (module powered off or not driving the + * signal yet). + */ + pins = "gpio41"; + bias-pull-up; + }; +}; + &qup_uart8_default { pinconf-tx { pins = "gpio44";