From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1521079488; cv=none; d=google.com; s=arc-20160816; b=IlToyUd8E3cT41XHOtRIO/wYZ+PMBY+yA7sRmCwzbdCkuypmjFm6gLUSgDqOBjFgp/ ErZDiHFnII7o+9B7nwqEQNOLF7EGLlV+HkgqQOdKXC+KDsMU9vkyRn18JHkGEruRuuA1 8SLZzta5xeyFquvwaZVyisv5ux6UkT7EPlxa7bZV2bdlhJkKGPE/lqlAJ2KyIOLE6vxx gLX8M2Del/rhvpvNShCzf6RBHtjz2CfQB+pL/QJkqWLDdqXP1Y+4BxFG6cFUxH1tcYCG 02PrUcQ/txNZNsdtitLeXYdO+/FIYGQEcMCCY5tRqLAa4kXJ1rKvVDgsGTRWERzLqUuu TUoQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:date:subject:cc:to:from:dkim-signature :arc-authentication-results; bh=nrvySmGlEuEePiWNYfaGy0dGhn1+zLZNjC4iKX59MTk=; b=wFYZbBAzWPfwiIczh1T2nB8eUWmp3ERPTV9R8Tivmnp0OsVNLUY8MhcgB80DIybrfh Ghn8zwe9jiYJ6BWSw6eN10BPwgv1t+U1mtySbUm1RAgRL82g6hZcImEbwAVxs/8gWbt1 AaqDubNdXuD/6jS5d8xeoshA279WmUEN3hMM1r5uwt4z66VQcD9iW0AjwxFPQtI8E1/3 oiyTMi3o/q1k934gUhczx3abZp7PBNEcA38uSn+rnr0IBr5XpyqDcChacNnkVWD6XU26 uYLUA+Uq6iVbeyPqA4+q/n+hmDjybNPYVBUfHXr4PDac1OHixrlv21lrhKbWbZI2cVgw mVnQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=Fzl/0jpe; spf=pass (google.com: domain of djkurtz@chromium.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=djkurtz@chromium.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=Fzl/0jpe; spf=pass (google.com: domain of djkurtz@chromium.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=djkurtz@chromium.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org X-Google-Smtp-Source: AG47ELu+FV3e4N4PXVlWjExlcnjJsm8s9UpvT9LPdBCMvOZzTLeC8AcIGCVmVS9zBoMrKGHgwB1dzQ== From: Daniel Kurtz To: Greg Kroah-Hartman Cc: adurbin@chromium.org, linux-kernel@vger.kernel.org, Daniel Kurtz Subject: [PATCH v3 0/3] Add earlycon support for AMD Carrizo / Stoneyridge Date: Wed, 14 Mar 2018 20:04:42 -0600 Message-Id: <20180315020445.150604-1-djkurtz@chromium.org> X-Mailer: git-send-email 2.16.2.804.g6dcf76e118-goog X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1594951091006511765?= X-GMAIL-MSGID: =?utf-8?q?1594967445229527777?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: AMD Carrizo / Stoneyridge use a DesignWare 8250 UART that uses a 48 MHz input clock. Currently, there is no way to tell earlycon to use a specific uart input clock when configuring a baud rate. Patch 1 adds an earlycon ->setup() callback to set up this clock. The setup is triggered on the commandline by specifying "earlycon=amdcz,...". Patch 2 adds an ACPI SPCR quirk to automatically trigger this hook when the ACPI SPCR table OEMID field is "AMDCZ ". Patch 3 adds an additional fix which allows botht the ACPI SPCR quirk and amdcz ->setup() to tell 8250_core to skip initialization of old serial ports that do not exist on these SoCs. Daniel Kurtz (3): serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge ACPI: SPCR: Add support for AMD CT/SZ serial: core: Allow skipping old serial port initialization drivers/acpi/spcr.c | 26 ++++++++++++++++++++++++++ drivers/tty/serial/8250/8250_core.c | 6 ++++++ drivers/tty/serial/8250/8250_early.c | 16 ++++++++++++++++ include/linux/serial_8250.h | 2 ++ 4 files changed, 50 insertions(+) -- 2.16.2.804.g6dcf76e118-goog