From patchwork Thu Jun 24 22:49:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 466664 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61494C49EAF for ; Thu, 24 Jun 2021 22:50:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B91F613BD for ; Thu, 24 Jun 2021 22:50:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232947AbhFXWw0 (ORCPT ); Thu, 24 Jun 2021 18:52:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:54716 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232902AbhFXWwT (ORCPT ); Thu, 24 Jun 2021 18:52:19 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id CC598613B9; Thu, 24 Jun 2021 22:49:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624575000; bh=Nu54X5q0A7lAD3PI/6jbtY+Y1bhEuC3ltNWvMu7bpzI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SRagiruW29xLKKXfgO2H7UkcNehLrYafQfO8xUhgfFO6F49jXYkgn0xZgUpVfmpEX 7yZxgcuA3vSsxOF+FrscSjcTWEfO1sYrxYqmr75gC55SvA59VufkkS9RnmmUNCn8F6 jYPyqEz/Nj1b7u6J507V5bRVCUZsGbDgZT8NIMwhb0by1UZqdf9w9OJlGCqSZ93rrT FQC14ltLoEFJdJ6Pio0ZokpNw8VV5z3tmg618b2ZkMxRdOifZDXpxPGepfHvPumu1+ 3rTxAjrdSBn7sg/4lA3ZMyWDTQqGk6X70CjERNjCINu+6tVW7NUYv8diRxgTSVfOJp 3ntYRYEYs4reQ== Received: by pali.im (Postfix) id 897E78A3; Fri, 25 Jun 2021 00:49:59 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Michael Turquette , Stephen Boyd , Rob Herring , Greg Kroah-Hartman Cc: Andrew Lunn , Gregory Clement , Sebastian Hesselbarth , Vladimir Vid , =?utf-8?q?Marek_Beh=C3=BAn?= , linux-clk@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 08/10] dt-bindings: mvebu-uart: document DT bindings for marvell, armada-3700-uart-clock Date: Fri, 25 Jun 2021 00:49:07 +0200 Message-Id: <20210624224909.6350-9-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210624224909.6350-1-pali@kernel.org> References: <20210624224909.6350-1-pali@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org This change adds DT bindings documentation for device nodes with compatible string "marvell,armada-3700-uart-clock". Signed-off-by: Pali Rohár --- .../bindings/clock/armada3700-uart-clock.txt | 24 +++++++++++++++++++ .../devicetree/bindings/serial/mvebu-uart.txt | 9 ++++--- 2 files changed, 30 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/clock/armada3700-uart-clock.txt diff --git a/Documentation/devicetree/bindings/clock/armada3700-uart-clock.txt b/Documentation/devicetree/bindings/clock/armada3700-uart-clock.txt new file mode 100644 index 000000000000..144bc6d7eae8 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/armada3700-uart-clock.txt @@ -0,0 +1,24 @@ +* Marvell Armada 3720 UART clocks + +Required properties: +- compatible: "marvell,armada-3700-uart-clock" +- reg: two 4-bytes registers: UART Clock Control and UART 2 Baud Rate Divisor +- #clock-cells : from common clock binding; shall be set to 1 +- clocks: List of parent clocks suitable for UART from following set: + "TBG-A-P", "TBG-B-P", "TBG-A-S", "TBG-B-S", "xtal" + UART clock can use one from this set and when more are provided + then kernel would choose and configure the most suitable one. + It is suggest to specify at least one TBG clock to achieve + baudrates above 230400 and also to specify clock which bootloader + used for UART (most probably xtal) for smooth boot log on UART. + +Example: + uartclk: uartclk@12000 { + compatible = "marvell,armada-3700-uart-clock"; + reg = <0x12010 0x4>, <0x12210 0x4>; + clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>, + <&tbg 3>, <&xtalclk>; + clock-names = "TBG-A-P", "TBG-B-P", "TBG-A-S", + "TBG-B-S", "xtal"; + #clock-cells = <1>; + }; diff --git a/Documentation/devicetree/bindings/serial/mvebu-uart.txt b/Documentation/devicetree/bindings/serial/mvebu-uart.txt index 2d0dbdf32d1d..463968e7e7f3 100644 --- a/Documentation/devicetree/bindings/serial/mvebu-uart.txt +++ b/Documentation/devicetree/bindings/serial/mvebu-uart.txt @@ -14,7 +14,10 @@ Required properties: is provided (possible only with the "marvell,armada-3700-uart" compatible string for backward compatibility), it will only work if the baudrate was initialized by the bootloader and no baudrate - change will then be possible. + change will then be possible. When provided it should be UART1-clk + for standard variant of UART and UART2-clk for extended variant + of UART. TBG clock (with TBG divisors d1=d2=1) or xtal clock should + not be used and are supported only for backward compatibility. - interrupts: - Must contain three elements for the standard variant of the IP (marvell,armada-3700-uart): "uart-sum", "uart-tx" and "uart-rx", @@ -34,7 +37,7 @@ Example: uart0: serial@12000 { compatible = "marvell,armada-3700-uart"; reg = <0x12000 0x18>; - clocks = <&xtalclk>; + clocks = <&uartclk 0>; interrupts = , , @@ -45,7 +48,7 @@ Example: uart1: serial@12200 { compatible = "marvell,armada-3700-uart-ext"; reg = <0x12200 0x30>; - clocks = <&xtalclk>; + clocks = <&uartclk 1>; interrupts = , ;