From patchwork Mon Jun 13 23:04:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 9174667 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E4C1A6075D for ; Mon, 13 Jun 2016 23:08:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D650826861 for ; Mon, 13 Jun 2016 23:08:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CB0602723E; Mon, 13 Jun 2016 23:08:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8C63726861 for ; Mon, 13 Jun 2016 23:08:24 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1bCawX-0005mC-Gm; Mon, 13 Jun 2016 23:06:53 +0000 Received: from mail-pf0-x22f.google.com ([2607:f8b0:400e:c00::22f]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1bCav3-0003Lo-AX for linux-arm-kernel@lists.infradead.org; Mon, 13 Jun 2016 23:05:23 +0000 Received: by mail-pf0-x22f.google.com with SMTP id 62so50524700pfd.1 for ; Mon, 13 Jun 2016 16:05:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=7Rzht7g4n/p0IPbEZHI/HJf0YaX7OgzpEWKTz/Kj7ag=; b=jvr6qsIrO1Sk6EUyHuCT63QSXt8n2uXH1lz57xQGIwTSayd2bbLQgyjH/C26x1wte5 2ycUjK1CT2ZSm9/jYs4bivRD79Gkp1d05oxpFLfgqmIp2g8pOPNlUhK4hO03wE/gt7O3 33ArQ0RYCDljf4Kr9xDaUCXdfqOnzJgq4+wCs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=7Rzht7g4n/p0IPbEZHI/HJf0YaX7OgzpEWKTz/Kj7ag=; b=igJ5T0fmyjVxmgD6b3G+eBbsbjG88eGoEnwuOS5+Q3bNT7aGWXt5YdndWAn956maTb /0BEmBRMLEKtJSbIeQN6xna6wmBG9ZNNsS1eEH8o7zAJKV/Hgp5B/H1itOPVaA1Xast+ kQIJ1Fk/FSuceym+V4AVSX4T6rMzefVq0+ZUlK66K3SNlFtsppr+BxoqIDu4pQCfTui1 ULY7a2VUwaEH0SJsbkxWu8sIgDVBzARDPR0gMy9Gqg/UxV/+JmU9MaEaumUlqyB/8b2J 6R3phvk7MdbTo36nea/DjNeDRl6PitR8cjbbzK18AZQq4KwnCWnZX2X1ckrQir4b1io3 qlUQ== X-Gm-Message-State: ALyK8tJdvcOjnEq76HjVdlw8EGVyfciLL4O7u3uIzdUYuX4N7ypBr3o3OFZoYCm4X7nO4H5K X-Received: by 10.98.26.148 with SMTP id a142mr13929589pfa.46.1465859102618; Mon, 13 Jun 2016 16:05:02 -0700 (PDT) Received: from tictac.mtv.corp.google.com ([172.22.65.76]) by smtp.gmail.com with ESMTPSA id pk18sm8906434pab.27.2016.06.13.16.05.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 13 Jun 2016 16:05:01 -0700 (PDT) From: Douglas Anderson To: ulf.hansson@linaro.org, kishon@ti.com, Heiko Stuebner , robh+dt@kernel.org Subject: [PATCH v2 08/11] Documentation: phy: Let the rockchip eMMC PHY get an exported card clock Date: Mon, 13 Jun 2016 16:04:32 -0700 Message-Id: <1465859076-4868-9-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 2.8.0.rc3.226.g39d4020 In-Reply-To: <1465859076-4868-1-git-send-email-dianders@chromium.org> References: <1465859076-4868-1-git-send-email-dianders@chromium.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160613_160521_567251_6890808A X-CRM114-Status: GOOD ( 12.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, xzy.xu@rock-chips.com, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, linux-kernel@vger.kernel.org, shawn.lin@rock-chips.com, briannorris@chromium.org, linux-mmc@vger.kernel.org, adrian.hunter@intel.com, Douglas Anderson , linux-rockchip@lists.infradead.org, galak@codeaurora.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP As of an earlier change in this series ("Documentation: mmc: sdhci-of-arasan: Add ability to export card clock") the SDHCI driver used on Rockchip SoCs can now expose its clock. Let's now specify that the PHY can use it. Letting the PHY get access to this clock means it can adjust phyctrl_frqsel field appropriately. Although the Rockchip PHY appears slightly different than the reference Arasan one, you can see that the Arasan datasheet [1] had it defined as: Select the frequency range of DLL operation: 3b'000 => 200MHz to 170 MHz 3b'001 => 170MHz to 140 MHz 3b'010 => 140MHz to 110 MHz 3b'011 => 110MHz to 80MHz 3b'100 => 80MHz to 50 MHz 3b'101 => 275Mhz to 250MHz 3b'110 => 250MHz to 225MHz 3b'111 => 225MHz to 200MHz On the Rockchip version of the PHY we have less granularity but the idea is the same. [1]: https://arasan.com/wp-content/media/eMMC-5-1-Total-Solution_Rev-1-3.pdf Signed-off-by: Douglas Anderson Acked-by: Rob Herring Reviewed-by: Heiko Stuebner Acked-by: Kishon Vijay Abraham I --- Changes in v2: - List out clocks and clock names (Rob) Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt index 555cb0f40690..e3ea55763b0a 100644 --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt +++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt @@ -7,6 +7,13 @@ Required properties: - reg: PHY register address offset and length in "general register files" +Optional clocks using the clock bindings (see ../clock/clock-bindings.txt), +specified by name: + - clock-names: Should contain "emmcclk". Although this is listed as optional + (because most boards can get basic functionality without having + access to it), it is strongly suggested. + - clocks: Should have a phandle to the card clock exported by the SDHCI driver. + Example: @@ -20,6 +27,8 @@ grf: syscon@ff770000 { emmcphy: phy@f780 { compatible = "rockchip,rk3399-emmc-phy"; reg = <0xf780 0x20>; + clocks = <&sdhci>; + clock-names = "emmcclk"; #phy-cells = <0>; }; };