From patchwork Sun Jan 6 23:31:57 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 13848 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 0A11423E2E for ; Sun, 6 Jan 2013 23:32:19 +0000 (UTC) Received: from mail-vb0-f47.google.com (mail-vb0-f47.google.com [209.85.212.47]) by fiordland.canonical.com (Postfix) with ESMTP id A406EA189FD for ; Sun, 6 Jan 2013 23:32:18 +0000 (UTC) Received: by mail-vb0-f47.google.com with SMTP id e21so18392980vbm.20 for ; Sun, 06 Jan 2013 15:32:18 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:x-forwarded-to:x-forwarded-for:delivered-to:x-received :received-spf:from:to:cc:subject:date:message-id:x-mailer :mime-version:content-type:x-gm-message-state; bh=WhtxjeLoS7LVIXCgdUtfpkTvIeG+XAsOe4Igu0Dooms=; b=bkdK3EtKuXvntul+WfotSVT44MiO+bO9b3ZtqCk3OYjm9YM3wem8J2mpPTyOsIYN9e KpYxmn/kjnSGV3RdaRo0MIQ8gpoZ2z9ML3GZG1IYHywl+GZZ0JyTmSh755VwRUKdo2Eb Zq7TwgtNCQdzPJgGXxr4d6QRs122O7lclc1JyePY8y8MPCckmBbVJiQZtLu+7hGSpHlc q/AQWQ6CLnVmZ8eGQ3zTjuGlnJTwfA5T1YoT71YxLi2sR+JmESZQUPDeZfcSQTF8SBHW ZEGOg4dVWHbD8D1gfC+iNb8AXhDe58hhtsXEb/MY74A3V1jbtMzfsmr4twWYIGfpgQ7z efnA== X-Received: by 10.52.18.147 with SMTP id w19mr71354263vdd.94.1357515138132; Sun, 06 Jan 2013 15:32:18 -0800 (PST) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.58.145.101 with SMTP id st5csp38385veb; Sun, 6 Jan 2013 15:32:17 -0800 (PST) X-Received: by 10.14.204.70 with SMTP id g46mr136650467eeo.15.1357515136504; Sun, 06 Jan 2013 15:32:16 -0800 (PST) Received: from eu1sys200aog117.obsmtp.com (eu1sys200aog117.obsmtp.com [207.126.144.143]) by mx.google.com with SMTP id w41si153164084een.40.2013.01.06.15.32.11 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 06 Jan 2013 15:32:16 -0800 (PST) Received-SPF: neutral (google.com: 207.126.144.143 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) client-ip=207.126.144.143; Authentication-Results: mx.google.com; spf=neutral (google.com: 207.126.144.143 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) smtp.mail=linus.walleij@stericsson.com Received: from beta.dmz-ap.st.com ([138.198.100.35]) (using TLSv1) by eu1sys200aob117.postini.com ([207.126.147.11]) with SMTP ID DSNKUOoJemm4Ae+MU++O3nqxp4gwgXTk/6Xf@postini.com; Sun, 06 Jan 2013 23:32:16 UTC Received: from zeta.dmz-ap.st.com (ns6.st.com [138.198.234.13]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id BCD31D5; Sun, 6 Jan 2013 23:23:55 +0000 (GMT) Received: from relay2.stm.gmessaging.net (unknown [10.230.100.18]) by zeta.dmz-ap.st.com (STMicroelectronics) with ESMTP id A5233AB4; Sun, 6 Jan 2013 23:32:04 +0000 (GMT) Received: from exdcvycastm022.EQ1STM.local (alteon-source-exch [10.230.100.61]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (Client CN "exdcvycastm022", Issuer "exdcvycastm022" (not verified)) by relay2.stm.gmessaging.net (Postfix) with ESMTPS id BDB10A8093; Mon, 7 Jan 2013 00:32:03 +0100 (CET) Received: from steludxu4075.lud.stericsson.com (10.230.100.153) by smtp.stericsson.com (10.230.100.30) with Microsoft SMTP Server (TLS) id 8.3.83.0; Mon, 7 Jan 2013 00:32:02 +0100 From: Linus Walleij To: Ben Dooks , Wolfram Sang , Cc: Anmar Oueja , Patrice Chotard , Linus Walleij Subject: [PATCH] i2c: nomadik: adopt pinctrl support Date: Mon, 7 Jan 2013 00:31:57 +0100 Message-ID: <1357515117-21992-1-git-send-email-linus.walleij@stericsson.com> X-Mailer: git-send-email 1.7.11.3 MIME-Version: 1.0 X-Gm-Message-State: ALoCoQmJs2PIzNcVXEXLiFgYAmEFI/3GxugWyIjXgJ6JzDLMv9qNacHMvOLB1ISSSsygHBjQdUNA From: Patrice Chotard Amend the I2C nomadik pin controller to optionally take a pin control handle and set the state of the pins to: - "default" on boot, resume and before performing an i2c transfer - "idle" after initial default, after resume default, and after each i2c xfer - "sleep" on suspend() This should make it possible to optimize energy usage for the pins both for the suspend/resume cycle, and for runtime cases inbetween I2C transfers. Signed-off-by: Patrice Chotard Signed-off-by: Linus Walleij --- ChangeLog v3->v4: - Rebase onto v3.8-rc2 ChangeLog v2->v3: - Rebase on top of the patch from Philippe/Ulf. ChangeLog v1->v2: - We used only two states initially: default and sleep. It turns out you can save some energy when idling (between transfers) and even more when suspending on our platform, so grab all three states and use them as applicable. --- drivers/i2c/busses/i2c-nomadik.c | 92 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c index 8b2ffcf..8a5168a 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -26,6 +26,7 @@ #include #include #include +#include #define DRIVER_NAME "nmk-i2c" @@ -147,6 +148,10 @@ struct i2c_nmk_client { * @stop: stop condition. * @xfer_complete: acknowledge completion for a I2C message. * @result: controller propogated result. + * @pinctrl: pinctrl handle. + * @pins_default: default state for the pins. + * @pins_idle: idle state for the pins. + * @pins_sleep: sleep state for the pins. * @busy: Busy doing transfer. */ struct nmk_i2c_dev { @@ -160,6 +165,11 @@ struct nmk_i2c_dev { int stop; struct completion xfer_complete; int result; + /* Three pin states - default, idle & sleep */ + struct pinctrl *pinctrl; + struct pinctrl_state *pins_default; + struct pinctrl_state *pins_idle; + struct pinctrl_state *pins_sleep; bool busy; }; @@ -636,6 +646,15 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap, goto out_clk; } + /* Optionaly enable pins to be muxed in and configured */ + if (!IS_ERR(dev->pins_default)) { + status = pinctrl_select_state(dev->pinctrl, + dev->pins_default); + if (status) + dev_err(&dev->adev->dev, + "could not set default pins\n"); + } + status = init_hw(dev); if (status) goto out; @@ -663,6 +682,15 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap, out: clk_disable_unprepare(dev->clk); out_clk: + /* Optionally let pins go into idle state */ + if (!IS_ERR(dev->pins_idle)) { + status = pinctrl_select_state(dev->pinctrl, + dev->pins_idle); + if (status) + dev_err(&dev->adev->dev, + "could not set pins to idle state\n"); + } + pm_runtime_put_sync(&dev->adev->dev); dev->busy = false; @@ -857,15 +885,44 @@ static int nmk_i2c_suspend(struct device *dev) { struct amba_device *adev = to_amba_device(dev); struct nmk_i2c_dev *nmk_i2c = amba_get_drvdata(adev); + int ret; if (nmk_i2c->busy) return -EBUSY; + if (!IS_ERR(nmk_i2c->pins_sleep)) { + ret = pinctrl_select_state(nmk_i2c->pinctrl, + nmk_i2c->pins_sleep); + if (ret) + dev_err(dev, + "could not set pins to sleep state\n"); + } + return 0; } static int nmk_i2c_resume(struct device *dev) { + struct amba_device *adev = to_amba_device(dev); + struct nmk_i2c_dev *nmk_i2c = amba_get_drvdata(adev); + int ret; + + /* First go to the default state */ + if (!IS_ERR(nmk_i2c->pins_default)) { + ret = pinctrl_select_state(nmk_i2c->pinctrl, + nmk_i2c->pins_default); + if (ret) + dev_err(dev, + "could not set pins to default state\n"); + } + /* Then let's idle the pins until the next transfer happens */ + if (!IS_ERR(nmk_i2c->pins_idle)) { + ret = pinctrl_select_state(nmk_i2c->pinctrl, + nmk_i2c->pins_idle); + if (ret) + dev_err(dev, + "could not set pins to idle state\n"); + } return 0; } #else @@ -953,6 +1010,40 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) dev->adev = adev; amba_set_drvdata(adev, dev); + dev->pinctrl = devm_pinctrl_get(&adev->dev); + if (IS_ERR(dev->pinctrl)) { + ret = PTR_ERR(dev->pinctrl); + goto err_pinctrl; + } + + dev->pins_default = pinctrl_lookup_state(dev->pinctrl, + PINCTRL_STATE_DEFAULT); + if (IS_ERR(dev->pins_default)) + dev_err(&adev->dev, "could not get default pinstate\n"); + else { + ret = pinctrl_select_state(dev->pinctrl, + dev->pins_default); + if (ret) + dev_dbg(&adev->dev, "could not set default pinstate\n"); + } + + dev->pins_idle = pinctrl_lookup_state(dev->pinctrl, + PINCTRL_STATE_IDLE); + if (IS_ERR(dev->pins_idle)) + dev_dbg(&adev->dev, "could not get idle pinstate\n"); + else { + /* If possible, let's go to idle until the first transfer */ + ret = pinctrl_select_state(dev->pinctrl, + dev->pins_idle); + if (ret) + dev_dbg(&adev->dev, "could not set idle pinstate\n"); + } + + dev->pins_sleep = pinctrl_lookup_state(dev->pinctrl, + PINCTRL_STATE_SLEEP); + if (IS_ERR(dev->pins_sleep)) + dev_dbg(&adev->dev, "could not get sleep pinstate\n"); + dev->virtbase = ioremap(adev->res.start, resource_size(&adev->res)); if (!dev->virtbase) { ret = -ENOMEM; @@ -1022,6 +1113,7 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) err_no_ioremap: amba_set_drvdata(adev, NULL); kfree(dev); + err_pinctrl: err_no_mem: return ret;