Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752477AbaJTDt7 (ORCPT ); Sun, 19 Oct 2014 23:49:59 -0400 Received: from eusmtp01.atmel.com ([212.144.249.243]:59866 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752079AbaJTDt5 (ORCPT ); Sun, 19 Oct 2014 23:49:57 -0400 From: Wenyou Yang To: , CC: , , , , Subject: [PATCH 3/3] i2c/at91: adopt pinctrl support Date: Mon, 20 Oct 2014 11:42:14 +0800 Message-ID: <1413776535-10123-4-git-send-email-wenyou.yang@atmel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1413776535-10123-1-git-send-email-wenyou.yang@atmel.com> References: <1413776535-10123-1-git-send-email-wenyou.yang@atmel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Amend the i2c at91 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 transfer - "sleep" on suspend() This should make it possible to optimize energy usage for the pins both for the suspend/resume cycle Signed-off-by: Wenyou Yang --- drivers/i2c/busses/i2c-at91.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 8f408f8..ed2c382 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -32,6 +32,7 @@ #include #include #include +#include #define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */ #define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */ @@ -748,6 +749,8 @@ static int at91_twi_probe(struct platform_device *pdev) u32 phy_addr; u32 bus_clk_rate; + pinctrl_pm_select_default_state(&pdev->dev); + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); if (!dev) return -ENOMEM; @@ -850,8 +853,10 @@ static int at91_twi_suspend(struct device *dev) { struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); - if (!pm_runtime_suspended(dev)) + if (!pm_runtime_suspended(dev)) { clk_disable_unprepare(twi_dev->clk); + pinctrl_pm_select_sleep_state(dev); + } return 0; } @@ -862,6 +867,7 @@ static int at91_twi_resume(struct device *dev) int ret; if (!pm_runtime_suspended(dev)) { + pinctrl_pm_select_default_state(dev); ret = clk_prepare_enable(twi_dev->clk); if (ret) return ret; @@ -881,6 +887,8 @@ static int at91_twi_runtime_suspend(struct device *dev) clk_disable_unprepare(twi_dev->clk); + pinctrl_pm_select_sleep_state(dev); + return 0; } @@ -888,6 +896,8 @@ static int at91_twi_runtime_resume(struct device *dev) { struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); + pinctrl_pm_select_default_state(dev); + return clk_prepare_enable(twi_dev->clk); } #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/