Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751573AbbD3J6V (ORCPT ); Thu, 30 Apr 2015 05:58:21 -0400 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:55532 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750794AbbD3J4L (ORCPT ); Thu, 30 Apr 2015 05:56:11 -0400 From: Charles Keepax To: lee.jones@linaro.org Cc: sameo@linux.intel.com, broonie@kernel.org, lgirdwood@gmail.com, patches@opensource.wolfsonmicro.com, linux-kernel@vger.kernel.org Subject: [PATCH v3 05/10] mfd: arizona: Factor out SYSCLK enable from wm5102 hardware patch Date: Thu, 30 Apr 2015 10:48:02 +0100 Message-Id: <1430387287-27777-6-git-send-email-ckeepax@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1430387287-27777-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> References: <1430387287-27777-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3900 Lines: 137 wm5102 applies a custom hardware boot sequence, for this the SYSCLK needs to be enabled. This patch factors out the code that enables SYSCLK for this sequence such that it can be used for other boot time operations that require SYSCLK. Signed-off-by: Charles Keepax Acked-by: Lee Jones --- drivers/mfd/arizona-core.c | 77 ++++++++++++++++++++++++++++++++----------- 1 files changed, 57 insertions(+), 20 deletions(-) diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c index 326a4af..b5a7e0e 100644 --- a/drivers/mfd/arizona-core.c +++ b/drivers/mfd/arizona-core.c @@ -264,19 +264,25 @@ static void arizona_disable_reset(struct arizona *arizona) } } -static int wm5102_apply_hardware_patch(struct arizona *arizona) +struct arizona_sysclk_state { + unsigned int fll; + unsigned int sysclk; +}; + +static int arizona_enable_freerun_sysclk(struct arizona *arizona, + struct arizona_sysclk_state *state) { - unsigned int fll, sysclk; int ret, err; /* Cache existing FLL and SYSCLK settings */ - ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &fll); + ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &state->fll); if (ret) { dev_err(arizona->dev, "Failed to cache FLL settings: %d\n", ret); return ret; } - ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, &sysclk); + ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, + &state->sysclk); if (ret) { dev_err(arizona->dev, "Failed to cache SYSCLK settings: %d\n", ret); @@ -306,14 +312,58 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona) goto err_fll; } + return 0; + +err_fll: + err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll); + if (err) + dev_err(arizona->dev, + "Failed to re-apply old FLL settings: %d\n", err); + + return ret; +} + +static int arizona_disable_freerun_sysclk(struct arizona *arizona, + struct arizona_sysclk_state *state) +{ + int ret; + + ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, + state->sysclk); + if (ret) { + dev_err(arizona->dev, + "Failed to re-apply old SYSCLK settings: %d\n", ret); + return ret; + } + + ret = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll); + if (ret) { + dev_err(arizona->dev, + "Failed to re-apply old FLL settings: %d\n", ret); + return ret; + } + + return 0; +} + +static int wm5102_apply_hardware_patch(struct arizona *arizona) +{ + struct arizona_sysclk_state state; + int err, ret; + + ret = arizona_enable_freerun_sysclk(arizona, &state); + if (ret) + return ret; + /* Start the write sequencer and wait for it to finish */ ret = regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0, ARIZONA_WSEQ_ENA | ARIZONA_WSEQ_START | 160); if (ret) { dev_err(arizona->dev, "Failed to start write sequencer: %d\n", ret); - goto err_sysclk; + goto err; } + ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1, ARIZONA_WSEQ_BUSY, 0); if (ret) { @@ -322,21 +372,8 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona) ret = -ETIMEDOUT; } -err_sysclk: - err = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, sysclk); - if (err) { - dev_err(arizona->dev, - "Failed to re-apply old SYSCLK settings: %d\n", - err); - } - -err_fll: - err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, fll); - if (err) { - dev_err(arizona->dev, - "Failed to re-apply old FLL settings: %d\n", - err); - } +err: + err = arizona_disable_freerun_sysclk(arizona, &state); return ret ?: err; } -- 1.7.2.5 -- 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/