Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753482AbbFYK0b (ORCPT ); Thu, 25 Jun 2015 06:26:31 -0400 Received: from mail-wi0-f174.google.com ([209.85.212.174]:37081 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752610AbbFYK0Y (ORCPT ); Thu, 25 Jun 2015 06:26:24 -0400 Date: Thu, 25 Jun 2015 11:26:18 +0100 From: Lee Jones To: Vaibhav Hiremath Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, yizhang@marvell.com, Zhao Ye Subject: Re: [PATCH-v4 2/3] mfd: 88pm800: Set default interrupt clear method Message-ID: <20150625102618.GC15013@x1> References: <1435217189-19578-1-git-send-email-vaibhav.hiremath@linaro.org> <1435217189-19578-3-git-send-email-vaibhav.hiremath@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1435217189-19578-3-git-send-email-vaibhav.hiremath@linaro.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4542 Lines: 140 On Thu, 25 Jun 2015, Vaibhav Hiremath wrote: > As per the spec, bit 1 (INT_CLEAR_MODE) of reg addr 0xe > (page 0) controls the method of clearing interrupt > status of 88pm800 family of devices; > > 0: clear on read > 1: clear on write > > If pdata is not coming from board file, then set the > default irq clear method to "irq clear on write" > > Also, as suggested by "Lee Jones" renaming variable field > to appropriate name. > > Signed-off-by: Zhao Ye > Signed-off-by: Vaibhav Hiremath > --- > drivers/mfd/88pm800.c | 15 ++++++++++----- > include/linux/mfd/88pm80x.h | 6 ++++-- > 2 files changed, 14 insertions(+), 7 deletions(-) > > diff --git a/drivers/mfd/88pm800.c b/drivers/mfd/88pm800.c > index 40fd014..e0cd7ad 100644 > --- a/drivers/mfd/88pm800.c > +++ b/drivers/mfd/88pm800.c > @@ -376,7 +376,7 @@ static int device_irq_init_800(struct pm80x_chip *chip) > { > struct regmap *map = chip->regmap; > unsigned long flags = IRQF_ONESHOT; > - int data, mask, ret = -EINVAL; > + int irq_clr_mode, mask, ret = -EINVAL; > > if (!map || !chip->irq) { > dev_err(chip->dev, "incorrect parameters\n"); > @@ -384,15 +384,16 @@ static int device_irq_init_800(struct pm80x_chip *chip) > } > > /* > - * irq_mode defines the way of clearing interrupt. it's read-clear by > - * default. > + * irq_clr_on_wr defines the way of clearing interrupt by > + * read/write(0/1). It's read-clear by default. > */ > mask = > PM800_WAKEUP2_INV_INT | PM800_WAKEUP2_INT_CLEAR | > PM800_WAKEUP2_INT_MASK; > > - data = PM800_WAKEUP2_INT_CLEAR; > - ret = regmap_update_bits(map, PM800_WAKEUP2, mask, data); > + irq_clr_mode = (chip->irq_clr_on_wr) ? Drop the brackets. > + PM800_WAKEUP2_INT_WRITE_CLEAR : PM800_WAKEUP2_INT_READ_CLEAR; > + ret = regmap_update_bits(map, PM800_WAKEUP2, mask, irq_clr_mode); > > if (ret < 0) > goto out; > @@ -514,6 +515,7 @@ static int device_800_init(struct pm80x_chip *chip, > } > > chip->regmap_irq_chip = &pm800_irq_chip; > + chip->irq_clr_on_wr = pdata->irq_clr_on_wr; You have protection around pdata everywhere else in the file, I suggest you supply some here too. > ret = device_irq_init_800(chip); > if (ret < 0) { > @@ -566,6 +568,9 @@ static int pm800_probe(struct i2c_client *client, > pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); > if (!pdata) > return -ENOMEM; > + > + /* by default, set irq clear method on write */ > + pdata->irq_clr_on_wr = true; You can save yourself some memory here, by removing this seemingly pointless allocation and do this above: chip->irq_clr_on_wr = pdata ? pdata->irq_clr_on_wr : true; > } > > ret = pm80x_init(client); > diff --git a/include/linux/mfd/88pm80x.h b/include/linux/mfd/88pm80x.h > index 97cb283..94b3dcd 100644 > --- a/include/linux/mfd/88pm80x.h > +++ b/include/linux/mfd/88pm80x.h > @@ -77,6 +77,8 @@ enum { > #define PM800_WAKEUP2 (0x0E) > #define PM800_WAKEUP2_INV_INT (1 << 0) > #define PM800_WAKEUP2_INT_CLEAR (1 << 1) > +#define PM800_WAKEUP2_INT_READ_CLEAR (0 << 1) > +#define PM800_WAKEUP2_INT_WRITE_CLEAR (1 << 1) > #define PM800_WAKEUP2_INT_MASK (1 << 2) Use the BIT() macro. > #define PM800_POWER_UP_LOG (0x10) > @@ -300,7 +302,7 @@ struct pm80x_chip { > struct regmap_irq_chip_data *irq_data; > int type; > int irq; > - int irq_mode; > + int irq_clr_on_wr; /* '1': Clear on write, '0': Clear on read*/ Whitespace issue. Shouldn't this be a bool? Actually even better, I would define; CLR_ON_WRITE and CLR_ON_READ, and call the variable irq_clear_method, or something. Much clearer that way I think. > unsigned long wu_flag; > spinlock_t lock; > }; > @@ -315,7 +317,7 @@ struct pm80x_platform_data { > */ > struct regulator_init_data *regulators[PM800_ID_RG_MAX]; > unsigned int num_regulators; > - int irq_mode; /* Clear interrupt by read/write(0/1) */ > + int irq_clr_on_wr; /* Clear interrupt by read/write(0/1) */ > int batt_det; /* enable/disable */ > int (*plat_config)(struct pm80x_chip *chip, > struct pm80x_platform_data *pdata); -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- 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/