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Date: Sat, 19 May 2012 12:12:42 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Shawn Guo <shawn.guo@...aro.org>,
Linus Walleij <linus.walleij@...ricsson.com>
Cc: "Hans J. Koch" <hjk@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Ryan Mallon <rmallon@...il.com>,
Hartley Sweeten <hsweeten@...ionengravers.com>,
LW@...O-electronics.de, Sascha Hauer <s.hauer@...gutronix.de>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH v2] gpio/generic: initialize basic_mmio_gpio shadow variables properly
On Sat, 19 May 2012 16:55:51 +0800, Shawn Guo <shawn.guo@...aro.org> wrote:
> It fixes the issue in gpio-generic that commit fb14921 (gpio/mxc: add
> missing initialization of basic_mmio_gpio shadow variables) manged to
> fix in gpio-mxc driver, so that other platform specific drivers do not
> suffer from the same problem over and over again.
>
> Changes since v1:
> * Turn the last parameter "bool big_endian" into "unsigned long flags"
> and give those really quirky hardwares a chance to tell that reg_set
> and reg_dir are unreadable.
>
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
Applied, thanks.
g.
> ---
> drivers/gpio/gpio-ep93xx.c | 2 +-
> drivers/gpio/gpio-generic.c | 9 +++++++--
> drivers/gpio/gpio-mxc.c | 2 +-
> drivers/gpio/gpio-mxs.c | 2 +-
> drivers/gpio/gpio-sodaville.c | 2 +-
> include/linux/basic_mmio_gpio.h | 6 +++++-
> 6 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
> index 776b772..9fe5b8fe 100644
> --- a/drivers/gpio/gpio-ep93xx.c
> +++ b/drivers/gpio/gpio-ep93xx.c
> @@ -325,7 +325,7 @@ static int ep93xx_gpio_add_bank(struct bgpio_chip *bgc, struct device *dev,
> void __iomem *dir = mmio_base + bank->dir;
> int err;
>
> - err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, false);
> + err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, 0);
> if (err)
> return err;
>
> diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
> index e38dd0c..51912f7 100644
> --- a/drivers/gpio/gpio-generic.c
> +++ b/drivers/gpio/gpio-generic.c
> @@ -364,7 +364,7 @@ EXPORT_SYMBOL_GPL(bgpio_remove);
> int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
> unsigned long sz, void __iomem *dat, void __iomem *set,
> void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
> - bool big_endian)
> + unsigned long flags)
> {
> int ret;
>
> @@ -385,7 +385,7 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
> if (ret)
> return ret;
>
> - ret = bgpio_setup_accessors(dev, bgc, big_endian);
> + ret = bgpio_setup_accessors(dev, bgc, flags & BGPIOF_BIG_ENDIAN);
> if (ret)
> return ret;
>
> @@ -394,6 +394,11 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
> return ret;
>
> bgc->data = bgc->read_reg(bgc->reg_dat);
> + if (bgc->gc.set == bgpio_set_set &&
> + !(flags & BGPIOF_UNREADABLE_REG_SET))
> + bgc->data = bgc->read_reg(bgc->reg_set);
> + if (bgc->reg_dir && !(flags & BGPIOF_UNREADABLE_REG_DIR))
> + bgc->dir = bgc->read_reg(bgc->reg_dir);
>
> return ret;
> }
> diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
> index e791476..c337143 100644
> --- a/drivers/gpio/gpio-mxc.c
> +++ b/drivers/gpio/gpio-mxc.c
> @@ -417,7 +417,7 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
> err = bgpio_init(&port->bgc, &pdev->dev, 4,
> port->base + GPIO_PSR,
> port->base + GPIO_DR, NULL,
> - port->base + GPIO_GDIR, NULL, false);
> + port->base + GPIO_GDIR, NULL, 0);
> if (err)
> goto out_iounmap;
>
> diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
> index 429228b..39e4956 100644
> --- a/drivers/gpio/gpio-mxs.c
> +++ b/drivers/gpio/gpio-mxs.c
> @@ -285,7 +285,7 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
> err = bgpio_init(&port->bgc, &pdev->dev, 4,
> port->base + PINCTRL_DIN(port),
> port->base + PINCTRL_DOUT(port), NULL,
> - port->base + PINCTRL_DOE(port), NULL, false);
> + port->base + PINCTRL_DOE(port), NULL, 0);
> if (err)
> return err;
>
> diff --git a/drivers/gpio/gpio-sodaville.c b/drivers/gpio/gpio-sodaville.c
> index 031e5d2..38da23d 100644
> --- a/drivers/gpio/gpio-sodaville.c
> +++ b/drivers/gpio/gpio-sodaville.c
> @@ -224,7 +224,7 @@ static int __devinit sdv_gpio_probe(struct pci_dev *pdev,
>
> ret = bgpio_init(&sd->bgpio, &pdev->dev, 4,
> sd->gpio_pub_base + GPINR, sd->gpio_pub_base + GPOUTR,
> - NULL, sd->gpio_pub_base + GPOER, NULL, false);
> + NULL, sd->gpio_pub_base + GPOER, NULL, 0);
> if (ret)
> goto unmap;
> sd->bgpio.gc.ngpio = SDV_NUM_PUB_GPIOS;
> diff --git a/include/linux/basic_mmio_gpio.h b/include/linux/basic_mmio_gpio.h
> index feb91219..1c504ca 100644
> --- a/include/linux/basic_mmio_gpio.h
> +++ b/include/linux/basic_mmio_gpio.h
> @@ -67,6 +67,10 @@ int bgpio_remove(struct bgpio_chip *bgc);
> int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
> unsigned long sz, void __iomem *dat, void __iomem *set,
> void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
> - bool big_endian);
> + unsigned long flags);
> +
> +#define BGPIOF_BIG_ENDIAN BIT(0)
> +#define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */
> +#define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */
>
> #endif /* __BASIC_MMIO_GPIO_H */
> --
> 1.7.5.4
>
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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