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Date: Tue, 25 Jul 2017 10:16:40 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Thierry Reding <thierry.reding@...il.com>,
Linus Walleij <linus.walleij@...aro.org>
CC: <linux-gpio@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] gpio: tegra: Use unsigned int where possible
On 24/07/17 15:55, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
>
> In most of the cases, integers in this file can't be negative, so the
> type can be more restricted for clarity.
>
> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
> drivers/gpio/gpio-tegra.c | 57 ++++++++++++++++++++---------------------------
> 1 file changed, 24 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
> index edc1a14557f0..eb8b4d6d29cc 100644
> --- a/drivers/gpio/gpio-tegra.c
> +++ b/drivers/gpio/gpio-tegra.c
> @@ -67,8 +67,8 @@
> struct tegra_gpio_info;
>
> struct tegra_gpio_bank {
> - int bank;
> - int irq;
> + unsigned int bank;
> + unsigned int irq;
> spinlock_t lvl_lock[4];
> spinlock_t dbc_lock[4]; /* Lock for updating debounce count register */
> #ifdef CONFIG_PM_SLEEP
> @@ -112,13 +112,14 @@ static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg)
> return __raw_readl(tgi->regs + reg);
> }
>
> -static int tegra_gpio_compose(int bank, int port, int bit)
> +static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port,
> + unsigned int bit)
> {
> return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
> }
>
> static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
> - int gpio, int value)
> + unsigned int gpio, u32 value)
> {
> u32 val;
>
> @@ -128,12 +129,12 @@ static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
> tegra_gpio_writel(tgi, val, reg);
> }
>
> -static void tegra_gpio_enable(struct tegra_gpio_info *tgi, int gpio)
> +static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio)
> {
> tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1);
> }
>
> -static void tegra_gpio_disable(struct tegra_gpio_info *tgi, int gpio)
> +static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio)
> {
> tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
> }
> @@ -162,7 +163,7 @@ static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset,
> static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset)
> {
> struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
> - int bval = BIT(GPIO_BIT(offset));
> + unsigned int bval = BIT(GPIO_BIT(offset));
>
> /* If gpio is in output mode then read from the out value */
> if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval)
> @@ -216,7 +217,7 @@ static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
> struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)];
> unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000);
> unsigned long flags;
> - int port;
> + unsigned int port;
>
> if (!debounce_ms) {
> tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset),
> @@ -265,7 +266,7 @@ static void tegra_gpio_irq_ack(struct irq_data *d)
> {
> struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
> struct tegra_gpio_info *tgi = bank->tgi;
> - int gpio = d->hwirq;
> + unsigned int gpio = d->hwirq;
>
> tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio));
> }
> @@ -274,7 +275,7 @@ static void tegra_gpio_irq_mask(struct irq_data *d)
> {
> struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
> struct tegra_gpio_info *tgi = bank->tgi;
> - int gpio = d->hwirq;
> + unsigned int gpio = d->hwirq;
>
> tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
> }
> @@ -283,20 +284,18 @@ static void tegra_gpio_irq_unmask(struct irq_data *d)
> {
> struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
> struct tegra_gpio_info *tgi = bank->tgi;
> - int gpio = d->hwirq;
> + unsigned int gpio = d->hwirq;
>
> tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
> }
>
> static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> {
> - int gpio = d->hwirq;
> + unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
> struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
> struct tegra_gpio_info *tgi = bank->tgi;
> - int port = GPIO_PORT(gpio);
> - int lvl_type;
> - int val;
> unsigned long flags;
> + u32 val;
> int ret;
>
> switch (type & IRQ_TYPE_SENSE_MASK) {
> @@ -327,7 +326,7 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
> if (ret) {
> dev_err(tgi->dev,
> - "unable to lock Tegra GPIO %d as IRQ\n", gpio);
> + "unable to lock Tegra GPIO %u as IRQ\n", gpio);
> return ret;
> }
>
> @@ -355,17 +354,14 @@ static void tegra_gpio_irq_shutdown(struct irq_data *d)
> {
> struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
> struct tegra_gpio_info *tgi = bank->tgi;
> - int gpio = d->hwirq;
> + unsigned int gpio = d->hwirq;
>
> gpiochip_unlock_as_irq(&tgi->gc, gpio);
> }
>
> static void tegra_gpio_irq_handler(struct irq_desc *desc)
> {
> - int port;
> - int pin;
> - int unmasked = 0;
> - int gpio;
> + unsigned int unmasked = 0, port, pin, gpio;
> u32 lvl;
> unsigned long sta;
> struct irq_chip *chip = irq_desc_get_chip(desc);
> @@ -408,8 +404,7 @@ static int tegra_gpio_resume(struct device *dev)
> struct platform_device *pdev = to_platform_device(dev);
> struct tegra_gpio_info *tgi = platform_get_drvdata(pdev);
> unsigned long flags;
> - int b;
> - int p;
> + unsigned int b, p;
>
> local_irq_save(flags);
>
> @@ -449,8 +444,7 @@ static int tegra_gpio_suspend(struct device *dev)
> struct platform_device *pdev = to_platform_device(dev);
> struct tegra_gpio_info *tgi = platform_get_drvdata(pdev);
> unsigned long flags;
> - int b;
> - int p;
> + unsigned int b, p;
>
> local_irq_save(flags);
> for (b = 0; b < tgi->bank_count; b++) {
> @@ -489,7 +483,7 @@ static int tegra_gpio_suspend(struct device *dev)
> static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
> {
> struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
> - int gpio = d->hwirq;
> + unsigned int gpio = d->hwirq;
> u32 port, bit, mask;
>
> port = GPIO_PORT(gpio);
> @@ -513,15 +507,14 @@ static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
> static int dbg_gpio_show(struct seq_file *s, void *unused)
> {
> struct tegra_gpio_info *tgi = s->private;
> - int i;
> - int j;
> + unsigned int i, j;
>
> for (i = 0; i < tgi->bank_count; i++) {
> for (j = 0; j < 4; j++) {
> - int gpio = tegra_gpio_compose(i, j, 0);
> + unsigned int gpio = tegra_gpio_compose(i, j, 0);
>
> seq_printf(s,
> - "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
> + "%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
> i, j,
> tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
> tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
> @@ -576,10 +569,8 @@ static int tegra_gpio_probe(struct platform_device *pdev)
> struct tegra_gpio_info *tgi;
> struct resource *res;
> struct tegra_gpio_bank *bank;
> + unsigned int gpio, i, j;
> int ret;
> - int gpio;
> - int i;
> - int j;
>
> tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
> if (!tgi)
Acked-by: Jon Hunter <jonathanh@...dia.com>
Cheers
Jon
--
nvpublic
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