Tegra20's GPIO controller has 7 banks, and Tegra30's controller has 8 banks. Allow the number of banks to be configured at run-time by the device tree.
Signed-off-by: Stephen Warren <[email protected]> --- This patch depends on: http://ftp.arm.linux.org.uk/pub/armlinux/kernel/git-cur/linux-2.6-arm.git devel-stable 44986ab056076e9dc9fb9f8b4729afef7fa72616 --- .../devicetree/bindings/gpio/gpio_nvidia.txt | 4 ++ arch/arm/boot/dts/tegra20.dtsi | 1 + arch/arm/boot/dts/tegra30.dtsi | 1 + drivers/gpio/gpio-tegra.c | 41 +++++++++++++++---- 4 files changed, 38 insertions(+), 9 deletions(-) diff --git a/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt b/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt index d114e19..f9c2cc2 100644 --- a/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt +++ b/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt @@ -3,6 +3,9 @@ NVIDIA Tegra 2 GPIO controller Required properties: - compatible : "nvidia,tegra20-gpio" - reg : Physical base address and length of the controller's registers. +- nvidia,num-banks : The number of GPIO banks. This should be 7 for + Tegra20 and 8 for Tegra30. This must match the number of interrupt + specifiers in the interrupts property. - interrupts : The interrupt outputs from the controller. - #gpio-cells : Should be two. The first cell is the pin number and the second cell is used to specify optional parameters: @@ -24,6 +27,7 @@ Example: gpio: gpio@6000d000 { compatible = "nvidia,tegra20-gpio"; reg = < 0x6000d000 0x1000 >; + nvidia,num-banks = <7>; interrupts = < 0 32 0x04 0 33 0x04 0 34 0x04 diff --git a/arch/arm/boot/dts/tegra20.dtsi b/arch/arm/boot/dts/tegra20.dtsi index 0cdc4a6..853a5c6 100644 --- a/arch/arm/boot/dts/tegra20.dtsi +++ b/arch/arm/boot/dts/tegra20.dtsi @@ -66,6 +66,7 @@ gpio: gpio@6000d000 { compatible = "nvidia,tegra20-gpio"; reg = < 0x6000d000 0x1000 >; + nvidia,num-banks = <7>; interrupts = < 0 32 0x04 0 33 0x04 0 34 0x04 diff --git a/arch/arm/boot/dts/tegra30.dtsi b/arch/arm/boot/dts/tegra30.dtsi index 83024c0..368cbb3 100644 --- a/arch/arm/boot/dts/tegra30.dtsi +++ b/arch/arm/boot/dts/tegra30.dtsi @@ -55,6 +55,7 @@ gpio: gpio@6000d000 { compatible = "nvidia,tegra30-gpio", "nvidia,tegra20-gpio"; reg = < 0x6000d000 0x1000 >; + nvidia,num-banks = <8>; interrupts = < 0 32 0x04 0 33 0x04 0 34 0x04 diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c index c877a33..d27ca13 100644 --- a/drivers/gpio/gpio-tegra.c +++ b/drivers/gpio/gpio-tegra.c @@ -77,7 +77,8 @@ struct tegra_gpio_bank { static struct irq_domain irq_domain; static void __iomem *regs; -static struct tegra_gpio_bank tegra_gpio_banks[7]; +static u32 tegra_gpio_bank_count; +static struct tegra_gpio_bank *tegra_gpio_banks; static inline void tegra_gpio_writel(u32 val, u32 reg) { @@ -274,7 +275,7 @@ void tegra_gpio_resume(void) local_irq_save(flags); - for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) { + for (b = 0; b < tegra_gpio_bank_count; b++) { struct tegra_gpio_bank *bank = &tegra_gpio_banks[b]; for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { @@ -297,7 +298,7 @@ void tegra_gpio_suspend(void) int p; local_irq_save(flags); - for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) { + for (b = 0; b < tegra_gpio_bank_count; b++) { struct tegra_gpio_bank *bank = &tegra_gpio_banks[b]; for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { @@ -338,23 +339,45 @@ static struct lock_class_key gpio_lock_class; static int __devinit tegra_gpio_probe(struct platform_device *pdev) { + int irq_base; struct resource *res; struct tegra_gpio_bank *bank; int gpio; int i; int j; - irq_domain.irq_base = irq_alloc_descs(-1, 0, TEGRA_NR_GPIOS, 0); - if (irq_domain.irq_base < 0) { + if (pdev->dev.of_node) { + if (of_property_read_u32(pdev->dev.of_node, "nvidia,num-banks", + &tegra_gpio_bank_count) < 0) { + dev_err(&pdev->dev, + "Missing property 'nvidia,num-banks'\n"); + return -ENODEV; + } + } + if (!tegra_gpio_bank_count) + tegra_gpio_bank_count = 7; + tegra_gpio_chip.ngpio = tegra_gpio_bank_count * 32; + + tegra_gpio_banks = devm_kzalloc(&pdev->dev, + tegra_gpio_bank_count * sizeof(*tegra_gpio_banks), + GFP_KERNEL); + if (!tegra_gpio_banks) { + dev_err(&pdev->dev, "Couldn't allocate bank structure\n"); + return -ENODEV; + } + + irq_base = irq_alloc_descs(-1, 0, tegra_gpio_chip.ngpio, 0); + if (irq_base < 0) { dev_err(&pdev->dev, "Couldn't allocate IRQ numbers\n"); return -ENODEV; } - irq_domain.nr_irq = TEGRA_NR_GPIOS; + irq_domain.irq_base = irq_base; + irq_domain.nr_irq = tegra_gpio_chip.ngpio; irq_domain.ops = &irq_domain_simple_ops; irq_domain.of_node = pdev->dev.of_node; irq_domain_add(&irq_domain); - for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) { + for (i = 0; i < tegra_gpio_bank_count; i++) { res = platform_get_resource(pdev, IORESOURCE_IRQ, i); if (!res) { dev_err(&pdev->dev, "Missing IRQ resource\n"); @@ -398,7 +421,7 @@ static int __devinit tegra_gpio_probe(struct platform_device *pdev) gpiochip_add(&tegra_gpio_chip); - for (gpio = 0; gpio < TEGRA_NR_GPIOS; gpio++) { + for (gpio = 0; gpio < tegra_gpio_chip.ngpio; gpio++) { int irq = irq_domain_to_irq(&irq_domain, gpio); /* No validity check; all Tegra GPIOs are valid IRQs */ @@ -411,7 +434,7 @@ static int __devinit tegra_gpio_probe(struct platform_device *pdev) set_irq_flags(irq, IRQF_VALID); } - for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) { + for (i = 0; i < tegra_gpio_bank_count; i++) { bank = &tegra_gpio_banks[i]; irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
