Hi Peng Fan,
On 01/19/15 08:11, Peng Fan wrote:
This patch supports getting gpios' configuration from dtb. CONFIG_OF_CONTROL is used to indicated which part is for device tree, and which is not.
Can we please avoid the DT #ifdeffery in the drivers? and just implement the needed API stubs?
This patch is already tested on mx6sxsabresd board. Since device tree has not been upstreamed, if want to test this patch. The followings need to be done.
- pieces of code does not gpio_request when using gpio_direction_xxx and etc, need to request gpio.
- move the gpio settings from board_early_init_f to board_init
- define CONFIG_DM ,CONFIG_DM_GPIO and CONFIG_OF_CONTROL
- Add device tree file and do related configuration in `make ARCH=arm menuconfig`
Signed-off-by: Peng Fan Peng.Fan@freescale.com
drivers/gpio/mxc_gpio.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+)
diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c index 8bb9e39..8603068 100644 --- a/drivers/gpio/mxc_gpio.c +++ b/drivers/gpio/mxc_gpio.c @@ -14,6 +14,10 @@ #include <asm/arch/imx-regs.h> #include <asm/gpio.h> #include <asm/io.h> +#ifdef CONFIG_OF_CONTROL +#include <fdtdec.h> +DECLARE_GLOBAL_DATA_PTR; +#endif
Is there a problem to include fdtdec.h with no CONFIG_OF_CONTROL?
enum mxc_gpio_direction { MXC_GPIO_DIRECTION_IN, @@ -258,6 +262,7 @@ static const struct dm_gpio_ops gpio_mxc_ops = { .get_function = mxc_gpio_get_function, };
+#ifndef CONFIG_OF_CONTROL static const struct mxc_gpio_plat mxc_plat[] = { { (struct gpio_regs *)GPIO1_BASE_ADDR }, { (struct gpio_regs *)GPIO2_BASE_ADDR }, @@ -274,6 +279,7 @@ static const struct mxc_gpio_plat mxc_plat[] = { { (struct gpio_regs *)GPIO7_BASE_ADDR }, #endif }; +#endif
I think instead of compiling this out, you should reuse it.
static int mxc_gpio_probe(struct udevice *dev) { @@ -283,7 +289,19 @@ static int mxc_gpio_probe(struct udevice *dev) int banknum; char name[18], *str;
+#ifdef CONFIG_OF_CONTROL
- /*
* In dts file add:* aliases {* gpio0 = &gpio1;* gpio1 = &gpio2;* .....* };* Then set banknum accoring dev's seq number. */- banknum = dev->seq;
+#else banknum = plat - mxc_plat; +#endif
Well, I never liked too much that plat - mxc-plat logic, but still I think, you should be able to have one implementation for both cases? There is a good example in doc/driver-model/spi-howto.txt.
sprintf(name, "GPIO%d_", banknum + 1); str = strdup(name); if (!str) @@ -295,14 +313,71 @@ static int mxc_gpio_probe(struct udevice *dev) return 0; }
+#ifdef CONFIG_OF_CONTROL +static int mxc_gpio_bind(struct udevice *device) +{
- struct mxc_gpio_plat *plat = device->platdata;
- struct gpio_regs *ctrl;
- if (plat)
return 0;- /*
* In the dts file, gpiox bank are as following:* gpio1: gpio@0209c000 {* compatible = "fsl,imx6q-gpio", "fsl,imx35-gpio";* reg = <0x0209c000 0x4000>;* interrupts = <0 66 0x04 0 67 0x04>;* gpio-controller;* #gpio-cells = <2>;* interrupt-controller;* #interrupt-cells = <2>;* };** gpio2: gpio@020a0000 {* compatible = "fsl,imx6q-gpio", "fsl,imx35-gpio";* reg = <0x020a0000 0x4000>;* interrupts = <0 68 0x04 0 69 0x04>;* gpio-controller;* #gpio-cells = <2>;* interrupt-controller;* #interrupt-cells = <2>;* };** gpio1 is the 1st bank, gpio2 is the 2nd bank and gpio3 ....*/
The above comment looks not belonging here... but in documentation/dts itself?
- ctrl = (struct gpio_regs *)fdtdec_get_addr(gd->fdt_blob,
device->of_offset, "reg");
How about implementing a stub for this returning NULL?
- plat = calloc(1, sizeof(*plat));
- if (!plat)
return -ENOMEM;- plat->regs = ctrl;
- device->platdata = plat;
- return 0;
+}
+static const struct udevice_id mxc_gpio_ids[] = {
- { .compatible = "fsl,imx35-gpio" },
- { }
+}; +#endif
U_BOOT_DRIVER(gpio_mxc) = { .name = "gpio_mxc", .id = UCLASS_GPIO, .ops = &gpio_mxc_ops, .probe = mxc_gpio_probe, .priv_auto_alloc_size = sizeof(struct mxc_bank_info), +#ifdef CONFIG_OF_CONTROL
- .of_match = mxc_gpio_ids,
- .bind = mxc_gpio_bind,
+#endif };
+#ifndef CONFIG_OF_CONTROL U_BOOT_DEVICES(mxc_gpios) = { { "gpio_mxc", &mxc_plat[0] }, { "gpio_mxc", &mxc_plat[1] }, @@ -320,3 +395,4 @@ U_BOOT_DEVICES(mxc_gpios) = { #endif }; #endif +#endif