Hi Michal,
Am 23.07.2018 um 13:43 schrieb Michal Simek:
On 20.7.2018 22:05, Stefan Herbrechtsmeier wrote:
Am 13.07.2018 um 17:20 schrieb Michal Simek:
This patch is enabling GPIO_DM support to have an option to use this
driver together with zynq gpio driver.
!DM part is kept there till Microblaze is cleanup which will be done
hopefully soon.
Just a note:
There is no reason to initialize uc-priv->name because it is completely
unused.
Signed-off-by: Michal Simek <michal.si...@xilinx.com>
---
Changes in v2:
- Show value in set_value when debug is enabled
- Implement xlate function
- Remove tabs from structures for alignment (to be consistent with the
rest of code)
drivers/gpio/xilinx_gpio.c | 265
++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 264 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/xilinx_gpio.c b/drivers/gpio/xilinx_gpio.c
index 74c5be0865d1..48b52c985a55 100644
--- a/drivers/gpio/xilinx_gpio.c
+++ b/drivers/gpio/xilinx_gpio.c
[snip]
+static int xilinx_gpio_probe(struct udevice *dev)
+{
+ struct xilinx_gpio_platdata *platdata = dev_get_platdata(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ uc_priv->bank_name = dev->name;
Have you check the "gpio status -a" output? Maybe you could use a
gpio-bank-name from the device tree.
The same as for zynq. gpio-bank-name is not in Linux. And yes I was
checking output. If you know better way please let me know.
Please see my other answer.
+
+ uc_priv->gpio_count = platdata->bank_max[0] + platdata->bank_max[1];
+
+ return 0;
+}
+
+static int xilinx_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct xilinx_gpio_platdata *platdata = dev_get_platdata(dev);
+ int is_dual;
+
+ platdata->regs = (struct gpio_regs *)dev_read_addr(dev);
+
+ platdata->bank_max[0] = dev_read_u32_default(dev,
+ "xlnx,gpio-width", 0);
The default value of the Linux driver is 32.
but not in binding doc.
Okay
+ platdata->bank_input[0] = dev_read_u32_default(dev,
+ "xlnx,all-inputs", 0);
This isn't supported by the Linux driver but documented in the device
tree bindings.
correct.
+ platdata->bank_output[0] = dev_read_u32_default(dev,
+ "xlnx,all-outputs", 0);
This isn't supported by the Linux driver neither documented in the
device tree bindings.
This IP, driver and dt binding was done pretty long time ago. I could be
one of the first dt driver that's why there could issues with dt bindings.
DTG is generating all these properties from day one and in Linux only
documented property where that one which are used by Linux.
All that old dt binding docs should be checked again and there is
actually 22 patches sent to gpio mailing list
https://patchwork.ozlabs.org/patch/947371/
but I haven't looked at them yet.
Okay
+
+ is_dual = dev_read_u32_default(dev, "xlnx,is-dual", 0);
+ if (is_dual) {
+ platdata->bank_max[1] = dev_read_u32_default(dev,
+ "xlnx,gpio2-width", 0);
+ platdata->bank_input[1] = dev_read_u32_default(dev,
+ "xlnx,all-inputs-2", 0);
+ platdata->bank_output[1] = dev_read_u32_default(dev,
+ "xlnx,all-outputs-2", 0);
+ }
+
+ return 0;
+}
+
+static const struct udevice_id xilinx_gpio_ids[] = {
+ { .compatible = "xlnx,xps-gpio-1.00.a",},
+ { }
+};
+
+U_BOOT_DRIVER(xilinx_gpio) = {
+ .name = "xlnx_gpio",
+ .id = UCLASS_GPIO,
+ .ops = &xilinx_gpio_ops,
+ .of_match = xilinx_gpio_ids,
+ .ofdata_to_platdata = xilinx_gpio_ofdata_to_platdata,
+ .probe = xilinx_gpio_probe,
+ .platdata_auto_alloc_size = sizeof(struct xilinx_gpio_platdata),
+};
+#endif
Maybe the Xilinx AXI GPIO LogiCore IP driver could be integrated into
the generic gpio-mmio driver. This driver is compatible to the hardware
and doesn't need a default value for the data register in the device tree.
There is no support for irq that's why I don't think this is going to fly.
I wasn't aware of the irq because the irq support is missing in the
xilinx driver at the moment. I only realized that the xilinx driver use
a subset of the generic gpio driver with a different binding.
Best regards
Stefan
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