On 2018-08-03 21:08, Andy Shevchenko wrote:
- APU2/APU3 -> front button reset support
- APU3 -> SIM switch support
Good.
Can we see some specification for those platforms?
I think the informations from Christian Lamparter are OK?
<https://www.pcengines.ch/pdf/apu1.pdf>
<https://www.pcengines.ch/schema/apu1c.pdf>
<https://www.pcengines.ch/pdf/apu2.pdf>
<http://pcengines.ch/schema/apu2c.pdf>
+ * GNU General Public License for more details
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see
<http://www.gnu.org/licenses/>
SPDX, please!
I have already updated my patch in my git to use this identifier.
// SPDX-License-Identifier: GPL-2.0
This was a hint from Linus Walleji
+ */
+#include <linux/gpio.h>
+#include <linux/gpio_keys.h>
These both looks very strange in here.
On the front of the APU2/APU3 there is a SMD-push-button which is
connected to
one of the GPIOs. This is used as a reset button for the system
(reboot/factory-reset).
I am also not sure if this is the right place. But for the first review
i thought this
will be ok.
The geode, the old board from PC-Engines
added the key gpios to this file
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/platform/geode/alix.c#n47
mybe this is the right place too x86/platfrom/apu/apu.c?
+#define APU_FCH_ACPI_MMIO_BASE 0xFED80000
+#define APU_FCH_GPIO_BASE (APU_FCH_ACPI_MMIO_BASE + 0x1500)
Wow! Can we see ACPI tables for these boards? Care to share (via some
file share service) output of `acpidump -o tables.dat` ?
I have copied this from the leds-apu.c driver which is already upstream.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/leds/leds-apu.c#n43
+#define APU_GPIO_BIT_WRITE 22
+#define APU_GPIO_BIT_READ 16
+#define APU_GPIO_BIT_DIR 23
WR and RD looks shorter,
And please keep them sorted by value.
Ok will fix this.
+#define APU_IOSIZE sizeof(u32)
This is usual for x86 stuff, no need to have a definition, I think.
Ok will fix this.
+static unsigned long apu3_gpio_offset[APU3_NUM_GPIO] = {
+ APU_FCH_GPIO_BASE + 89 * APU_IOSIZE, //KEY
+ APU_FCH_GPIO_BASE + 90 * APU_IOSIZE, //SIM
+};
+static void __iomem *apu3_gpio_addr[APU3_NUM_GPIO] = {NULL, NULL};
+
+static int gpio_apu_get_dir (struct gpio_chip *chip, unsigned offset)
Style! We do not use space between func and its parameter list.
OK
+{
+ u32 val;
+
+ spin_lock(&apu_gpio->lock);
+
+ val = ~ioread32(apu_gpio->addr[offset]);
This is unusual (I mean ~). Better to leave IO alone and do bits
manipulations latter on.
OK
+ val = (val >> APU_GPIO_BIT_DIR) & 1;
Do you need this under spin lock?
No i don´t.
Will fix this.
Thanks
+ apu_gpio->chip->ngpio = ARRAY_SIZE(apu2_gpio_offset);
+ for( i = 0; i < ARRAY_SIZE(apu2_gpio_offset); i++) {
+ apu2_gpio_addr[i] = devm_ioremap(&pdev->dev,
+ apu_gpio->offset[i],
apu_gpio->iosize);
+ if (!apu2_gpio_addr[i]) {
+ return -ENOMEM;
+ }
+ }
+ }
The above should be part either as callback or driver_data of DMI
entries.
I have copied this from the leds-apu.c driver
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/leds/leds-apu.c#n226
+ ret = gpiochip_add(&gpio_apu_chip);
devm_
What do you mean with "devm_"?
+ if (ret) {
+ pr_err("Adding gpiochip failed\n");
dev_err(), but I consider this message completely useless.
Thanks will remove this too.
+ }
+
+ register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu_gpio_keys),
apu_gpio_keys);
+
Not part of this driver. Remove.
As described above should this go to a file "apu.c" in the directory
"apu" under
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/platform
?
+ return ret;
+}
+module_init(apu_gpio_init);
+module_exit(apu_gpio_exit);
Consider to use module_platform_driver() and accompanying data
structures and functions.
Ok thanks will update this
Will update my patch with your hints thanks
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