Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
gpio: kempld: Add support for PLD version >= 2.8
Starting with version 2.8 there is a dedicated register to configure
the output level. Read the PLD version in the probe and select the
correct register to use for the set operations.
Signed-off-by: Alban Bedel <alban.bedel@lht.dlh.de>
Link: https://patch.msgid.link/20260311143120.2179347-3-alban.bedel@lht.dlh.de
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
authored by
Alban Bedel
and committed by
Bartosz Golaszewski
84cb463d
4071437c
+12
-2
+12
-2
drivers/gpio/gpio-kempld.c
+12
-2
drivers/gpio/gpio-kempld.c
···
25
25
struct kempld_gpio_data {
26
26
struct gpio_chip chip;
27
27
struct kempld_device_data *pld;
28
+
u8 out_lvl_reg;
28
29
};
29
30
30
31
/*
···
72
71
struct kempld_device_data *pld = gpio->pld;
73
72
74
73
kempld_get_mutex(pld);
75
-
kempld_gpio_bitop(pld, KEMPLD_GPIO_LVL, offset, value);
74
+
kempld_gpio_bitop(pld, gpio->out_lvl_reg, offset, value);
76
75
kempld_release_mutex(pld);
77
76
78
77
return 0;
···
97
96
struct kempld_device_data *pld = gpio->pld;
98
97
99
98
kempld_get_mutex(pld);
100
-
kempld_gpio_bitop(pld, KEMPLD_GPIO_LVL, offset, value);
99
+
kempld_gpio_bitop(pld, gpio->out_lvl_reg, offset, value);
101
100
kempld_gpio_bitop(pld, KEMPLD_GPIO_DIR, offset, 1);
102
101
kempld_release_mutex(pld);
103
102
···
153
152
gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
154
153
if (!gpio)
155
154
return -ENOMEM;
155
+
156
+
/* Starting with version 2.8 there is a dedicated register for the
157
+
* output state, earlier versions share the register used to read
158
+
* the line level.
159
+
*/
160
+
if (pld->info.spec_major > 2 || pld->info.spec_minor >= 8)
161
+
gpio->out_lvl_reg = KEMPLD_GPIO_OUT_LVL;
162
+
else
163
+
gpio->out_lvl_reg = KEMPLD_GPIO_LVL;
156
164
157
165
gpio->pld = pld;
158
166