The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
set the TEST_N pin direction.
This patchset :
- adds the Secure Monitor call
- adds support int the pinctrl-meson common code
- adds support for GXBB, GXL and AGX SoCs
Neil Armstrong (5):
meson_sm: add TEST_N pin direction call
pinctrl: meson: Add support to set direction with a secure monitor
call
meson: pinctrl-gxbb: add support for TEST_N pin
meson: pinctrl-gxl: add support for TEST_N pin
meson: pinctrl-axg: add support for TEST_N pin
drivers/firmware/meson/meson_sm.c | 1 +
drivers/pinctrl/meson/Kconfig | 1 +
drivers/pinctrl/meson/pinctrl-meson-axg.c | 4 ++++
drivers/pinctrl/meson/pinctrl-meson-gxbb.c | 4 ++++
drivers/pinctrl/meson/pinctrl-meson-gxl.c | 4 ++++
drivers/pinctrl/meson/pinctrl-meson.c | 31 +++++++++++++++++++++++++-----
drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
include/linux/firmware/meson/meson_sm.h | 1 +
8 files changed, 50 insertions(+), 6 deletions(-)
--
2.7.4
The Amlogic Meson AXG SoCs needs a Secure Monitor call to set the TEST_N
direction, add a special bank to support this pin.
Signed-off-by: Neil Armstrong <[email protected]>
---
drivers/pinctrl/meson/pinctrl-meson-axg.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/pinctrl/meson/pinctrl-meson-axg.c b/drivers/pinctrl/meson/pinctrl-meson-axg.c
index 46a0918..12615d8 100644
--- a/drivers/pinctrl/meson/pinctrl-meson-axg.c
+++ b/drivers/pinctrl/meson/pinctrl-meson-axg.c
@@ -10,6 +10,7 @@
#include <dt-bindings/gpio/meson-axg-gpio.h>
#include "pinctrl-meson.h"
#include "pinctrl-meson-axg-pmx.h"
+#include <linux/firmware/meson/meson_sm.h>
static const struct pinctrl_pin_desc meson_axg_periphs_pins[] = {
MESON_PIN(GPIOZ_0),
@@ -1006,6 +1007,9 @@ static struct meson_bank meson_axg_periphs_banks[] = {
static struct meson_bank meson_axg_aobus_banks[] = {
/* name first last irq pullen pull dir out in */
BANK("AO", GPIOAO_0, GPIOAO_13, 0, 13, 0, 16, 0, 0, 0, 0, 0, 16, 1, 0),
+ /* This PIN Direction must be set using a SMC call, so dir reg offset is the sm call */
+ BANK_SMC("TEST", GPIO_TEST_N, GPIO_TEST_N,
+ -1, -1, 0, 30, 0, 14, SM_TEST_N_DIR, 1, 0, 31, 1, 31),
};
static struct meson_pmx_bank meson_axg_periphs_pmx_banks[] = {
--
2.7.4
The Amlogic Meson GXL & GXM SoCs needs a Secure Monitor call to set the TEST_N
direction, add a special bank to support this pin.
Signed-off-by: Neil Armstrong <[email protected]>
---
drivers/pinctrl/meson/pinctrl-meson-gxl.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/pinctrl/meson/pinctrl-meson-gxl.c b/drivers/pinctrl/meson/pinctrl-meson-gxl.c
index 7dae1d7..d4dc42f 100644
--- a/drivers/pinctrl/meson/pinctrl-meson-gxl.c
+++ b/drivers/pinctrl/meson/pinctrl-meson-gxl.c
@@ -15,6 +15,7 @@
#include <dt-bindings/gpio/meson-gxl-gpio.h>
#include "pinctrl-meson.h"
#include "pinctrl-meson8-pmx.h"
+#include <linux/firmware/meson/meson_sm.h>
static const struct pinctrl_pin_desc meson_gxl_periphs_pins[] = {
MESON_PIN(GPIOZ_0),
@@ -808,6 +809,9 @@ static struct meson_bank meson_gxl_periphs_banks[] = {
static struct meson_bank meson_gxl_aobus_banks[] = {
/* name first last irq pullen pull dir out in */
BANK("AO", GPIOAO_0, GPIOAO_9, 0, 9, 0, 0, 0, 16, 0, 0, 0, 16, 1, 0),
+ /* This PIN Direction must be set using a SMC call, so dir reg offset is the sm call */
+ BANK_SMC("TEST", GPIO_TEST_N, GPIO_TEST_N,
+ -1, -1, 0, 30, 0, 14, SM_TEST_N_DIR, 1, 0, 31, 1, 31),
};
static struct meson_pinctrl_data meson_gxl_periphs_pinctrl_data = {
--
2.7.4
The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
set the TEST_N pin direction.
This patch adds a "smc" boolean to the bank structure to differentiate
the TEST_N bank and call the Secure Monitor in the _input/_output functions.
Signed-off-by: Neil Armstrong <[email protected]>
---
drivers/pinctrl/meson/Kconfig | 1 +
drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
3 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
index c80951d..1b90470 100644
--- a/drivers/pinctrl/meson/Kconfig
+++ b/drivers/pinctrl/meson/Kconfig
@@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
select GPIOLIB
select OF_GPIO
select REGMAP_MMIO
+ select MESON_SM
if PINCTRL_MESON
diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
index 29a458d..8e445aa 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -54,6 +54,7 @@
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
+#include <linux/firmware/meson/meson_sm.h>
#include "../core.h"
#include "../pinctrl-utils.h"
@@ -99,8 +100,14 @@ static void meson_calc_reg_and_bit(struct meson_bank *bank, unsigned int pin,
{
struct meson_reg_desc *desc = &bank->regs[reg_type];
- *reg = desc->reg * 4;
- *bit = desc->bit + pin - bank->first;
+ /* TEST_N pin direction needs to be set using a Secure Monitor call */
+ if (reg_type == REG_DIR && bank->smc) {
+ *reg = desc->reg;
+ *bit = desc->bit;
+ } else {
+ *reg = desc->reg * 4;
+ *bit = desc->bit + pin - bank->first;
+ }
}
static int meson_get_groups_count(struct pinctrl_dev *pcdev)
@@ -342,6 +349,12 @@ static int meson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
meson_calc_reg_and_bit(bank, gpio, REG_DIR, ®, &bit);
+ /* TEST_N pin direction needs to be set using a Secure Monitor call */
+ if (bank->smc) {
+ u32 smc_ret = 0;
+ return meson_sm_call(reg, &smc_ret, 0, 0, 0, 0, 0);
+ }
+
return regmap_update_bits(pc->reg_gpio, reg, BIT(bit), BIT(bit));
}
@@ -358,9 +371,17 @@ static int meson_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
return ret;
meson_calc_reg_and_bit(bank, gpio, REG_DIR, ®, &bit);
- ret = regmap_update_bits(pc->reg_gpio, reg, BIT(bit), 0);
- if (ret)
- return ret;
+ /* TEST_N pin direction needs to be set using a Secure Monitor call */
+ if (bank->smc) {
+ u32 smc_ret = 0;
+ ret = meson_sm_call(reg, &smc_ret, bit, 0, 0, 0, 0);
+ if (ret)
+ return ret;
+ } else {
+ ret = regmap_update_bits(pc->reg_gpio, reg, BIT(bit), 0);
+ if (ret)
+ return ret;
+ }
meson_calc_reg_and_bit(bank, gpio, REG_OUT, ®, &bit);
return regmap_update_bits(pc->reg_gpio, reg, BIT(bit),
diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h
index 12a39110..d32e9a9 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.h
+++ b/drivers/pinctrl/meson/pinctrl-meson.h
@@ -92,6 +92,7 @@ struct meson_bank {
const char *name;
unsigned int first;
unsigned int last;
+ bool smc; /* Direction needs to use a Secure Monitor call */
int irq_first;
int irq_last;
struct meson_reg_desc regs[NUM_REG];
@@ -131,11 +132,12 @@ struct meson_pinctrl {
.num_groups = ARRAY_SIZE(fn ## _groups), \
}
-#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
+#define __BANK(n, f, l, sm, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
{ \
.name = n, \
.first = f, \
.last = l, \
+ .smc = sm, \
.irq_first = fi, \
.irq_last = li, \
.regs = { \
@@ -147,6 +149,12 @@ struct meson_pinctrl {
}, \
}
+#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
+ __BANK(n, f, l, false, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib)
+
+#define BANK_SMC(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
+ __BANK(n, f, l, true, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib)
+
#define MESON_PIN(x) PINCTRL_PIN(x, #x)
/* Common pmx functions */
--
2.7.4
The Amlogic Meson GXBB SoCs needs a Secure Monitor call to set the TEST_N
direction, add a special bank to support this pin.
Signed-off-by: Neil Armstrong <[email protected]>
---
drivers/pinctrl/meson/pinctrl-meson-gxbb.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/pinctrl/meson/pinctrl-meson-gxbb.c b/drivers/pinctrl/meson/pinctrl-meson-gxbb.c
index 2c97a2e0..c0954be 100644
--- a/drivers/pinctrl/meson/pinctrl-meson-gxbb.c
+++ b/drivers/pinctrl/meson/pinctrl-meson-gxbb.c
@@ -15,6 +15,7 @@
#include <dt-bindings/gpio/meson-gxbb-gpio.h>
#include "pinctrl-meson.h"
#include "pinctrl-meson8-pmx.h"
+#include <linux/firmware/meson/meson_sm.h>
static const struct pinctrl_pin_desc meson_gxbb_periphs_pins[] = {
MESON_PIN(GPIOZ_0),
@@ -823,6 +824,9 @@ static struct meson_bank meson_gxbb_periphs_banks[] = {
static struct meson_bank meson_gxbb_aobus_banks[] = {
/* name first last irq pullen pull dir out in */
BANK("AO", GPIOAO_0, GPIOAO_13, 0, 13, 0, 0, 0, 16, 0, 0, 0, 16, 1, 0),
+ /* This PIN Direction must be set using a SMC call, so dir reg offset is the sm call */
+ BANK_SMC("TEST", GPIO_TEST_N, GPIO_TEST_N,
+ -1, -1, 0, 30, 0, 14, SM_TEST_N_DIR, 1, 0, 31, 1, 31),
};
static struct meson_pinctrl_data meson_gxbb_periphs_pinctrl_data = {
--
2.7.4
The Amlogic Meson GX and AXG has a Secure Monitor call to change the
TEST_N pin gpio direction, add it in the supported call list.
Signed-off-by: Neil Armstrong <[email protected]>
---
drivers/firmware/meson/meson_sm.c | 1 +
include/linux/firmware/meson/meson_sm.h | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c
index 0ec2ca8..f407001 100644
--- a/drivers/firmware/meson/meson_sm.c
+++ b/drivers/firmware/meson/meson_sm.c
@@ -48,6 +48,7 @@ struct meson_sm_chip gxbb_chip = {
CMD(SM_EFUSE_READ, 0x82000030),
CMD(SM_EFUSE_WRITE, 0x82000031),
CMD(SM_EFUSE_USER_MAX, 0x82000033),
+ CMD(SM_TEST_N_DIR, 0x82000046),
{ /* sentinel */ },
},
};
diff --git a/include/linux/firmware/meson/meson_sm.h b/include/linux/firmware/meson/meson_sm.h
index 37a5eae..133b1c3 100644
--- a/include/linux/firmware/meson/meson_sm.h
+++ b/include/linux/firmware/meson/meson_sm.h
@@ -17,6 +17,7 @@ enum {
SM_EFUSE_READ,
SM_EFUSE_WRITE,
SM_EFUSE_USER_MAX,
+ SM_TEST_N_DIR,
};
struct meson_sm_firmware;
--
2.7.4
Hi Neil,
On Wed, Aug 1, 2018 at 12:05 PM Neil Armstrong <[email protected]> wrote:
>
> The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
> set the TEST_N pin direction.
> This patch adds a "smc" boolean to the bank structure to differentiate
> the TEST_N bank and call the Secure Monitor in the _input/_output functions.
>
> Signed-off-by: Neil Armstrong <[email protected]>
> ---
> drivers/pinctrl/meson/Kconfig | 1 +
> drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
> drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
> 3 files changed, 36 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
> index c80951d..1b90470 100644
> --- a/drivers/pinctrl/meson/Kconfig
> +++ b/drivers/pinctrl/meson/Kconfig
> @@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
> select GPIOLIB
> select OF_GPIO
> select REGMAP_MMIO
> + select MESON_SM
I wonder why PINCTRL_MESON has to select MESON_SM - shouldn't
PINCTRL_MESON_GXBB, PINCTRL_MESON_GXL and PINCTRL_MESON_AXG select it
instead?
selecting MESON_SM is probably no-op on Meson8 and Meson8b (which
don't have the GX secure monitor), but I haven't tested it yet
Regards
Martin
On 01/08/2018 22:23, Martin Blumenstingl wrote:
> Hi Neil,
>
> On Wed, Aug 1, 2018 at 12:05 PM Neil Armstrong <[email protected]> wrote:
>>
>> The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
>> set the TEST_N pin direction.
>> This patch adds a "smc" boolean to the bank structure to differentiate
>> the TEST_N bank and call the Secure Monitor in the _input/_output functions.
>>
>> Signed-off-by: Neil Armstrong <[email protected]>
>> ---
>> drivers/pinctrl/meson/Kconfig | 1 +
>> drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
>> drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
>> 3 files changed, 36 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
>> index c80951d..1b90470 100644
>> --- a/drivers/pinctrl/meson/Kconfig
>> +++ b/drivers/pinctrl/meson/Kconfig
>> @@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
>> select GPIOLIB
>> select OF_GPIO
>> select REGMAP_MMIO
>> + select MESON_SM
> I wonder why PINCTRL_MESON has to select MESON_SM - shouldn't
> PINCTRL_MESON_GXBB, PINCTRL_MESON_GXL and PINCTRL_MESON_AXG select it
> instead?
> selecting MESON_SM is probably no-op on Meson8 and Meson8b (which
> don't have the GX secure monitor), but I haven't tested it yet
Hi Martin, you are right !
I will fix it on v2..
Neil
>
>
> Regards
> Martin
>
On Thu, 2018-08-02 at 09:52 +0200, Neil Armstrong wrote:
> On 01/08/2018 22:23, Martin Blumenstingl wrote:
> > Hi Neil,
> >
> > On Wed, Aug 1, 2018 at 12:05 PM Neil Armstrong <[email protected]> wrote:
> > >
> > > The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
> > > set the TEST_N pin direction.
> > > This patch adds a "smc" boolean to the bank structure to differentiate
> > > the TEST_N bank and call the Secure Monitor in the _input/_output functions.
> > >
> > > Signed-off-by: Neil Armstrong <[email protected]>
> > > ---
> > > drivers/pinctrl/meson/Kconfig | 1 +
> > > drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
> > > drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
> > > 3 files changed, 36 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
> > > index c80951d..1b90470 100644
> > > --- a/drivers/pinctrl/meson/Kconfig
> > > +++ b/drivers/pinctrl/meson/Kconfig
> > > @@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
> > > select GPIOLIB
> > > select OF_GPIO
> > > select REGMAP_MMIO
> > > + select MESON_SM
> >
> > I wonder why PINCTRL_MESON has to select MESON_SM - shouldn't
> > PINCTRL_MESON_GXBB, PINCTRL_MESON_GXL and PINCTRL_MESON_AXG select it
> > instead?
> > selecting MESON_SM is probably no-op on Meson8 and Meson8b (which
> > don't have the GX secure monitor), but I haven't tested it yet
I'm not so sure about that. meson_sm_call() symbol is used in the common pinctrl
code, so it should be selected when compiled even if meson8b is not going to use
it in the end.
>
> Hi Martin, you are right !
>
> I will fix it on v2..
>
> Neil
>
> >
> >
> > Regards
> > Martin
> >
>
>
On Thu, Aug 2, 2018 at 1:21 PM Jerome Brunet <[email protected]> wrote:
>
> On Thu, 2018-08-02 at 09:52 +0200, Neil Armstrong wrote:
> > On 01/08/2018 22:23, Martin Blumenstingl wrote:
> > > Hi Neil,
> > >
> > > On Wed, Aug 1, 2018 at 12:05 PM Neil Armstrong <[email protected]> wrote:
> > > >
> > > > The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
> > > > set the TEST_N pin direction.
> > > > This patch adds a "smc" boolean to the bank structure to differentiate
> > > > the TEST_N bank and call the Secure Monitor in the _input/_output functions.
> > > >
> > > > Signed-off-by: Neil Armstrong <[email protected]>
> > > > ---
> > > > drivers/pinctrl/meson/Kconfig | 1 +
> > > > drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
> > > > drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
> > > > 3 files changed, 36 insertions(+), 6 deletions(-)
> > > >
> > > > diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
> > > > index c80951d..1b90470 100644
> > > > --- a/drivers/pinctrl/meson/Kconfig
> > > > +++ b/drivers/pinctrl/meson/Kconfig
> > > > @@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
> > > > select GPIOLIB
> > > > select OF_GPIO
> > > > select REGMAP_MMIO
> > > > + select MESON_SM
> > >
> > > I wonder why PINCTRL_MESON has to select MESON_SM - shouldn't
> > > PINCTRL_MESON_GXBB, PINCTRL_MESON_GXL and PINCTRL_MESON_AXG select it
> > > instead?
> > > selecting MESON_SM is probably no-op on Meson8 and Meson8b (which
> > > don't have the GX secure monitor), but I haven't tested it yet
>
> I'm not so sure about that. meson_sm_call() symbol is used in the common pinctrl
> code, so it should be selected when compiled even if meson8b is not going to use
> it in the end.
unfortunately MESON_SM depends on ARM64_4K_PAGES so it can't be
enabled for the 32-bit SoCs
any ideas how to solve this?
Regards
Martin
On 02/08/2018 22:42, Martin Blumenstingl wrote:
> On Thu, Aug 2, 2018 at 1:21 PM Jerome Brunet <[email protected]> wrote:
>>
>> On Thu, 2018-08-02 at 09:52 +0200, Neil Armstrong wrote:
>>> On 01/08/2018 22:23, Martin Blumenstingl wrote:
>>>> Hi Neil,
>>>>
>>>> On Wed, Aug 1, 2018 at 12:05 PM Neil Armstrong <[email protected]> wrote:
>>>>>
>>>>> The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
>>>>> set the TEST_N pin direction.
>>>>> This patch adds a "smc" boolean to the bank structure to differentiate
>>>>> the TEST_N bank and call the Secure Monitor in the _input/_output functions.
>>>>>
>>>>> Signed-off-by: Neil Armstrong <[email protected]>
>>>>> ---
>>>>> drivers/pinctrl/meson/Kconfig | 1 +
>>>>> drivers/pinctrl/meson/pinctrl-meson.c | 31 ++++++++++++++++++++++++++-----
>>>>> drivers/pinctrl/meson/pinctrl-meson.h | 10 +++++++++-
>>>>> 3 files changed, 36 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
>>>>> index c80951d..1b90470 100644
>>>>> --- a/drivers/pinctrl/meson/Kconfig
>>>>> +++ b/drivers/pinctrl/meson/Kconfig
>>>>> @@ -8,6 +8,7 @@ menuconfig PINCTRL_MESON
>>>>> select GPIOLIB
>>>>> select OF_GPIO
>>>>> select REGMAP_MMIO
>>>>> + select MESON_SM
>>>>
>>>> I wonder why PINCTRL_MESON has to select MESON_SM - shouldn't
>>>> PINCTRL_MESON_GXBB, PINCTRL_MESON_GXL and PINCTRL_MESON_AXG select it
>>>> instead?
>>>> selecting MESON_SM is probably no-op on Meson8 and Meson8b (which
>>>> don't have the GX secure monitor), but I haven't tested it yet
>>
>> I'm not so sure about that. meson_sm_call() symbol is used in the common pinctrl
>> code, so it should be selected when compiled even if meson8b is not going to use
>> it in the end.
> unfortunately MESON_SM depends on ARM64_4K_PAGES so it can't be
> enabled for the 32-bit SoCs
> any ideas how to solve this?
I think I'll need to wrap the meson_sm calls around a
#if IS_ENABLED(MESON_SM)
and
select MESON_SM if ARM64
in Kconfig
>
>
> Regards
> Martin
>
On Wed, Aug 1, 2018 at 12:04 PM Neil Armstrong <[email protected]> wrote:
> The Amlogic Meson GX and AXG has a Secure Monitor call to change the
> TEST_N pin gpio direction, add it in the supported call list.
>
> Signed-off-by: Neil Armstrong <[email protected]>
Looks fine to me, could we have Carlo's review on this patch?
Yours,
Linus Walleij
On Wed, Aug 1, 2018 at 12:00 PM Neil Armstrong <[email protected]> wrote:
> The Amlogic Meson GX and AXG SoCs needs to do a Secure Monitor call to
> set the TEST_N pin direction.
> This patchset :
> - adds the Secure Monitor call
> - adds support int the pinctrl-meson common code
> - adds support for GXBB, GXL and AGX SoCs
A lot of trouble to access a single GPIO pin (I guess _N means "active low"?)
Is this line used for something especially important? Would be nice to
include in some commit message like patch 1/5 why we invest so much
energy to accessing this pin.
Just curious. If you're just aiming for feature completion, that is a good
reason as well :D
Yours,
Linus Walleij