Change in coreboot[master]: qualcomm/sc7280: gpio: Support eGPIO scheme

[Ravi kumar (Code Review)]

Attention is currently required from: Taniya Das.
Hello Taniya Das,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/coreboot/+/58580

to review the following change.

Change subject: qualcomm/sc7280: gpio: Support eGPIO scheme
......................................................................

qualcomm/sc7280: gpio: Support eGPIO scheme

eGPIO is a scheme which allows special power island domain IOs to be
reused as regular chip GPIOs by muxing regular TLMM functions with
Island Domain functions. Allow the eGPIO to be configured via
gpio_configure API to be used as a TLMM gpio.

Change-Id: Ib2598a41ba3bb8a8a2acff8253b5bb78633f89f9
Signed-off-by: Taniya Das 
---
M src/soc/qualcomm/common/gpio.c
M src/soc/qualcomm/common/include/soc/gpio_common.h
2 files changed, 9 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/80/58580/1

diff --git a/src/soc/qualcomm/common/gpio.c b/src/soc/qualcomm/common/gpio.c
index 1ed8e8a..9893545 100644
--- a/src/soc/qualcomm/common/gpio.c
+++ b/src/soc/qualcomm/common/gpio.c
@@ -18,6 +18,9 @@
    	  ((func & GPIO_CFG_FUNC_BMSK) << GPIO_CFG_FUNC_SHFT) |
    	  ((pull & GPIO_CFG_PULL_BMSK) << GPIO_CFG_PULL_SHFT);

+	if ((read32(&regs->cfg) >> GPIO_EGPIO_SHFT) & GPIO_EGPIO_BMSK)
+		reg_val |=  BIT(EGPIO_CFG_EN);
+
    write32(&regs->cfg, reg_val);
 }

diff --git a/src/soc/qualcomm/common/include/soc/gpio_common.h b/src/soc/qualcomm/common/include/soc/gpio_common.h
index 20f947a..fd76631 100644
--- a/src/soc/qualcomm/common/include/soc/gpio_common.h
+++ b/src/soc/qualcomm/common/include/soc/gpio_common.h
@@ -21,6 +21,7 @@
    GPIO_CFG_PULL_BMSK = 0x3,
    GPIO_CFG_FUNC_BMSK = 0xF,
    GPIO_CFG_DRV_BMSK = 0x7,
+	GPIO_EGPIO_BMSK = 0x1,
 };

/* GPIO TLMM INTR: Shift */
@@ -35,6 +36,7 @@
    GPIO_CFG_FUNC_SHFT = 2,
    GPIO_CFG_DRV_SHFT = 6,
    GPIO_CFG_OE_SHFT = 9,
+	GPIO_EGPIO_SHFT = 11,
 };

/* GPIO IO: Shift */
@@ -82,6 +84,10 @@
    IRQ_TYPE_DUAL_EDGE,
 };

+enum egpio_cfg {
+	EGPIO_CFG_EN = 12,
+};
+
 typedef struct {
    u32 addr;
 } gpio_t;