gpio: pmic-eic-sprd: Configure the bit corresponding to the EIC through offset

A bank PMIC EIC contains 16 EICs, and the operating registers
are BIT0-BIT15, such as BIT0 of the register operated by EIC0.
Using the one-dimensional array reg[CACHE_NR_REGS] for maintenance
will cause the configuration of other EICs to be affected when
operating a certain EIC. In order to solve this problem, configure
the bit corresponding to the EIC through offset.

Signed-off-by: Wenhua Lin <[e-mail]>
Reviewed-by: Chunyan Zhang <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-pmic-eic-sprd.c

···
 	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
 	u32 offset = irqd_to_hwirq(data);
 
-	pmic_eic->reg[REG_IE] = 0;
-	pmic_eic->reg[REG_TRIG] = 0;
+	pmic_eic->reg[REG_IE] &= ~BIT(offset);
+	pmic_eic->reg[REG_TRIG] &= ~BIT(offset);
 
 	gpiochip_disable_irq(chip, offset);
 }
···
 
 	gpiochip_enable_irq(chip, offset);
 
-	pmic_eic->reg[REG_IE] = 1;
-	pmic_eic->reg[REG_TRIG] = 1;
+	pmic_eic->reg[REG_IE] |= BIT(offset);
+	pmic_eic->reg[REG_TRIG] |= BIT(offset);
 }
 
 static int sprd_pmic_eic_irq_set_type(struct irq_data *data,
···
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+	u32 offset = irqd_to_hwirq(data);
 
 	switch (flow_type) {
 	case IRQ_TYPE_LEVEL_HIGH:
-		pmic_eic->reg[REG_IEV] = 1;
+		pmic_eic->reg[REG_IEV] |= BIT(offset);
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
-		pmic_eic->reg[REG_IEV] = 0;
+		pmic_eic->reg[REG_IEV] &= ~BIT(offset);
 		break;
 	case IRQ_TYPE_EDGE_RISING:
 	case IRQ_TYPE_EDGE_FALLING:
···
 			sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1);
 	} else {
 		sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV,
-				     pmic_eic->reg[REG_IEV]);
+				     !!(pmic_eic->reg[REG_IEV] & BIT(offset)));
 	}
 
 	/* Set irq unmask */
 	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE,
-			     pmic_eic->reg[REG_IE]);
+			     !!(pmic_eic->reg[REG_IE] & BIT(offset)));
 	/* Generate trigger start pulse for debounce EIC */
 	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG,
-			     pmic_eic->reg[REG_TRIG]);
+			     !!(pmic_eic->reg[REG_TRIG] & BIT(offset)));
 
 	mutex_unlock(&pmic_eic->buslock);
 }