dt-bindings: pinctrl: samsung: Add pin drive definitions for Exynos850

All Exynos850 GPIO blocks can use EXYNOS5420_PIN_DRV* definitions,
except GPIO_HSI block. Add pin drive strength definitions for GPIO_HSI
block correspondingly.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211217161549.24836-6-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

include/dt-bindings/pinctrl/samsung.h

@@ -36,7 +36,10 @@
 #define EXYNOS5260_PIN_DRV_LV4		2
 #define EXYNOS5260_PIN_DRV_LV6		3
 
-/* Drive strengths for Exynos5410, Exynos542x and Exynos5800 */
+/*
+ * Drive strengths for Exynos5410, Exynos542x, Exynos5800 and Exynos850 (except
+ * GPIO_HSI block)
+ */
 #define EXYNOS5420_PIN_DRV_LV1		0
 #define EXYNOS5420_PIN_DRV_LV2		1
 #define EXYNOS5420_PIN_DRV_LV3		2
@@ -56,6 +59,14 @@
 #define EXYNOS5433_PIN_DRV_SLOW_SR5	0xc
 #define EXYNOS5433_PIN_DRV_SLOW_SR6	0xf
 
+/* Drive strengths for Exynos850 GPIO_HSI block */
+#define EXYNOS850_HSI_PIN_DRV_LV1	0	/* 1x   */
+#define EXYNOS850_HSI_PIN_DRV_LV1_5	1	/* 1.5x */
+#define EXYNOS850_HSI_PIN_DRV_LV2	2	/* 2x   */
+#define EXYNOS850_HSI_PIN_DRV_LV2_5	3	/* 2.5x */
+#define EXYNOS850_HSI_PIN_DRV_LV3	4	/* 3x   */
+#define EXYNOS850_HSI_PIN_DRV_LV4	5	/* 4x   */
+
 #define EXYNOS_PIN_FUNC_INPUT		0
 #define EXYNOS_PIN_FUNC_OUTPUT		1
 #define EXYNOS_PIN_FUNC_2		2