openwrt/target/linux/ipq806x/patches/0030-pinctrl-msm-Replace-lookup-tables-with-math.patch

From e34d9fdac8182f6ce8933501fea6e84664060bf0 Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@codeaurora.org>
Date: Thu, 6 Mar 2014 22:44:44 -0800
Subject: [PATCH 030/182] pinctrl: msm: Replace lookup tables with math

We don't need to waste space with these lookup tables, just do
the math directly.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/pinctrl/pinctrl-msm.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/pinctrl/pinctrl-msm.c
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -258,8 +258,10 @@ static int msm_config_set(struct pinctrl
 #define MSM_PULL_DOWN	1
 #define MSM_PULL_UP	3
 
-static const unsigned msm_regval_to_drive[] = { 2, 4, 6, 8, 10, 12, 14, 16 };
-static const unsigned msm_drive_to_regval[] = { -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, 6, -1, 7 };
+static unsigned msm_regval_to_drive(u32 val)
+{
+	return (val + 1) * 2;
+}
 
 static int msm_config_group_get(struct pinctrl_dev *pctldev,
 				unsigned int group,
@@ -296,7 +298,7 @@ static int msm_config_group_get(struct p
 		arg = arg == MSM_PULL_UP;
 		break;
 	case PIN_CONFIG_DRIVE_STRENGTH:
-		arg = msm_regval_to_drive[arg];
+		arg = msm_regval_to_drive(arg);
 		break;
 	default:
 		dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
@@ -349,10 +351,10 @@ static int msm_config_group_set(struct p
 			break;
 		case PIN_CONFIG_DRIVE_STRENGTH:
 			/* Check for invalid values */
-			if (arg >= ARRAY_SIZE(msm_drive_to_regval))
+			if (arg > 16 || arg < 2 || (arg % 2) != 0)
 				arg = -1;
 			else
-				arg = msm_drive_to_regval[arg];
+				arg = (arg / 2) - 1;
 			break;
 		default:
 			dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
@@ -531,7 +533,7 @@ static void msm_gpio_dbg_show_one(struct
 	pull = (ctl_reg >> g->pull_bit) & 3;
 
 	seq_printf(s, " %-8s: %-3s %d", g->name, is_out ? "out" : "in", func);
-	seq_printf(s, " %dmA", msm_regval_to_drive[drive]);
+	seq_printf(s, " %dmA", msm_regval_to_drive(drive));
 	seq_printf(s, " %s", pulls[pull]);
 }