linux-kernel - [PATCH 5/7] pinctrl: msm: Replace lookup tables with math

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Date:	Thu,  6 Mar 2014 22:44:44 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: [PATCH 5/7] pinctrl: msm: Replace lookup tables with math

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

Cc: Bjorn Andersson <bjorn.andersson@...ymobile.com>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
 drivers/pinctrl/pinctrl-msm.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-msm.c b/drivers/pinctrl/pinctrl-msm.c
index 5daad720ecbb..58c23f138d7a 100644
--- a/drivers/pinctrl/pinctrl-msm.c
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -260,8 +260,10 @@ static int msm_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
 #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,
@@ -298,7 +300,7 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
 		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",
@@ -351,10 +353,10 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 			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",
@@ -533,7 +535,7 @@ static void msm_gpio_dbg_show_one(struct seq_file *s,
 	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]);
 }
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

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