Patchwork [V2,1/4] ARM: tegra: pmc: convert PMC driver to support DT only

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Submitter Joseph Lo
Date Feb. 27, 2013, 2:28 a.m.
Message ID <1361932087-13372-2-git-send-email-josephl@nvidia.com>
Download mbox | patch
Permalink /patch/223465/
State Superseded, archived
Headers show

Comments

Joseph Lo - Feb. 27, 2013, 2:28 a.m.
The Tegra kernel only support boot from DT now. Clean up the PMC driver
to support DT only, that includes:

* remove the ifdef of CONFIG_OF
* replace the static mapping of PMC addr to map from DT

Signed-off-by: Joseph Lo <josephl@nvidia.com>
---
V2:
* removing the change from readl_relaxed back to readl, same with the
  write function
* adding a BUG() when there is no PMC node in DT
* removeing the redundancy of_have_populated_dt() check
---
 arch/arm/mach-tegra/pmc.c | 54 ++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 29 deletions(-)
Stephen Warren - Feb. 27, 2013, 6:53 p.m.
On 02/26/2013 07:28 PM, Joseph Lo wrote:
> The Tegra kernel only support boot from DT now. Clean up the PMC driver
> to support DT only, that includes:
> 
> * remove the ifdef of CONFIG_OF
> * replace the static mapping of PMC addr to map from DT

> diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c

>  static inline void tegra_pmc_writel(u32 val, u32 reg)
>  {
> -	writel(val, IO_ADDRESS(TEGRA_PMC_BASE + reg));
> +	writel(val, (tegra_pmc_base + reg));

There are redundant () there.

> +static void tegra_pmc_parse_dt(void)
>  {
> +	struct device_node *np;
>  
> +	np = of_find_matching_node(NULL, matches);
> +	if (np) {

Why not:

BUG_ON(!np);

That way, you can get rid of if if/else blocks, and remove one level of
indentation throughout this function. I already mentioned this internally...
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Patch

diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
index 5d79d34..f7d63ab 100644
--- a/arch/arm/mach-tegra/pmc.c
+++ b/arch/arm/mach-tegra/pmc.c
@@ -1,5 +1,5 @@ 
 /*
- * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ * Copyright (C) 2012,2013 NVIDIA CORPORATION. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -18,59 +18,55 @@ 
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <linux/of.h>
-
-#include "iomap.h"
+#include <linux/of_address.h>
 
 #define PMC_CTRL		0x0
 #define PMC_CTRL_INTR_LOW	(1 << 17)
 
+static void __iomem *tegra_pmc_base;
+static bool tegra_pmc_invert_interrupt;
+
 static inline u32 tegra_pmc_readl(u32 reg)
 {
-	return readl(IO_ADDRESS(TEGRA_PMC_BASE + reg));
+	return readl(tegra_pmc_base + reg);
 }
 
 static inline void tegra_pmc_writel(u32 val, u32 reg)
 {
-	writel(val, IO_ADDRESS(TEGRA_PMC_BASE + reg));
+	writel(val, (tegra_pmc_base + reg));
 }
 
-#ifdef CONFIG_OF
 static const struct of_device_id matches[] __initconst = {
 	{ .compatible = "nvidia,tegra114-pmc" },
 	{ .compatible = "nvidia,tegra30-pmc" },
 	{ .compatible = "nvidia,tegra20-pmc" },
 	{ }
 };
-#endif
 
-void __init tegra_pmc_init(void)
+static void tegra_pmc_parse_dt(void)
 {
-	/*
-	 * For now, Harmony is the only board that uses the PMC, and it wants
-	 * the signal inverted. Seaboard would too if it used the PMC.
-	 * Hopefully by the time other boards want to use the PMC, everything
-	 * will be device-tree, or they also want it inverted.
-	 */
-	bool invert_interrupt = true;
-	u32 val;
-
-#ifdef CONFIG_OF
-	if (of_have_populated_dt()) {
-		struct device_node *np;
+	struct device_node *np;
 
-		invert_interrupt = false;
+	np = of_find_matching_node(NULL, matches);
+	if (np) {
+		tegra_pmc_base = of_iomap(np, 0);
 
-		np = of_find_matching_node(NULL, matches);
-		if (np) {
-			if (of_find_property(np, "nvidia,invert-interrupt",
-						NULL))
-				invert_interrupt = true;
-		}
+		tegra_pmc_invert_interrupt = of_property_read_bool(np,
+					     "nvidia,invert-interrupt");
+	} else {
+		/* Should not be here, the PMC DT node should always exist. */
+		BUG();
 	}
-#endif
+}
+
+void __init tegra_pmc_init(void)
+{
+	u32 val;
+
+	tegra_pmc_parse_dt();
 
 	val = tegra_pmc_readl(PMC_CTRL);
-	if (invert_interrupt)
+	if (tegra_pmc_invert_interrupt)
 		val |= PMC_CTRL_INTR_LOW;
 	else
 		val &= ~PMC_CTRL_INTR_LOW;