[PATCH v5 0/9] rtc: at91sam9: add DT support

[PATCH v5 0/9] rtc: at91sam9: add DT support

[Boris BREZILLON]

Hello,

This patch series adds DT support to the atmel at91sam9 RTC driver.

It also removes any machine specific inclusions to prepare the migration
to multi platform kernel support, and retain the slow clock to prevent
the CCF from disabling it at the end of boot.
  
Best Regards,

Boris

Changes since v4:
 - add a TODO comment to remember removing non DT board support code

Changes since v3:
 - add GPBR DT bindings doc
 - fix a coding style issues
 - add Alexandre's Acked-by
 - change RTT DT bindings

Changes since v2:
 - make use of syscon/regmap to avoid directly requesting/mapping a GPBR
   memory region in the RTT driver

Changes since v1:
 - remove non CCF specific case by adding the appropriate clk_lookup
   entries in arch/arm/mach-at91/<soc-name>.c files

Boris BREZILLON (9):
  rtc: at91sam9: remove references to mach specific headers
  rtc: at91sam9: use standard readl/writel functions instead of raw
    versions
  rtc: at91sam9: replace devm_ioremap by devm_ioremap_resource
  rtc: at91sam9: add DT support
  rtc: at91sam9: make use of syscon/regmap to access GPBR registers
  ARM: at91: add clk_lookup entry for RTT devices
  rtc: at91sam9: use clk API instead of relying on AT91_SLOW_CLOCK
  rtc: at91sam9: add DT bindings documentation
  mfd: syscon: add Atmel GPBR DT bindings documention

 .../devicetree/bindings/mfd/atmel,gpbr.txt         |  15 +++
 .../devicetree/bindings/rtc/atmel,at91sam9-rtc.txt |  23 ++++
 arch/arm/mach-at91/at91sam9260.c                   |   2 +
 arch/arm/mach-at91/at91sam9261.c                   |   2 +
 arch/arm/mach-at91/at91sam9263.c                   |   4 +
 arch/arm/mach-at91/at91sam9g45.c                   |   2 +
 arch/arm/mach-at91/at91sam9rl.c                    |   2 +
 arch/arm/mach-at91/clock.c                         |   2 +-
 arch/arm/mach-at91/clock.h                         |   1 +
 drivers/rtc/Kconfig                                |   1 +
 drivers/rtc/rtc-at91sam9.c                         | 138 ++++++++++++++++-----
 11 files changed, 162 insertions(+), 30 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
 create mode 100644 Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt

-- 
1.9.1

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[PATCH v5 1/9] rtc: at91sam9: remove references to mach specific headers

[Boris BREZILLON]

In order to support multi platform kernel drivers should not include
machine specific headers.
Copy RTT macros in the driver code and remove any machine specific
headers.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 5963743..51f0038 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -22,10 +22,6 @@
 #include <linux/platform_data/atmel.h>
 #include <linux/io.h>
 
-#include <mach/at91_rtt.h>
-#include <mach/cpu.h>
-#include <mach/hardware.h>
-
 /*
  * This driver uses two configurable hardware resources that live in the
  * AT91SAM9 backup power domain (intended to be powered at all times)
@@ -47,6 +43,24 @@
  * registers available, likewise usable for more than "RTC" support.
  */
 
+#define AT91_RTT_MR		0x00			/* Real-time Mode Register */
+#define AT91_RTT_RTPRES		(0xffff << 0)		/* Real-time Timer Prescaler Value */
+#define AT91_RTT_ALMIEN		(1 << 16)		/* Alarm Interrupt Enable */
+#define AT91_RTT_RTTINCIEN	(1 << 17)		/* Real Time Timer Increment Interrupt Enable */
+#define AT91_RTT_RTTRST		(1 << 18)		/* Real Time Timer Restart */
+
+#define AT91_RTT_AR		0x04			/* Real-time Alarm Register */
+#define AT91_RTT_ALMV		(0xffffffff)		/* Alarm Value */
+
+#define AT91_RTT_VR		0x08			/* Real-time Value Register */
+#define AT91_RTT_CRTV		(0xffffffff)		/* Current Real-time Value */
+
+#define AT91_RTT_SR		0x0c			/* Real-time Status Register */
+#define AT91_RTT_ALMS		(1 << 0)		/* Real-time Alarm Status */
+#define AT91_RTT_RTTINC		(1 << 1)		/* Real-time Timer Increment */
+
+#define AT91_SLOW_CLOCK		32768
+
 /*
  * We store ALARM_DISABLED in ALMV to record that no alarm is set.
  * It's also the reset value for that field.
-- 
1.9.1

[PATCH v5 2/9] rtc: at91sam9: use standard readl/writel functions instead of raw versions

[Boris BREZILLON]

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 51f0038..74a9ca0 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -77,14 +77,14 @@ struct sam9_rtc {
 };
 
 #define rtt_readl(rtc, field) \
-	__raw_readl((rtc)->rtt + AT91_RTT_ ## field)
+	readl((rtc)->rtt + AT91_RTT_ ## field)
 #define rtt_writel(rtc, field, val) \
-	__raw_writel((val), (rtc)->rtt + AT91_RTT_ ## field)
+	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
 
 #define gpbr_readl(rtc) \
-	__raw_readl((rtc)->gpbr)
+	readl((rtc)->gpbr)
 #define gpbr_writel(rtc, val) \
-	__raw_writel((val), (rtc)->gpbr)
+	writel((val), (rtc)->gpbr)
 
 /*
  * Read current time and date in RTC
-- 
1.9.1

[PATCH v5 3/9] rtc: at91sam9: replace devm_ioremap by devm_ioremap_resource

[Boris BREZILLON]

Replace devm_ioremap calls by devm_ioremap_resource which already check
resource consistency (resource != NULL) and print an error in case of
failure.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 74a9ca0..38a2693 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -306,18 +306,11 @@ static const struct rtc_class_ops at91_rtc_ops = {
  */
 static int at91_rtc_probe(struct platform_device *pdev)
 {
-	struct resource	*r, *r_gpbr;
+	struct resource	*r;
 	struct sam9_rtc	*rtc;
 	int		ret, irq;
 	u32		mr;
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	r_gpbr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!r || !r_gpbr) {
-		dev_err(&pdev->dev, "need 2 ressources\n");
-		return -ENODEV;
-	}
-
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "failed to get interrupt resource\n");
@@ -335,18 +328,16 @@ static int at91_rtc_probe(struct platform_device *pdev)
 		device_init_wakeup(&pdev->dev, 1);
 
 	platform_set_drvdata(pdev, rtc);
-	rtc->rtt = devm_ioremap(&pdev->dev, r->start, resource_size(r));
-	if (!rtc->rtt) {
-		dev_err(&pdev->dev, "failed to map registers, aborting.\n");
-		return -ENOMEM;
-	}
 
-	rtc->gpbr = devm_ioremap(&pdev->dev, r_gpbr->start,
-				resource_size(r_gpbr));
-	if (!rtc->gpbr) {
-		dev_err(&pdev->dev, "failed to map gpbr registers, aborting.\n");
-		return -ENOMEM;
-	}
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rtc->rtt = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(rtc->rtt))
+		return PTR_ERR(rtc->rtt);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(rtc->gpbr))
+		return PTR_ERR(rtc->rtt);
 
 	mr = rtt_readl(rtc, MR);
 
-- 
1.9.1

Re: [PATCH v5 3/9] rtc: at91sam9: replace devm_ioremap by devm_ioremap_resource

[Alexandre Belloni]

On 22/09/2014 at 11:10:52 +0200, Boris Brezillon wrote :
> Replace devm_ioremap calls by devm_ioremap_resource which already check
> resource consistency (resource != NULL) and print an error in case of
> failure.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

Acked-by: Alexandre Belloni <alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

> ---
>  drivers/rtc/rtc-at91sam9.c | 29 ++++++++++-------------------
>  1 file changed, 10 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> index 74a9ca0..38a2693 100644
> --- a/drivers/rtc/rtc-at91sam9.c
> +++ b/drivers/rtc/rtc-at91sam9.c
> @@ -306,18 +306,11 @@ static const struct rtc_class_ops at91_rtc_ops = {
>   */
>  static int at91_rtc_probe(struct platform_device *pdev)
>  {
> -	struct resource	*r, *r_gpbr;
> +	struct resource	*r;
>  	struct sam9_rtc	*rtc;
>  	int		ret, irq;
>  	u32		mr;
>  
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	r_gpbr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -	if (!r || !r_gpbr) {
> -		dev_err(&pdev->dev, "need 2 ressources\n");
> -		return -ENODEV;
> -	}
> -
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq < 0) {
>  		dev_err(&pdev->dev, "failed to get interrupt resource\n");
> @@ -335,18 +328,16 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  		device_init_wakeup(&pdev->dev, 1);
>  
>  	platform_set_drvdata(pdev, rtc);
> -	rtc->rtt = devm_ioremap(&pdev->dev, r->start, resource_size(r));
> -	if (!rtc->rtt) {
> -		dev_err(&pdev->dev, "failed to map registers, aborting.\n");
> -		return -ENOMEM;
> -	}
>  
> -	rtc->gpbr = devm_ioremap(&pdev->dev, r_gpbr->start,
> -				resource_size(r_gpbr));
> -	if (!rtc->gpbr) {
> -		dev_err(&pdev->dev, "failed to map gpbr registers, aborting.\n");
> -		return -ENOMEM;
> -	}
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	rtc->rtt = devm_ioremap_resource(&pdev->dev, r);
> +	if (IS_ERR(rtc->rtt))
> +		return PTR_ERR(rtc->rtt);
> +
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
> +	if (IS_ERR(rtc->gpbr))
> +		return PTR_ERR(rtc->rtt);
>  
>  	mr = rtt_readl(rtc, MR);
>  
> -- 
> 1.9.1
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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[PATCH v5 4/9] rtc: at91sam9: add DT support

[Boris BREZILLON]

Add of_match_table to the existing driver so that rtc nodes defined in at91
DTs can be attached to this driver.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 38a2693..d72c34d 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -445,6 +445,14 @@ static int at91_rtc_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
 
+#ifdef CONFIG_OF
+static const struct of_device_id at91_rtc_dt_ids[] = {
+	{ .compatible = "atmel,at91sam9260-rtt" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
+#endif
+
 static struct platform_driver at91_rtc_driver = {
 	.probe		= at91_rtc_probe,
 	.remove		= at91_rtc_remove,
@@ -453,6 +461,7 @@ static struct platform_driver at91_rtc_driver = {
 		.name	= "rtc-at91sam9",
 		.owner	= THIS_MODULE,
 		.pm	= &at91_rtc_pm_ops,
+		.of_match_table = of_match_ptr(at91_rtc_dt_ids),
 	},
 };
 
-- 
1.9.1

Re: [PATCH v5 4/9] rtc: at91sam9: add DT support

[Johan Hovold]

[ Please don't drop people from CC. ]

On Mon, Sep 22, 2014 at 11:10:53AM +0200, Boris BREZILLON wrote:
> Add of_match_table to the existing driver so that rtc nodes defined in at91
> DTs can be attached to this driver.

That should be rtt nodes.

Johan

Re: [PATCH v5 4/9] rtc: at91sam9: add DT support

[Boris BREZILLON]

On Mon, 22 Sep 2014 17:17:54 +0200
Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:

> [ Please don't drop people from CC. ]
> 
> On Mon, Sep 22, 2014 at 11:10:53AM +0200, Boris BREZILLON wrote:
> > Add of_match_table to the existing driver so that rtc nodes defined in at91
> > DTs can be attached to this driver.
> 
> That should be rtt nodes.

Oh crap! Hopefully this is the last occurrence of 'rtc' in my commit logs :-).

Best Regards,

Boris

-- 
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Embedded Linux and Kernel engineering
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[PATCH v5 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Boris BREZILLON]

The GPBR registers are not part of the RTT block and thus should not be
defined in the reg property of the rtt node.

Use syscon to provide a proper DT representation and reference the GPBR
syscon device in a new "atmel,time-reg" property which store both the
syscon device phandle and the register offset within the GPBR block.

When using non DT boards, we won't be able to retrieve the syscon regmap,
hence we need to create our own regmap using the memory region defined
in the 2nd memory resource assigned to the RTT platform device.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
---
 drivers/rtc/Kconfig        |  1 +
 drivers/rtc/rtc-at91sam9.c | 64 +++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 56 insertions(+), 9 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index a168e96..7d76da8 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200
 config RTC_DRV_AT91SAM9
 	tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
 	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
+	select MFD_SYSCON
 	help
 	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
 	  (Real Time Timer). These timers are powered by the backup power
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index d72c34d..902cd01 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -21,6 +21,8 @@
 #include <linux/slab.h>
 #include <linux/platform_data/atmel.h>
 #include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 /*
  * This driver uses two configurable hardware resources that live in the
@@ -72,7 +74,8 @@ struct sam9_rtc {
 	void __iomem		*rtt;
 	struct rtc_device	*rtcdev;
 	u32			imr;
-	void __iomem		*gpbr;
+	struct regmap		*gpbr;
+	unsigned int		gpbr_offset;
 	int 			irq;
 };
 
@@ -81,10 +84,19 @@ struct sam9_rtc {
 #define rtt_writel(rtc, field, val) \
 	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
 
-#define gpbr_readl(rtc) \
-	readl((rtc)->gpbr)
-#define gpbr_writel(rtc, val) \
-	writel((val), (rtc)->gpbr)
+static inline unsigned int gpbr_readl(struct sam9_rtc *rtc)
+{
+	unsigned int val;
+
+	regmap_read(rtc->gpbr, rtc->gpbr_offset, &val);
+
+	return val;
+}
+
+static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val)
+{
+	regmap_write(rtc->gpbr, rtc->gpbr_offset, val);
+}
 
 /*
  * Read current time and date in RTC
@@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = {
 	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
 };
 
+static struct regmap_config gpbr_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
 /*
  * Initialize and install RTC driver
  */
@@ -334,10 +352,38 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(rtc->rtt))
 		return PTR_ERR(rtc->rtt);
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
-	if (IS_ERR(rtc->gpbr))
-		return PTR_ERR(rtc->rtt);
+	if (!pdev->dev.of_node) {
+		/*
+		 * TODO: Remove this code chunk when when removing non DT
+		 * board support. Remember to remove the gpbr_regmap_config
+		 * variable too.
+		 */
+		void __iomem *gpbr;
+
+		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		gpbr = devm_ioremap_resource(&pdev->dev, r);
+		if (IS_ERR(gpbr))
+			return PTR_ERR(gpbr);
+
+		rtc->gpbr = regmap_init_mmio(NULL, gpbr,
+					     &gpbr_regmap_config);
+	} else {
+		struct of_phandle_args args;
+
+		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+						"atmel,rtt-rtc-time-reg", 1, 0,
+						&args);
+		if (ret)
+			return ret;
+
+		rtc->gpbr = syscon_node_to_regmap(args.np);
+		rtc->gpbr_offset = args.args[0];
+	}
+
+	if (IS_ERR(rtc->gpbr)) {
+		dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
+		return -ENOMEM;
+	}
 
 	mr = rtt_readl(rtc, MR);
 
-- 
1.9.1

Re: [PATCH v5 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Alexandre Belloni]

On 22/09/2014 at 11:10:54 +0200, Boris Brezillon wrote :
> The GPBR registers are not part of the RTT block and thus should not be
> defined in the reg property of the rtt node.
> 
> Use syscon to provide a proper DT representation and reference the GPBR
> syscon device in a new "atmel,time-reg" property which store both the
> syscon device phandle and the register offset within the GPBR block.
> 
> When using non DT boards, we won't be able to retrieve the syscon regmap,
> hence we need to create our own regmap using the memory region defined
> in the 2nd memory resource assigned to the RTT platform device.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Acked-by: Alexandre Belloni <alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

> ---
>  drivers/rtc/Kconfig        |  1 +
>  drivers/rtc/rtc-at91sam9.c | 64 +++++++++++++++++++++++++++++++++++++++-------
>  2 files changed, 56 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index a168e96..7d76da8 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200
>  config RTC_DRV_AT91SAM9
>  	tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
>  	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
> +	select MFD_SYSCON
>  	help
>  	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
>  	  (Real Time Timer). These timers are powered by the backup power
> diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> index d72c34d..902cd01 100644
> --- a/drivers/rtc/rtc-at91sam9.c
> +++ b/drivers/rtc/rtc-at91sam9.c
> @@ -21,6 +21,8 @@
>  #include <linux/slab.h>
>  #include <linux/platform_data/atmel.h>
>  #include <linux/io.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
>  
>  /*
>   * This driver uses two configurable hardware resources that live in the
> @@ -72,7 +74,8 @@ struct sam9_rtc {
>  	void __iomem		*rtt;
>  	struct rtc_device	*rtcdev;
>  	u32			imr;
> -	void __iomem		*gpbr;
> +	struct regmap		*gpbr;
> +	unsigned int		gpbr_offset;
>  	int 			irq;
>  };
>  
> @@ -81,10 +84,19 @@ struct sam9_rtc {
>  #define rtt_writel(rtc, field, val) \
>  	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
>  
> -#define gpbr_readl(rtc) \
> -	readl((rtc)->gpbr)
> -#define gpbr_writel(rtc, val) \
> -	writel((val), (rtc)->gpbr)
> +static inline unsigned int gpbr_readl(struct sam9_rtc *rtc)
> +{
> +	unsigned int val;
> +
> +	regmap_read(rtc->gpbr, rtc->gpbr_offset, &val);
> +
> +	return val;
> +}
> +
> +static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val)
> +{
> +	regmap_write(rtc->gpbr, rtc->gpbr_offset, val);
> +}
>  
>  /*
>   * Read current time and date in RTC
> @@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = {
>  	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
>  };
>  
> +static struct regmap_config gpbr_regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +};
> +
>  /*
>   * Initialize and install RTC driver
>   */
> @@ -334,10 +352,38 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  	if (IS_ERR(rtc->rtt))
>  		return PTR_ERR(rtc->rtt);
>  
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
> -	if (IS_ERR(rtc->gpbr))
> -		return PTR_ERR(rtc->rtt);
> +	if (!pdev->dev.of_node) {
> +		/*
> +		 * TODO: Remove this code chunk when when removing non DT
> +		 * board support. Remember to remove the gpbr_regmap_config
> +		 * variable too.
> +		 */
> +		void __iomem *gpbr;
> +
> +		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +		gpbr = devm_ioremap_resource(&pdev->dev, r);
> +		if (IS_ERR(gpbr))
> +			return PTR_ERR(gpbr);
> +
> +		rtc->gpbr = regmap_init_mmio(NULL, gpbr,
> +					     &gpbr_regmap_config);
> +	} else {
> +		struct of_phandle_args args;
> +
> +		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
> +						"atmel,rtt-rtc-time-reg", 1, 0,
> +						&args);
> +		if (ret)
> +			return ret;
> +
> +		rtc->gpbr = syscon_node_to_regmap(args.np);
> +		rtc->gpbr_offset = args.args[0];
> +	}
> +
> +	if (IS_ERR(rtc->gpbr)) {
> +		dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
> +		return -ENOMEM;
> +	}
>  
>  	mr = rtt_readl(rtc, MR);
>  
> -- 
> 1.9.1
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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Re: [PATCH v5 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Johan Hovold]

On Mon, Sep 22, 2014 at 11:10:54AM +0200, Boris BREZILLON wrote:
> The GPBR registers are not part of the RTT block and thus should not be
> defined in the reg property of the rtt node.
> 
> Use syscon to provide a proper DT representation and reference the GPBR
> syscon device in a new "atmel,time-reg" property which store both the

You forgot to update the commit message with the new property name.

Johan
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[PATCH v5 6/9] ARM: at91: add clk_lookup entry for RTT devices

[Boris BREZILLON]

First export the clk32k clk.
Then add clk_lookup entries for RTT devices so that rtc-at91sam9 driver
can retrieve and manipulate the slow clk.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 arch/arm/mach-at91/at91sam9260.c | 2 ++
 arch/arm/mach-at91/at91sam9261.c | 2 ++
 arch/arm/mach-at91/at91sam9263.c | 4 ++++
 arch/arm/mach-at91/at91sam9g45.c | 2 ++
 arch/arm/mach-at91/at91sam9rl.c  | 2 ++
 arch/arm/mach-at91/clock.c       | 2 +-
 arch/arm/mach-at91/clock.h       | 1 +
 7 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-at91/at91sam9260.c b/arch/arm/mach-at91/at91sam9260.c
index 3477ba9..a853d4c 100644
--- a/arch/arm/mach-at91/at91sam9260.c
+++ b/arch/arm/mach-at91/at91sam9260.c
@@ -217,6 +217,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID("pclk", "fffbc000.ssc", &ssc_clk),
 	CLKDEV_CON_DEV_ID(NULL, "i2c-at91sam9260.0", &twi_clk),
 	CLKDEV_CON_DEV_ID(NULL, "i2c-at91sam9g20.0", &twi_clk),
+	CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
 	/* more usart lookup table for DT entries */
 	CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
 	CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
@@ -237,6 +238,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID("mci_clk", "fffa8000.mmc", &mmc_clk),
 	CLKDEV_CON_DEV_ID("spi_clk", "fffc8000.spi", &spi0_clk),
 	CLKDEV_CON_DEV_ID("spi_clk", "fffcc000.spi", &spi1_clk),
+	CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
 	/* fake hclk clock */
 	CLKDEV_CON_DEV_ID("hclk", "at91_ohci", &ohci_clk),
 	CLKDEV_CON_ID("pioA", &pioA_clk),
diff --git a/arch/arm/mach-at91/at91sam9261.c b/arch/arm/mach-at91/at91sam9261.c
index fb164a5..3f5a299 100644
--- a/arch/arm/mach-at91/at91sam9261.c
+++ b/arch/arm/mach-at91/at91sam9261.c
@@ -192,6 +192,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_ID("pioA", &pioA_clk),
 	CLKDEV_CON_ID("pioB", &pioB_clk),
 	CLKDEV_CON_ID("pioC", &pioC_clk),
+	CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
 	/* more lookup table for DT entries */
 	CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
 	CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
@@ -209,6 +210,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID(NULL, "fffff400.gpio", &pioA_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioB_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioC_clk),
+	CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
 };
 
 static struct clk_lookup usart_clocks_lookups[] = {
diff --git a/arch/arm/mach-at91/at91sam9263.c b/arch/arm/mach-at91/at91sam9263.c
index 810fa5f..bef5b96 100644
--- a/arch/arm/mach-at91/at91sam9263.c
+++ b/arch/arm/mach-at91/at91sam9263.c
@@ -201,6 +201,8 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID("t0_clk", "atmel_tcb.0", &tcb_clk),
 	CLKDEV_CON_DEV_ID(NULL, "i2c-at91sam9260.0", &twi_clk),
 	CLKDEV_CON_DEV_ID(NULL, "at91sam9rl-pwm", &pwm_clk),
+	CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
+	CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.1", &clk32k),
 	/* fake hclk clock */
 	CLKDEV_CON_DEV_ID("hclk", "at91_ohci", &ohci_clk),
 	CLKDEV_CON_ID("pioA", &pioA_clk),
@@ -227,6 +229,8 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioCDE_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioCDE_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffb8000.pwm", &pwm_clk),
+	CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
+	CLKDEV_CON_DEV_ID(NULL, "fffffd50.rtc", &clk32k),
 };
 
 static struct clk_lookup usart_clocks_lookups[] = {
diff --git a/arch/arm/mach-at91/at91sam9g45.c b/arch/arm/mach-at91/at91sam9g45.c
index 9d45496..69fdfcc 100644
--- a/arch/arm/mach-at91/at91sam9g45.c
+++ b/arch/arm/mach-at91/at91sam9g45.c
@@ -253,6 +253,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID(NULL, "atmel_tdes", &aestdessha_clk),
 	CLKDEV_CON_DEV_ID(NULL, "atmel_aes", &aestdessha_clk),
 	CLKDEV_CON_DEV_ID(NULL, "at91sam9rl-pwm", &pwm_clk),
+	CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
 	/* more usart lookup table for DT entries */
 	CLKDEV_CON_DEV_ID("usart", "ffffee00.serial", &mck),
 	CLKDEV_CON_DEV_ID("usart", "fff8c000.serial", &usart0_clk),
@@ -279,6 +280,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioC_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioDE_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioDE_clk),
+	CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
 
 	CLKDEV_CON_ID("pioA", &pioA_clk),
 	CLKDEV_CON_ID("pioB", &pioB_clk),
diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
index 878d501..a82dc61 100644
--- a/arch/arm/mach-at91/at91sam9rl.c
+++ b/arch/arm/mach-at91/at91sam9rl.c
@@ -205,6 +205,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_ID("pioB", &pioB_clk),
 	CLKDEV_CON_ID("pioC", &pioC_clk),
 	CLKDEV_CON_ID("pioD", &pioD_clk),
+	CLKDEV_CON_DEV_ID(NULL, "rtc-at91sam9.0", &clk32k),
 	/* more lookup table for DT entries */
 	CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
 	CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
@@ -223,6 +224,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
 	CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioB_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioC_clk),
 	CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioD_clk),
+	CLKDEV_CON_DEV_ID(NULL, "fffffd20.rtc", &clk32k),
 	CLKDEV_CON_ID("adc_clk", &tsc_clk),
 };
 
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index 034529d..f5cfed75 100644
--- a/arch/arm/mach-at91/clock.c
+++ b/arch/arm/mach-at91/clock.c
@@ -115,7 +115,7 @@ static u32 at91_pllb_usb_init;
  * 48 MHz (unless no USB function clocks are needed).  The main clock and
  * both PLLs are turned off to run in "slow clock mode" (system suspend).
  */
-static struct clk clk32k = {
+struct clk clk32k = {
 	.name		= "clk32k",
 	.rate_hz	= AT91_SLOW_CLOCK,
 	.users		= 1,		/* always on */
diff --git a/arch/arm/mach-at91/clock.h b/arch/arm/mach-at91/clock.h
index a98a39b..6eb825a 100644
--- a/arch/arm/mach-at91/clock.h
+++ b/arch/arm/mach-at91/clock.h
@@ -34,6 +34,7 @@ struct clk {
 extern int __init clk_register(struct clk *clk);
 extern struct clk mck;
 extern struct clk utmi_clk;
+extern struct clk clk32k;
 
 #define CLKDEV_CON_ID(_id, _clk)			\
 	{						\
-- 
1.9.1

[PATCH v5 7/9] rtc: at91sam9: use clk API instead of relying on AT91_SLOW_CLOCK

[Boris BREZILLON]

The RTT block is using the slow clock which is accessible through the clk
API.
Use the clk API to retrieve, enable and get the slow clk rate instead of
the AT91_SLOW_CLOCK macro (which hardcodes the slow clk rate).
Doing this allows us to reference the clk thus preventing the CCF from
disabling it during the "disable unused" phase.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 902cd01..d20e118 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -23,6 +23,7 @@
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/clk.h>
 
 /*
  * This driver uses two configurable hardware resources that live in the
@@ -61,8 +62,6 @@
 #define AT91_RTT_ALMS		(1 << 0)		/* Real-time Alarm Status */
 #define AT91_RTT_RTTINC		(1 << 1)		/* Real-time Timer Increment */
 
-#define AT91_SLOW_CLOCK		32768
-
 /*
  * We store ALARM_DISABLED in ALMV to record that no alarm is set.
  * It's also the reset value for that field.
@@ -77,6 +76,7 @@ struct sam9_rtc {
 	struct regmap		*gpbr;
 	unsigned int		gpbr_offset;
 	int 			irq;
+	struct clk		*sclk;
 };
 
 #define rtt_readl(rtc, field) \
@@ -328,6 +328,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	struct sam9_rtc	*rtc;
 	int		ret, irq;
 	u32		mr;
+	unsigned int	sclk_rate;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
@@ -385,11 +386,27 @@ static int at91_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	rtc->sclk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(rtc->sclk))
+		return PTR_ERR(rtc->sclk);
+
+	sclk_rate = clk_get_rate(rtc->sclk);
+	if (!sclk_rate || sclk_rate > AT91_RTT_RTTRST) {
+		dev_err(&pdev->dev, "Invalid slow clock rate");
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(rtc->sclk);
+	if (ret) {
+		dev_err(&pdev->dev, "Could not enable slow clock");
+		return ret;
+	}
+
 	mr = rtt_readl(rtc, MR);
 
 	/* unless RTT is counting at 1 Hz, re-initialize it */
-	if ((mr & AT91_RTT_RTPRES) != AT91_SLOW_CLOCK) {
-		mr = AT91_RTT_RTTRST | (AT91_SLOW_CLOCK & AT91_RTT_RTPRES);
+	if ((mr & AT91_RTT_RTPRES) != sclk_rate) {
+		mr = AT91_RTT_RTTRST | (sclk_rate & AT91_RTT_RTPRES);
 		gpbr_writel(rtc, 0);
 	}
 
@@ -434,6 +451,9 @@ static int at91_rtc_remove(struct platform_device *pdev)
 	/* disable all interrupts */
 	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
 
+	if (!IS_ERR(rtc->sclk))
+		clk_disable_unprepare(rtc->sclk);
+
 	return 0;
 }
 
-- 
1.9.1

[PATCH v5 8/9] rtc: at91sam9: add DT bindings documentation

[Boris BREZILLON]

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
---
 .../devicetree/bindings/rtc/atmel,at91sam9-rtc.txt | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt

diff --git a/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
new file mode 100644
index 0000000..5b2bb73
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
@@ -0,0 +1,23 @@
+Atmel AT91SAM9260 Real Time Timer
+
+Required properties:
+- compatible: should be: "atmel,at91sam9260-rtt"
+- reg: should encode the memory region of the RTT controller
+- interrupts: rtc alarm/event interrupt
+- clocks: should contain one clock pointing the the slow clk
+- atmel,rtt-rtc-time-reg: should encode the GPBR register used to store
+	the RTC time. The first cell should point to the GPBR node and
+	the second one encode the offset within the GPBR block (or in
+	other words, the GPBR register used to store the current time
+	value).
+
+
+Example:
+
+rtt@fffffe00 {
+	compatible = "atmel,at91sam9260-rtt";
+	reg = <0xfffffd20 0x10>;
+	interrupts = <1 4 7>;
+	clocks = <&clk32k>;
+	atmel,rtt-rtc-time-reg = <&gpbr 0x0>;
+};
-- 
1.9.1

Re: [PATCH v5 8/9] rtc: at91sam9: add DT bindings documentation

[Johan Hovold]

On Mon, Sep 22, 2014 at 11:10:57AM +0200, Boris BREZILLON wrote:
> Signed-off-by: Boris BREZILLON <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
>  .../devicetree/bindings/rtc/atmel,at91sam9-rtc.txt | 23 ++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
> 
> diff --git a/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
> new file mode 100644
> index 0000000..5b2bb73
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
> @@ -0,0 +1,23 @@
> +Atmel AT91SAM9260 Real Time Timer
> +
> +Required properties:
> +- compatible: should be: "atmel,at91sam9260-rtt"
> +- reg: should encode the memory region of the RTT controller
> +- interrupts: rtc alarm/event interrupt

rtt alarm

> +- clocks: should contain one clock pointing the the slow clk
> +- atmel,rtt-rtc-time-reg: should encode the GPBR register used to store
> +	the RTC time. The first cell should point to the GPBR node and

"used to store the time base when the RTT is used as an RTC"?

Johan
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[PATCH v5 9/9] mfd: syscon: add Atmel GPBR DT bindings documention

[Boris BREZILLON]

The GPBR block provides a set of battery-backed registers that can be used
to save data which need to be kept when the system is powered down and
VDD-core is maintained by an external battery.

A typical usage is the RTT block (when used as an RTC) which needs one of
those registers to save the current time.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
---
 Documentation/devicetree/bindings/mfd/atmel,gpbr.txt | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,gpbr.txt

diff --git a/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt b/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
new file mode 100644
index 0000000..a285695
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
@@ -0,0 +1,15 @@
+* Device tree bindings for Atmel GPBR (General Purpose Backup Registers)
+
+The GPBR are a set of battery-backed registers.
+
+Required properties:
+- compatible:		"atmel,at91sam9260-gpbr", "syscon"
+- reg:			contains offset/length value of the GPBR memory
+			region.
+
+Example:
+
+gpbr: gpbr@fffffd50 {
+	compatible = "atmel,at91sam9260-gpbr", "syscon";
+	reg = <0xfffffd50 0x10>;
+};
-- 
1.9.1

[PATCH v4 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Boris BREZILLON]

The GPBR registers are not part of the RTT block and thus should not be
defined in the reg property of the rtt node.

Use syscon to provide a proper DT representation and reference the GPBR
syscon device in a new "atmel,time-reg" property which store both the
syscon device phandle and the register offset within the GPBR block.

When using non DT boards, we won't be able to retrieve the syscon regmap,
hence we need to create our own regmap using the memory region defined
in the 2nd memory resource assigned to the RTT platform device.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
---
 drivers/rtc/Kconfig        |  1 +
 drivers/rtc/rtc-at91sam9.c | 59 +++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index a168e96..7d76da8 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200
 config RTC_DRV_AT91SAM9
 	tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
 	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
+	select MFD_SYSCON
 	help
 	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
 	  (Real Time Timer). These timers are powered by the backup power
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index d72c34d..e1b7109 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -21,6 +21,8 @@
 #include <linux/slab.h>
 #include <linux/platform_data/atmel.h>
 #include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 /*
  * This driver uses two configurable hardware resources that live in the
@@ -72,7 +74,8 @@ struct sam9_rtc {
 	void __iomem		*rtt;
 	struct rtc_device	*rtcdev;
 	u32			imr;
-	void __iomem		*gpbr;
+	struct regmap		*gpbr;
+	unsigned int		gpbr_offset;
 	int 			irq;
 };
 
@@ -81,10 +84,19 @@ struct sam9_rtc {
 #define rtt_writel(rtc, field, val) \
 	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
 
-#define gpbr_readl(rtc) \
-	readl((rtc)->gpbr)
-#define gpbr_writel(rtc, val) \
-	writel((val), (rtc)->gpbr)
+static inline unsigned int gpbr_readl(struct sam9_rtc *rtc)
+{
+	unsigned int val;
+
+	regmap_read(rtc->gpbr, rtc->gpbr_offset, &val);
+
+	return val;
+}
+
+static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val)
+{
+	regmap_write(rtc->gpbr, rtc->gpbr_offset, val);
+}
 
 /*
  * Read current time and date in RTC
@@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = {
 	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
 };
 
+static struct regmap_config gpbr_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
 /*
  * Initialize and install RTC driver
  */
@@ -334,10 +352,33 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(rtc->rtt))
 		return PTR_ERR(rtc->rtt);
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
-	if (IS_ERR(rtc->gpbr))
-		return PTR_ERR(rtc->rtt);
+	if (!pdev->dev.of_node) {
+		void __iomem *gpbr;
+
+		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		gpbr = devm_ioremap_resource(&pdev->dev, r);
+		if (IS_ERR(gpbr))
+			return PTR_ERR(gpbr);
+
+		rtc->gpbr = regmap_init_mmio(NULL, gpbr,
+					     &gpbr_regmap_config);
+	} else {
+		struct of_phandle_args args;
+
+		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+						       "atmel,time-reg", 1, 0,
+						       &args);
+		if (ret)
+			return ret;
+
+		rtc->gpbr = syscon_node_to_regmap(args.np);
+		rtc->gpbr_offset = args.args[0];
+	}
+
+	if (IS_ERR(rtc->gpbr)) {
+		dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
+		return -ENOMEM;
+	}
 
 	mr = rtt_readl(rtc, MR);
 
-- 
1.9.1

[PATCH v5 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Boris BREZILLON]

The GPBR registers are not part of the RTT block and thus should not be
defined in the reg property of the rtt node.

Use syscon to provide a proper DT representation and reference the GPBR
syscon device in a new "atmel,time-reg" property which store both the
syscon device phandle and the register offset within the GPBR block.

When using non DT boards, we won't be able to retrieve the syscon regmap,
hence we need to create our own regmap using the memory region defined
in the 2nd memory resource assigned to the RTT platform device.

Signed-off-by: Boris BREZILLON <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/rtc/Kconfig        |  1 +
 drivers/rtc/rtc-at91sam9.c | 59 +++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index a168e96..7d76da8 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200
 config RTC_DRV_AT91SAM9
 	tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
 	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
+	select MFD_SYSCON
 	help
 	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
 	  (Real Time Timer). These timers are powered by the backup power
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index d72c34d..944e317 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -21,6 +21,8 @@
 #include <linux/slab.h>
 #include <linux/platform_data/atmel.h>
 #include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 /*
  * This driver uses two configurable hardware resources that live in the
@@ -72,7 +74,8 @@ struct sam9_rtc {
 	void __iomem		*rtt;
 	struct rtc_device	*rtcdev;
 	u32			imr;
-	void __iomem		*gpbr;
+	struct regmap		*gpbr;
+	unsigned int		gpbr_offset;
 	int 			irq;
 };
 
@@ -81,10 +84,19 @@ struct sam9_rtc {
 #define rtt_writel(rtc, field, val) \
 	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
 
-#define gpbr_readl(rtc) \
-	readl((rtc)->gpbr)
-#define gpbr_writel(rtc, val) \
-	writel((val), (rtc)->gpbr)
+static inline unsigned int gpbr_readl(struct sam9_rtc *rtc)
+{
+	unsigned int val;
+
+	regmap_read(rtc->gpbr, rtc->gpbr_offset, &val);
+
+	return val;
+}
+
+static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val)
+{
+	regmap_write(rtc->gpbr, rtc->gpbr_offset, val);
+}
 
 /*
  * Read current time and date in RTC
@@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = {
 	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
 };
 
+static struct regmap_config gpbr_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
 /*
  * Initialize and install RTC driver
  */
@@ -334,10 +352,33 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(rtc->rtt))
 		return PTR_ERR(rtc->rtt);
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
-	if (IS_ERR(rtc->gpbr))
-		return PTR_ERR(rtc->rtt);
+	if (!pdev->dev.of_node) {
+		void __iomem *gpbr;
+
+		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		gpbr = devm_ioremap_resource(&pdev->dev, r);
+		if (IS_ERR(gpbr))
+			return PTR_ERR(gpbr);
+
+		rtc->gpbr = regmap_init_mmio(NULL, gpbr,
+					     &gpbr_regmap_config);
+	} else {
+		struct of_phandle_args args;
+
+		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+						"atmel,rtt-rtc-time-reg", 1, 0,
+						&args);
+		if (ret)
+			return ret;
+
+		rtc->gpbr = syscon_node_to_regmap(args.np);
+		rtc->gpbr_offset = args.args[0];
+	}
+
+	if (IS_ERR(rtc->gpbr)) {
+		dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
+		return -ENOMEM;
+	}
 
 	mr = rtt_readl(rtc, MR);
 
-- 
1.9.1

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Re: [PATCH v5 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Alexandre Belloni]

On 11/09/2014 at 15:53:08 +0200, Boris Brezillon wrote :
> The GPBR registers are not part of the RTT block and thus should not be
> defined in the reg property of the rtt node.
> 
> Use syscon to provide a proper DT representation and reference the GPBR
> syscon device in a new "atmel,time-reg" property which store both the
> syscon device phandle and the register offset within the GPBR block.
> 
> When using non DT boards, we won't be able to retrieve the syscon regmap,
> hence we need to create our own regmap using the memory region defined
> in the 2nd memory resource assigned to the RTT platform device.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
>  drivers/rtc/Kconfig        |  1 +
>  drivers/rtc/rtc-at91sam9.c | 59 +++++++++++++++++++++++++++++++++++++++-------
>  2 files changed, 51 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index a168e96..7d76da8 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200
>  config RTC_DRV_AT91SAM9
>  	tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
>  	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
> +	select MFD_SYSCON
>  	help
>  	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
>  	  (Real Time Timer). These timers are powered by the backup power
> diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> index d72c34d..944e317 100644
> --- a/drivers/rtc/rtc-at91sam9.c
> +++ b/drivers/rtc/rtc-at91sam9.c
> @@ -21,6 +21,8 @@
>  #include <linux/slab.h>
>  #include <linux/platform_data/atmel.h>
>  #include <linux/io.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
>  
>  /*
>   * This driver uses two configurable hardware resources that live in the
> @@ -72,7 +74,8 @@ struct sam9_rtc {
>  	void __iomem		*rtt;
>  	struct rtc_device	*rtcdev;
>  	u32			imr;
> -	void __iomem		*gpbr;
> +	struct regmap		*gpbr;
> +	unsigned int		gpbr_offset;
>  	int 			irq;
>  };
>  
> @@ -81,10 +84,19 @@ struct sam9_rtc {
>  #define rtt_writel(rtc, field, val) \
>  	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
>  
> -#define gpbr_readl(rtc) \
> -	readl((rtc)->gpbr)
> -#define gpbr_writel(rtc, val) \
> -	writel((val), (rtc)->gpbr)
> +static inline unsigned int gpbr_readl(struct sam9_rtc *rtc)
> +{
> +	unsigned int val;
> +
> +	regmap_read(rtc->gpbr, rtc->gpbr_offset, &val);
> +
> +	return val;
> +}
> +
> +static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val)
> +{
> +	regmap_write(rtc->gpbr, rtc->gpbr_offset, val);
> +}
>  
>  /*
>   * Read current time and date in RTC
> @@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = {
>  	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
>  };
>  
> +static struct regmap_config gpbr_regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +};
> +
>  /*
>   * Initialize and install RTC driver
>   */
> @@ -334,10 +352,33 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  	if (IS_ERR(rtc->rtt))
>  		return PTR_ERR(rtc->rtt);
>  
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
> -	if (IS_ERR(rtc->gpbr))
> -		return PTR_ERR(rtc->rtt);
> +	if (!pdev->dev.of_node) {
> +		void __iomem *gpbr;
> +
> +		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +		gpbr = devm_ioremap_resource(&pdev->dev, r);
> +		if (IS_ERR(gpbr))
> +			return PTR_ERR(gpbr);
> +

Maybe you could add a comment here as this is soon to be dead code.

> +		rtc->gpbr = regmap_init_mmio(NULL, gpbr,
> +					     &gpbr_regmap_config);
> +	} else {
> +		struct of_phandle_args args;
> +
> +		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
> +						"atmel,rtt-rtc-time-reg", 1, 0,
> +						&args);
> +		if (ret)
> +			return ret;
> +
> +		rtc->gpbr = syscon_node_to_regmap(args.np);
> +		rtc->gpbr_offset = args.args[0];
> +	}
> +
> +	if (IS_ERR(rtc->gpbr)) {
> +		dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
> +		return -ENOMEM;
> +	}
>  
>  	mr = rtt_readl(rtc, MR);
>  
> -- 
> 1.9.1
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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Re: [PATCH v5 5/9] rtc: at91sam9: make use of syscon/regmap to access GPBR registers

[Boris BREZILLON]

On Thu, 11 Sep 2014 19:42:09 +0200
Alexandre Belloni <alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:

> On 11/09/2014 at 15:53:08 +0200, Boris Brezillon wrote :
> > The GPBR registers are not part of the RTT block and thus should not be
> > defined in the reg property of the rtt node.
> > 
> > Use syscon to provide a proper DT representation and reference the GPBR
> > syscon device in a new "atmel,time-reg" property which store both the
> > syscon device phandle and the register offset within the GPBR block.
> > 
> > When using non DT boards, we won't be able to retrieve the syscon regmap,
> > hence we need to create our own regmap using the memory region defined
> > in the 2nd memory resource assigned to the RTT platform device.
> > 
> > Signed-off-by: Boris BREZILLON <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> > ---
> >  drivers/rtc/Kconfig        |  1 +
> >  drivers/rtc/rtc-at91sam9.c | 59 +++++++++++++++++++++++++++++++++++++++-------
> >  2 files changed, 51 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> > index a168e96..7d76da8 100644
> > --- a/drivers/rtc/Kconfig
> > +++ b/drivers/rtc/Kconfig
> > @@ -1081,6 +1081,7 @@ config RTC_DRV_AT91RM9200
> >  config RTC_DRV_AT91SAM9
> >  	tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
> >  	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
> > +	select MFD_SYSCON
> >  	help
> >  	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
> >  	  (Real Time Timer). These timers are powered by the backup power
> > diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> > index d72c34d..944e317 100644
> > --- a/drivers/rtc/rtc-at91sam9.c
> > +++ b/drivers/rtc/rtc-at91sam9.c
> > @@ -21,6 +21,8 @@
> >  #include <linux/slab.h>
> >  #include <linux/platform_data/atmel.h>
> >  #include <linux/io.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/regmap.h>
> >  
> >  /*
> >   * This driver uses two configurable hardware resources that live in the
> > @@ -72,7 +74,8 @@ struct sam9_rtc {
> >  	void __iomem		*rtt;
> >  	struct rtc_device	*rtcdev;
> >  	u32			imr;
> > -	void __iomem		*gpbr;
> > +	struct regmap		*gpbr;
> > +	unsigned int		gpbr_offset;
> >  	int 			irq;
> >  };
> >  
> > @@ -81,10 +84,19 @@ struct sam9_rtc {
> >  #define rtt_writel(rtc, field, val) \
> >  	writel((val), (rtc)->rtt + AT91_RTT_ ## field)
> >  
> > -#define gpbr_readl(rtc) \
> > -	readl((rtc)->gpbr)
> > -#define gpbr_writel(rtc, val) \
> > -	writel((val), (rtc)->gpbr)
> > +static inline unsigned int gpbr_readl(struct sam9_rtc *rtc)
> > +{
> > +	unsigned int val;
> > +
> > +	regmap_read(rtc->gpbr, rtc->gpbr_offset, &val);
> > +
> > +	return val;
> > +}
> > +
> > +static inline void gpbr_writel(struct sam9_rtc *rtc, unsigned int val)
> > +{
> > +	regmap_write(rtc->gpbr, rtc->gpbr_offset, val);
> > +}
> >  
> >  /*
> >   * Read current time and date in RTC
> > @@ -301,6 +313,12 @@ static const struct rtc_class_ops at91_rtc_ops = {
> >  	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
> >  };
> >  
> > +static struct regmap_config gpbr_regmap_config = {
> > +	.reg_bits = 32,
> > +	.val_bits = 32,
> > +	.reg_stride = 4,
> > +};
> > +
> >  /*
> >   * Initialize and install RTC driver
> >   */
> > @@ -334,10 +352,33 @@ static int at91_rtc_probe(struct platform_device *pdev)
> >  	if (IS_ERR(rtc->rtt))
> >  		return PTR_ERR(rtc->rtt);
> >  
> > -	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> > -	rtc->gpbr = devm_ioremap_resource(&pdev->dev, r);
> > -	if (IS_ERR(rtc->gpbr))
> > -		return PTR_ERR(rtc->rtt);
> > +	if (!pdev->dev.of_node) {
> > +		void __iomem *gpbr;
> > +
> > +		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> > +		gpbr = devm_ioremap_resource(&pdev->dev, r);
> > +		if (IS_ERR(gpbr))
> > +			return PTR_ERR(gpbr);
> > +
> 
> Maybe you could add a comment here as this is soon to be dead code.

Sure. I'll add a TODO comment.

Thanks.

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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