This patch modifies the tegra i2c driver so that it can be initiailized
using the device tree along with the devices connected to the i2c bus.
Signed-off-by: John Bonesio <[email protected]>
Acked-by: Grant Likely <[email protected]>
Acked-by: OIof Johansson <[email protected]>
---
drivers/i2c/busses/i2c-tegra.c | 17 ++++++++++++++++-
1 files changed, 16 insertions(+), 1 deletions(-)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4d93196..d2393e6 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -26,6 +26,7 @@
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/i2c-tegra.h>
+#include <linux/of_i2c.h>
#include <asm/unaligned.h>
@@ -540,6 +541,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
struct resource *iomem;
struct clk *clk;
struct clk *i2c_clk;
+ const unsigned int *prop;
void *base;
int irq;
int ret = 0;
@@ -597,7 +599,17 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->irq = irq;
i2c_dev->cont_id = pdev->id;
i2c_dev->dev = &pdev->dev;
- i2c_dev->bus_clk_rate = pdata ? pdata->bus_clk_rate : 100000;
+
+ i2c_dev->bus_clk_rate = 100000; /* default clock rate */
+ if (pdata) {
+ i2c_dev->bus_clk_rate = pdata->bus_clk_rate;
+
+ } else if (i2c_dev->dev->of_node) { /* if there is a device tree node ... */
+ prop = of_get_property(i2c_dev->dev->of_node,
+ "clock-frequency", NULL);
+ if (prop)
+ i2c_dev->bus_clk_rate = be32_to_cpup(prop);
+ }
if (pdev->id == 3)
i2c_dev->is_dvc = 1;
@@ -627,6 +639,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->adapter.algo = &tegra_i2c_algo;
i2c_dev->adapter.dev.parent = &pdev->dev;
i2c_dev->adapter.nr = pdev->id;
+ i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
if (ret) {
@@ -634,6 +647,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
goto err_free_irq;
}
+ of_i2c_register_devices(&i2c_dev->adapter);
+
return 0;
err_free_irq:
free_irq(i2c_dev->irq, i2c_dev);
On Wed, Jun 22, 2011 at 10:16 AM, John Bonesio <[email protected]> wrote:
> This patch modifies the tegra i2c driver so that it can be initiailized
> using the device tree along with the devices connected to the i2c bus.
>
> Signed-off-by: John Bonesio <[email protected]>
> Acked-by: Grant Likely <[email protected]>
> Acked-by: OIof Johansson <[email protected]>
I just noticed something. This patch is incomplete because it does
not have the of_match_table addition (that bit showed up in the 'fill
in' patch that you sent me privately.) Please respin and include the
of_match_table hunk.
Thanks,
g.
> ---
>
> ?drivers/i2c/busses/i2c-tegra.c | ? 17 ++++++++++++++++-
> ?1 files changed, 16 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 4d93196..d2393e6 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -26,6 +26,7 @@
> ?#include <linux/delay.h>
> ?#include <linux/slab.h>
> ?#include <linux/i2c-tegra.h>
> +#include <linux/of_i2c.h>
>
> ?#include <asm/unaligned.h>
>
> @@ -540,6 +541,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
> ? ? ? ?struct resource *iomem;
> ? ? ? ?struct clk *clk;
> ? ? ? ?struct clk *i2c_clk;
> + ? ? ? const unsigned int *prop;
> ? ? ? ?void *base;
> ? ? ? ?int irq;
> ? ? ? ?int ret = 0;
> @@ -597,7 +599,17 @@ static int tegra_i2c_probe(struct platform_device *pdev)
> ? ? ? ?i2c_dev->irq = irq;
> ? ? ? ?i2c_dev->cont_id = pdev->id;
> ? ? ? ?i2c_dev->dev = &pdev->dev;
> - ? ? ? i2c_dev->bus_clk_rate = pdata ? pdata->bus_clk_rate : 100000;
> +
> + ? ? ? i2c_dev->bus_clk_rate = 100000; /* default clock rate */
> + ? ? ? if (pdata) {
> + ? ? ? ? ? ? ? i2c_dev->bus_clk_rate = pdata->bus_clk_rate;
> +
> + ? ? ? } else if (i2c_dev->dev->of_node) { ? ?/* if there is a device tree node ... */
> + ? ? ? ? ? ? ? prop = of_get_property(i2c_dev->dev->of_node,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "clock-frequency", NULL);
> + ? ? ? ? ? ? ? if (prop)
> + ? ? ? ? ? ? ? ? ? ? ? i2c_dev->bus_clk_rate = be32_to_cpup(prop);
> + ? ? ? }
>
> ? ? ? ?if (pdev->id == 3)
> ? ? ? ? ? ? ? ?i2c_dev->is_dvc = 1;
> @@ -627,6 +639,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
> ? ? ? ?i2c_dev->adapter.algo = &tegra_i2c_algo;
> ? ? ? ?i2c_dev->adapter.dev.parent = &pdev->dev;
> ? ? ? ?i2c_dev->adapter.nr = pdev->id;
> + ? ? ? i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
>
> ? ? ? ?ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
> ? ? ? ?if (ret) {
> @@ -634,6 +647,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
> ? ? ? ? ? ? ? ?goto err_free_irq;
> ? ? ? ?}
>
> + ? ? ? of_i2c_register_devices(&i2c_dev->adapter);
> +
> ? ? ? ?return 0;
> ?err_free_irq:
> ? ? ? ?free_irq(i2c_dev->irq, i2c_dev);
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.