The hold field allows to configure the data hold time which can be set
with the help of the generic binding 'i2c-sda-hold-time-ns'. This
feature has been introduced with SAMA5D4 SoC family.
Signed-off-by: Ludovic Desroches <[email protected]>
---
drivers/i2c/busses/i2c-at91.c | 54 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 51 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 10835d1..09e1690 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -64,6 +64,7 @@
#define AT91_TWI_IADR 0x000c /* Internal Address Register */
#define AT91_TWI_CWGR 0x0010 /* Clock Waveform Generator Reg */
+#define AT91_TWI_CWGR_HOLD(x) (((x) & 0x1f) << 24)
#define AT91_TWI_SR 0x0020 /* Status Register */
#define AT91_TWI_TXCOMP BIT(0) /* Transmission Complete */
@@ -110,6 +111,7 @@ struct at91_twi_pdata {
unsigned clk_offset;
bool has_unre_flag;
bool has_alt_cmd;
+ bool has_hold_field;
struct at_dma_slave dma_slave;
};
@@ -187,10 +189,13 @@ static void at91_init_twi_bus(struct at91_twi_dev *dev)
*/
static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk)
{
- int ckdiv, cdiv, div;
+ int ckdiv, cdiv, div, hold = 0;
struct at91_twi_pdata *pdata = dev->pdata;
int offset = pdata->clk_offset;
int max_ckdiv = pdata->clk_max_div;
+ u32 twd_hold_time_ns = 0;
+
+#define MAX_HOLD 31
div = max(0, (int)DIV_ROUND_UP(clk_get_rate(dev->clk),
2 * twi_clk) - offset);
@@ -204,8 +209,33 @@ static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk)
cdiv = 255;
}
- dev->twi_cwgr_reg = (ckdiv << 16) | (cdiv << 8) | cdiv;
- dev_dbg(dev->dev, "cdiv %d ckdiv %d\n", cdiv, ckdiv);
+ if (pdata->has_hold_field) {
+ of_property_read_u32(dev->dev->of_node, "i2c-sda-hold-time-ns",
+ &twd_hold_time_ns);
+
+ /*
+ * hold time = HOLD + 3 x T_peripheral_clock
+ * Use clk rate in kHz to prevent overflows when computing
+ * hold.
+ */
+ hold = DIV_ROUND_UP(twd_hold_time_ns
+ * (clk_get_rate(dev->clk) / 1000), 1000000);
+ hold -= 3;
+ if (hold < 0)
+ hold = 0;
+ if (hold > MAX_HOLD) {
+ dev_warn(dev->dev,
+ "HOLD field set to its maximum value (%d instead of %d)\n",
+ MAX_HOLD, hold);
+ hold = MAX_HOLD;
+ }
+ }
+
+ dev->twi_cwgr_reg = (ckdiv << 16) | (cdiv << 8) | cdiv
+ | AT91_TWI_CWGR_HOLD(hold);
+
+ dev_dbg(dev->dev, "cdiv %d ckdiv %d hold %d (%d ns)\n",
+ cdiv, ckdiv, hold, twd_hold_time_ns);
}
static void at91_twi_dma_cleanup(struct at91_twi_dev *dev)
@@ -797,6 +827,7 @@ static struct at91_twi_pdata at91rm9200_config = {
.clk_offset = 3,
.has_unre_flag = true,
.has_alt_cmd = false,
+ .has_hold_field = false,
};
static struct at91_twi_pdata at91sam9261_config = {
@@ -804,6 +835,7 @@ static struct at91_twi_pdata at91sam9261_config = {
.clk_offset = 4,
.has_unre_flag = false,
.has_alt_cmd = false,
+ .has_hold_field = false,
};
static struct at91_twi_pdata at91sam9260_config = {
@@ -811,6 +843,7 @@ static struct at91_twi_pdata at91sam9260_config = {
.clk_offset = 4,
.has_unre_flag = false,
.has_alt_cmd = false,
+ .has_hold_field = false,
};
static struct at91_twi_pdata at91sam9g20_config = {
@@ -818,6 +851,7 @@ static struct at91_twi_pdata at91sam9g20_config = {
.clk_offset = 4,
.has_unre_flag = false,
.has_alt_cmd = false,
+ .has_hold_field = false,
};
static struct at91_twi_pdata at91sam9g10_config = {
@@ -825,6 +859,7 @@ static struct at91_twi_pdata at91sam9g10_config = {
.clk_offset = 4,
.has_unre_flag = false,
.has_alt_cmd = false,
+ .has_hold_field = false,
};
static const struct platform_device_id at91_twi_devtypes[] = {
@@ -854,6 +889,15 @@ static struct at91_twi_pdata at91sam9x5_config = {
.clk_offset = 4,
.has_unre_flag = false,
.has_alt_cmd = false,
+ .has_hold_field = false,
+};
+
+static struct at91_twi_pdata sama5d4_config = {
+ .clk_max_div = 7,
+ .clk_offset = 4,
+ .has_unre_flag = false,
+ .has_alt_cmd = false,
+ .has_hold_field = true,
};
static struct at91_twi_pdata sama5d2_config = {
@@ -861,6 +905,7 @@ static struct at91_twi_pdata sama5d2_config = {
.clk_offset = 4,
.has_unre_flag = true,
.has_alt_cmd = true,
+ .has_hold_field = true,
};
static const struct of_device_id atmel_twi_dt_ids[] = {
@@ -883,6 +928,9 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
.compatible = "atmel,at91sam9x5-i2c",
.data = &at91sam9x5_config,
}, {
+ .compatible = "atmel,sama5d4-i2c",
+ .data = &sama5d4_config,
+ }, {
.compatible = "atmel,sama5d2-i2c",
.data = &sama5d2_config,
}, {
--
2.5.0
The i2c-sda-hold-time-ns property is supported from atmel,sama5d4-i2c.
Signed-off-by: Ludovic Desroches <[email protected]>
---
Documentation/devicetree/bindings/i2c/i2c-at91.txt | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-at91.txt b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
index 6e81dc1..67c6f2e 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-at91.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
@@ -3,7 +3,7 @@ I2C for Atmel platforms
Required properties :
- compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",
"atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c",
- "atmel,at91sam9x5-i2c" or "atmel,sama5d2-i2c"
+ "atmel,at91sam9x5-i2c", "atmel,sama5d4-i2c" or "atmel,sama5d2-i2c"
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
@@ -17,6 +17,7 @@ Optional properties:
- dma-names: should contain "tx" and "rx".
- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
capable I2C controllers.
+- i2c-sda-hold-time-ns: TWD hold time, only available from "atmel,sama5d4-i2c".
- Child nodes conforming to i2c bus binding
Examples :
@@ -52,6 +53,7 @@ i2c0: i2c@f8034600 {
#size-cells = <0>;
clocks = <&flx0>;
atmel,fifo-size = <16>;
+ i2c-sda-hold-time-ns = <336>;
wm8731: wm8731@1a {
compatible = "wm8731";
--
2.5.0
A new compatible string has been introduced: atmel,sama5d4-i2c. It
allows to use the i2c-sda-hold-time-ns property if needed.
Signed-off-by: Ludovic Desroches <[email protected]>
---
arch/arm/boot/dts/sama5d4.dtsi | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/boot/dts/sama5d4.dtsi b/arch/arm/boot/dts/sama5d4.dtsi
index 2193637..83d7e7c 100644
--- a/arch/arm/boot/dts/sama5d4.dtsi
+++ b/arch/arm/boot/dts/sama5d4.dtsi
@@ -916,7 +916,7 @@
};
i2c0: i2c@f8014000 {
- compatible = "atmel,at91sam9x5-i2c";
+ compatible = "atmel,sama5d4-i2c";
reg = <0xf8014000 0x4000>;
interrupts = <32 IRQ_TYPE_LEVEL_HIGH 6>;
dmas = <&dma1
@@ -935,7 +935,7 @@
};
i2c1: i2c@f8018000 {
- compatible = "atmel,at91sam9x5-i2c";
+ compatible = "atmel,sama5d4-i2c";
reg = <0xf8018000 0x4000>;
interrupts = <33 IRQ_TYPE_LEVEL_HIGH 6>;
dmas = <&dma1
@@ -975,7 +975,7 @@
};
i2c2: i2c@f8024000 {
- compatible = "atmel,at91sam9x5-i2c";
+ compatible = "atmel,sama5d4-i2c";
reg = <0xf8024000 0x4000>;
interrupts = <34 IRQ_TYPE_LEVEL_HIGH 6>;
dmas = <&dma1
--
2.5.0
Data have to been hold longer for the PMIC device.
Signed-off-by: Ludovic Desroches <[email protected]>
---
arch/arm/boot/dts/at91-sama5d2_xplained.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
index ad6de73..9bced00 100644
--- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts
+++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
@@ -129,6 +129,7 @@
dmas = <0>, <0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c0_default>;
+ i2c-sda-hold-time-ns = <350>;
status = "okay";
pmic: act8865@5b {
--
2.5.0
Le 02/12/2015 11:39, Ludovic Desroches a ?crit :
> The hold field allows to configure the data hold time which can be set
> with the help of the generic binding 'i2c-sda-hold-time-ns'. This
> feature has been introduced with SAMA5D4 SoC family.
>
> Signed-off-by: Ludovic Desroches <[email protected]>
> ---
> drivers/i2c/busses/i2c-at91.c | 54 ++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 51 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> index 10835d1..09e1690 100644
> --- a/drivers/i2c/busses/i2c-at91.c
> +++ b/drivers/i2c/busses/i2c-at91.c
> @@ -64,6 +64,7 @@
> #define AT91_TWI_IADR 0x000c /* Internal Address Register */
>
> #define AT91_TWI_CWGR 0x0010 /* Clock Waveform Generator Reg */
> +#define AT91_TWI_CWGR_HOLD(x) (((x) & 0x1f) << 24)
I would have defined MAX_HOLD here and used it in the mask above...
>
> #define AT91_TWI_SR 0x0020 /* Status Register */
> #define AT91_TWI_TXCOMP BIT(0) /* Transmission Complete */
> @@ -110,6 +111,7 @@ struct at91_twi_pdata {
> unsigned clk_offset;
> bool has_unre_flag;
> bool has_alt_cmd;
> + bool has_hold_field;
> struct at_dma_slave dma_slave;
> };
>
> @@ -187,10 +189,13 @@ static void at91_init_twi_bus(struct at91_twi_dev *dev)
> */
> static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk)
> {
> - int ckdiv, cdiv, div;
> + int ckdiv, cdiv, div, hold = 0;
> struct at91_twi_pdata *pdata = dev->pdata;
> int offset = pdata->clk_offset;
> int max_ckdiv = pdata->clk_max_div;
> + u32 twd_hold_time_ns = 0;
> +
> +#define MAX_HOLD 31
Instead of here ^^
>
> div = max(0, (int)DIV_ROUND_UP(clk_get_rate(dev->clk),
> 2 * twi_clk) - offset);
> @@ -204,8 +209,33 @@ static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk)
> cdiv = 255;
> }
>
> - dev->twi_cwgr_reg = (ckdiv << 16) | (cdiv << 8) | cdiv;
> - dev_dbg(dev->dev, "cdiv %d ckdiv %d\n", cdiv, ckdiv);
> + if (pdata->has_hold_field) {
> + of_property_read_u32(dev->dev->of_node, "i2c-sda-hold-time-ns",
> + &twd_hold_time_ns);
> +
> + /*
> + * hold time = HOLD + 3 x T_peripheral_clock
> + * Use clk rate in kHz to prevent overflows when computing
> + * hold.
> + */
> + hold = DIV_ROUND_UP(twd_hold_time_ns
> + * (clk_get_rate(dev->clk) / 1000), 1000000);
> + hold -= 3;
> + if (hold < 0)
> + hold = 0;
> + if (hold > MAX_HOLD) {
> + dev_warn(dev->dev,
> + "HOLD field set to its maximum value (%d instead of %d)\n",
> + MAX_HOLD, hold);
> + hold = MAX_HOLD;
> + }
> + }
> +
> + dev->twi_cwgr_reg = (ckdiv << 16) | (cdiv << 8) | cdiv
> + | AT91_TWI_CWGR_HOLD(hold);
> +
> + dev_dbg(dev->dev, "cdiv %d ckdiv %d hold %d (%d ns)\n",
> + cdiv, ckdiv, hold, twd_hold_time_ns);
> }
>
> static void at91_twi_dma_cleanup(struct at91_twi_dev *dev)
> @@ -797,6 +827,7 @@ static struct at91_twi_pdata at91rm9200_config = {
> .clk_offset = 3,
> .has_unre_flag = true,
> .has_alt_cmd = false,
> + .has_hold_field = false,
> };
>
> static struct at91_twi_pdata at91sam9261_config = {
> @@ -804,6 +835,7 @@ static struct at91_twi_pdata at91sam9261_config = {
> .clk_offset = 4,
> .has_unre_flag = false,
> .has_alt_cmd = false,
> + .has_hold_field = false,
> };
>
> static struct at91_twi_pdata at91sam9260_config = {
> @@ -811,6 +843,7 @@ static struct at91_twi_pdata at91sam9260_config = {
> .clk_offset = 4,
> .has_unre_flag = false,
> .has_alt_cmd = false,
> + .has_hold_field = false,
> };
>
> static struct at91_twi_pdata at91sam9g20_config = {
> @@ -818,6 +851,7 @@ static struct at91_twi_pdata at91sam9g20_config = {
> .clk_offset = 4,
> .has_unre_flag = false,
> .has_alt_cmd = false,
> + .has_hold_field = false,
> };
>
> static struct at91_twi_pdata at91sam9g10_config = {
> @@ -825,6 +859,7 @@ static struct at91_twi_pdata at91sam9g10_config = {
> .clk_offset = 4,
> .has_unre_flag = false,
> .has_alt_cmd = false,
> + .has_hold_field = false,
> };
>
> static const struct platform_device_id at91_twi_devtypes[] = {
> @@ -854,6 +889,15 @@ static struct at91_twi_pdata at91sam9x5_config = {
> .clk_offset = 4,
> .has_unre_flag = false,
> .has_alt_cmd = false,
> + .has_hold_field = false,
> +};
> +
> +static struct at91_twi_pdata sama5d4_config = {
> + .clk_max_div = 7,
> + .clk_offset = 4,
> + .has_unre_flag = false,
> + .has_alt_cmd = false,
> + .has_hold_field = true,
> };
>
> static struct at91_twi_pdata sama5d2_config = {
> @@ -861,6 +905,7 @@ static struct at91_twi_pdata sama5d2_config = {
> .clk_offset = 4,
> .has_unre_flag = true,
> .has_alt_cmd = true,
> + .has_hold_field = true,
> };
>
> static const struct of_device_id atmel_twi_dt_ids[] = {
> @@ -883,6 +928,9 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
> .compatible = "atmel,at91sam9x5-i2c",
> .data = &at91sam9x5_config,
> }, {
> + .compatible = "atmel,sama5d4-i2c",
> + .data = &sama5d4_config,
> + }, {
> .compatible = "atmel,sama5d2-i2c",
> .data = &sama5d2_config,
> }, {
Otherwise it's okay for me.
Bye,
--
Nicolas Ferre
Le 02/12/2015 11:39, Ludovic Desroches a ?crit :
> The i2c-sda-hold-time-ns property is supported from atmel,sama5d4-i2c.
>
> Signed-off-by: Ludovic Desroches <[email protected]>
> ---
> Documentation/devicetree/bindings/i2c/i2c-at91.txt | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-at91.txt b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
> index 6e81dc1..67c6f2e 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-at91.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
> @@ -3,7 +3,7 @@ I2C for Atmel platforms
> Required properties :
> - compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",
> "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c",
> - "atmel,at91sam9x5-i2c" or "atmel,sama5d2-i2c"
> + "atmel,at91sam9x5-i2c", "atmel,sama5d4-i2c" or "atmel,sama5d2-i2c"
> - reg: physical base address of the controller and length of memory mapped
> region.
> - interrupts: interrupt number to the cpu.
> @@ -17,6 +17,7 @@ Optional properties:
> - dma-names: should contain "tx" and "rx".
> - atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
> capable I2C controllers.
> +- i2c-sda-hold-time-ns: TWD hold time, only available from "atmel,sama5d4-i2c".
Yep, but you must make it clearer that sama5d2 also has this property
available: people usually don't know that sama5d2 comes after sama5d4
over time...
Bye,
> - Child nodes conforming to i2c bus binding
>
> Examples :
> @@ -52,6 +53,7 @@ i2c0: i2c@f8034600 {
> #size-cells = <0>;
> clocks = <&flx0>;
> atmel,fifo-size = <16>;
> + i2c-sda-hold-time-ns = <336>;
>
> wm8731: wm8731@1a {
> compatible = "wm8731";
>
--
Nicolas Ferre
Le 02/12/2015 11:39, Ludovic Desroches a ?crit :
> A new compatible string has been introduced: atmel,sama5d4-i2c. It
> allows to use the i2c-sda-hold-time-ns property if needed.
>
> Signed-off-by: Ludovic Desroches <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Ok, we'll need to synchronize with Wolfram for the 2 remaining ones of
this series.
> ---
> arch/arm/boot/dts/sama5d4.dtsi | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/boot/dts/sama5d4.dtsi b/arch/arm/boot/dts/sama5d4.dtsi
> index 2193637..83d7e7c 100644
> --- a/arch/arm/boot/dts/sama5d4.dtsi
> +++ b/arch/arm/boot/dts/sama5d4.dtsi
> @@ -916,7 +916,7 @@
> };
>
> i2c0: i2c@f8014000 {
> - compatible = "atmel,at91sam9x5-i2c";
> + compatible = "atmel,sama5d4-i2c";
> reg = <0xf8014000 0x4000>;
> interrupts = <32 IRQ_TYPE_LEVEL_HIGH 6>;
> dmas = <&dma1
> @@ -935,7 +935,7 @@
> };
>
> i2c1: i2c@f8018000 {
> - compatible = "atmel,at91sam9x5-i2c";
> + compatible = "atmel,sama5d4-i2c";
> reg = <0xf8018000 0x4000>;
> interrupts = <33 IRQ_TYPE_LEVEL_HIGH 6>;
> dmas = <&dma1
> @@ -975,7 +975,7 @@
> };
>
> i2c2: i2c@f8024000 {
> - compatible = "atmel,at91sam9x5-i2c";
> + compatible = "atmel,sama5d4-i2c";
> reg = <0xf8024000 0x4000>;
> interrupts = <34 IRQ_TYPE_LEVEL_HIGH 6>;
> dmas = <&dma1
>
--
Nicolas Ferre
Le 02/12/2015 11:39, Ludovic Desroches a ?crit :
> Data have to been hold longer for the PMIC device.
s/been/be/
It can also be interesting to know where the value comes from...
> Signed-off-by: Ludovic Desroches <[email protected]>
> ---
> arch/arm/boot/dts/at91-sama5d2_xplained.dts | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
> index ad6de73..9bced00 100644
> --- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts
> +++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
> @@ -129,6 +129,7 @@
> dmas = <0>, <0>;
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_i2c0_default>;
> + i2c-sda-hold-time-ns = <350>;
> status = "okay";
>
> pmic: act8865@5b {
>
--
Nicolas Ferre
On Wed, Dec 02, 2015 at 11:39:05AM +0100, Ludovic Desroches wrote:
> The i2c-sda-hold-time-ns property is supported from atmel,sama5d4-i2c.
>
> Signed-off-by: Ludovic Desroches <[email protected]>
Acked-by: Rob Herring <[email protected]>
> ---
> Documentation/devicetree/bindings/i2c/i2c-at91.txt | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-at91.txt b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
> index 6e81dc1..67c6f2e 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-at91.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-at91.txt
> @@ -3,7 +3,7 @@ I2C for Atmel platforms
> Required properties :
> - compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",
> "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c",
> - "atmel,at91sam9x5-i2c" or "atmel,sama5d2-i2c"
> + "atmel,at91sam9x5-i2c", "atmel,sama5d4-i2c" or "atmel,sama5d2-i2c"
> - reg: physical base address of the controller and length of memory mapped
> region.
> - interrupts: interrupt number to the cpu.
> @@ -17,6 +17,7 @@ Optional properties:
> - dma-names: should contain "tx" and "rx".
> - atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
> capable I2C controllers.
> +- i2c-sda-hold-time-ns: TWD hold time, only available from "atmel,sama5d4-i2c".
> - Child nodes conforming to i2c bus binding
>
> Examples :
> @@ -52,6 +53,7 @@ i2c0: i2c@f8034600 {
> #size-cells = <0>;
> clocks = <&flx0>;
> atmel,fifo-size = <16>;
> + i2c-sda-hold-time-ns = <336>;
>
> wm8731: wm8731@1a {
> compatible = "wm8731";
> --
> 2.5.0
>
> --
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