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* [PATCH] i2c: i2c-stm32f7: rework slave_id allocation
@ 2019-10-15 13:03 Alain Volmat
  2019-10-22 13:41 ` Pierre Yves MORDRET
  2019-10-24 18:35 ` Wolfram Sang
  0 siblings, 2 replies; 3+ messages in thread
From: Alain Volmat @ 2019-10-15 13:03 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

The IP can handle two slave addresses. One address can either be
7 bits or 10 bits while the other can only be 7 bits.
In order to ensure that a 10 bits address can always be allocated
(assuming there is only one 7 bits address already allocated),
pick up the 7-bits only address slot in priority when performing a 7-bits
address allocation.

Fixes: 60d609f3 ("i2c: i2c-stm32f7: Add slave support")

Signed-off-by: Alain Volmat <alain.volmat@st.com>
---
 drivers/i2c/busses/i2c-stm32f7.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index d36cf08461f7..cfae01b15243 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1265,7 +1265,7 @@ static int stm32f7_i2c_get_free_slave_id(struct stm32f7_i2c_dev *i2c_dev,
 	 * slave[0] supports 7-bit and 10-bit slave address
 	 * slave[1] supports 7-bit slave address only
 	 */
-	for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) {
+	for (i = STM32F7_I2C_MAX_SLAVE - 1; i >= 0; i--) {
 		if (i == 1 && (slave->flags & I2C_CLIENT_PEC))
 			continue;
 		if (!i2c_dev->slave[i]) {
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH] i2c: i2c-stm32f7: rework slave_id allocation
  2019-10-15 13:03 [PATCH] i2c: i2c-stm32f7: rework slave_id allocation Alain Volmat
@ 2019-10-22 13:41 ` Pierre Yves MORDRET
  2019-10-24 18:35 ` Wolfram Sang
  1 sibling, 0 replies; 3+ messages in thread
From: Pierre Yves MORDRET @ 2019-10-22 13:41 UTC (permalink / raw)
  To: Alain Volmat, wsa, robh+dt
  Cc: mark.rutland, mcoquelin.stm32, alexandre.torgue, linux-i2c,
	devicetree, linux-stm32, linux-arm-kernel, linux-kernel,
	fabrice.gasnier

Hello

Looks good

Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>

Thx
Regards

On 10/15/19 3:03 PM, Alain Volmat wrote:
> The IP can handle two slave addresses. One address can either be
> 7 bits or 10 bits while the other can only be 7 bits.
> In order to ensure that a 10 bits address can always be allocated
> (assuming there is only one 7 bits address already allocated),
> pick up the 7-bits only address slot in priority when performing a 7-bits
> address allocation.
> 
> Fixes: 60d609f3 ("i2c: i2c-stm32f7: Add slave support")
> 
> Signed-off-by: Alain Volmat <alain.volmat@st.com>
> ---
>  drivers/i2c/busses/i2c-stm32f7.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> index d36cf08461f7..cfae01b15243 100644
> --- a/drivers/i2c/busses/i2c-stm32f7.c
> +++ b/drivers/i2c/busses/i2c-stm32f7.c
> @@ -1265,7 +1265,7 @@ static int stm32f7_i2c_get_free_slave_id(struct stm32f7_i2c_dev *i2c_dev,
>  	 * slave[0] supports 7-bit and 10-bit slave address
>  	 * slave[1] supports 7-bit slave address only
>  	 */
> -	for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) {
> +	for (i = STM32F7_I2C_MAX_SLAVE - 1; i >= 0; i--) {
>  		if (i == 1 && (slave->flags & I2C_CLIENT_PEC))
>  			continue;
>  		if (!i2c_dev->slave[i]) {
> 

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH] i2c: i2c-stm32f7: rework slave_id allocation
  2019-10-15 13:03 [PATCH] i2c: i2c-stm32f7: rework slave_id allocation Alain Volmat
  2019-10-22 13:41 ` Pierre Yves MORDRET
@ 2019-10-24 18:35 ` Wolfram Sang
  1 sibling, 0 replies; 3+ messages in thread
From: Wolfram Sang @ 2019-10-24 18:35 UTC (permalink / raw)
  To: Alain Volmat
  Cc: robh+dt, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

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On Tue, Oct 15, 2019 at 03:03:09PM +0200, Alain Volmat wrote:
> The IP can handle two slave addresses. One address can either be
> 7 bits or 10 bits while the other can only be 7 bits.
> In order to ensure that a 10 bits address can always be allocated
> (assuming there is only one 7 bits address already allocated),
> pick up the 7-bits only address slot in priority when performing a 7-bits
> address allocation.
> 
> Fixes: 60d609f3 ("i2c: i2c-stm32f7: Add slave support")
> 
> Signed-off-by: Alain Volmat <alain.volmat@st.com>

Applied to for-next, thanks!


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^ permalink raw reply	[flat|nested] 3+ messages in thread

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2019-10-15 13:03 [PATCH] i2c: i2c-stm32f7: rework slave_id allocation Alain Volmat
2019-10-22 13:41 ` Pierre Yves MORDRET
2019-10-24 18:35 ` Wolfram Sang

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