* [PATCH] i2c: rcar: document HW incapabilities
@ 2017-06-19 21:41 Wolfram Sang
2017-06-23 18:31 ` Wolfram Sang
0 siblings, 1 reply; 2+ messages in thread
From: Wolfram Sang @ 2017-06-19 21:41 UTC (permalink / raw)
To: linux-i2c; +Cc: linux-renesas-soc, Wolfram Sang
Add recent findings (IGNORE_NAK) and document in a bit more detail why
the feature is not possible.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
drivers/i2c/busses/i2c-rcar.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 048deee674955c..93c1a54981df08 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -783,7 +783,12 @@ static int rcar_unreg_slave(struct i2c_client *slave)
static u32 rcar_i2c_func(struct i2c_adapter *adap)
{
- /* This HW can't do SMBUS_QUICK and NOSTART */
+ /*
+ * This HW can't do:
+ * I2C_SMBUS_QUICK (setting FSB during START didn't work)
+ * I2C_M_NOSTART (automatically sends address after START)
+ * I2C_M_IGNORE_NAK (automatically sends STOP after NAK)
+ */
return I2C_FUNC_I2C | I2C_FUNC_SLAVE |
(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
}
--
2.10.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] i2c: rcar: document HW incapabilities
2017-06-19 21:41 [PATCH] i2c: rcar: document HW incapabilities Wolfram Sang
@ 2017-06-23 18:31 ` Wolfram Sang
0 siblings, 0 replies; 2+ messages in thread
From: Wolfram Sang @ 2017-06-23 18:31 UTC (permalink / raw)
To: Wolfram Sang; +Cc: linux-i2c, linux-renesas-soc
[-- Attachment #1: Type: text/plain, Size: 273 bytes --]
On Mon, Jun 19, 2017 at 11:41:46PM +0200, Wolfram Sang wrote:
> Add recent findings (IGNORE_NAK) and document in a bit more detail why
> the feature is not possible.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Applied to for-next, thanks!
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