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SubjectRe: [PATCH v2 3/5] pinctrl: st: Enhance the controller to manage unavailable registers
Hi Srini,

On 03/07/2014 11:41 AM, srinivas kandagatla wrote:
> Hi Peppe/Maxime,
> I missed a comment... :-)
>
>
> On 07/03/14 09:41, Maxime COQUELIN wrote:
>> From: Giuseppe Cavallaro <peppe.cavallaro@st.com>
>>
>> This patch adds a new logic inside the st pinctrl to manage
>> an unsupported scenario: some sysconfig are not available!
>>
>> This is the case of STiH407 where, although documented, the
>> following registers from SYSCFG_FLASH have been removed from the SoC.
>>
>> SYSTEM_CONFIG3040
>> Output Enable pad control for all PIO Alternate Functions
>> and
>> SYSTEM_ CONFIG3050
>> Pull Up pad control for all PIO Alternate Functions
>>
>> Without managing this condition an imprecise external abort
>> will be detect.
>>
>> To do this the patch also reviews the st_parse_syscfgs
>> and other routines to manipulate the registers only if
>> actually available.
>> In any case, for example the st_parse_syscfgs detected
>> an error condition but no action was made in the
>> st_pctl_probe_dt.
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
>> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
>> ---
>> drivers/pinctrl/pinctrl-st.c | 121 +++++++++++++++++++++++++++----------------
>> 1 file changed, 75 insertions(+), 46 deletions(-)
>>
>> diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
>> index 9e9b6ea..d1886b4 100644
>> --- a/drivers/pinctrl/pinctrl-st.c
>> +++ b/drivers/pinctrl/pinctrl-st.c
>> @@ -390,6 +390,19 @@ static const struct st_pctl_data stih416_data = {
>> .alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100,
>> };
>>
>> +static const struct st_pctl_data stih407_flashdata = {
>> + .rt_style = st_retime_style_none,
>> + .input_delays = stih416_delays,
>> + .ninput_delays = 14,
>> + .output_delays = stih416_delays,
>> + .noutput_delays = 14,
>> + .alt = 0,
>> + .oe = -1, /* Not Available */
>> + .pu = -1, /* Not Available */
>> + .od = 60,
>> + .rt = 100,
>> +};
>> +
>
> I think this stih407_flashdata go with the previous patch "pinctrl: st:
> add pinctrl support for the STiH407 SoC"
>
> So that this patch just adds new checks to pinctrl-driver and not
> stih407 related stuff.

Problem is that "oe" and "pu" takes -1 in that patch, and these values
will be passed directly to devm_regmap_field_alloc without any check.

I propose to apply this patch before "pinctrl: st: add pinctrl support
for the STiH407 SoC", and move stih407_flashdata as you recommend.

Is it fine for you?

Thanks for the review,
Maxime

>
> Other than that the patch looks good to me.
>
>> }
>>
>> /*
>> @@ -1583,7 +1612,7 @@ static struct of_device_id st_pctl_of_match[] = {
>> { .compatible = "st,stih407-sbc-pinctrl", .data = &stih416_data},
>> { .compatible = "st,stih407-front-pinctrl", .data = &stih416_data},
>> { .compatible = "st,stih407-rear-pinctrl", .data = &stih416_data},
>> - { .compatible = "st,stih407-flash-pinctrl", .data = &stih416_data},
>> + { .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata},
> Same as first comment.
>> { /* sentinel */ }
>> };
>>
>>
>
>
> Thanks,
> srini
>


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