linux-kernel - Re: [PATCH 02/24] pinctrl: samsung: accept GPIO bank nodes with a suffix

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Message-ID: <9c4d825a-1f35-3e47-b91c-499525213343@canonical.com>
Date:   Wed, 5 Jan 2022 21:31:36 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>,
        Chanho Park <chanho61.park@...sung.com>
Subject: Re: [PATCH 02/24] pinctrl: samsung: accept GPIO bank nodes with a
 suffix

On 03/01/2022 19:43, Sam Protsenko wrote:
> On Fri, 31 Dec 2021 at 18:20, Krzysztof Kozlowski
> <krzysztof.kozlowski@...onical.com> wrote:
>>
>> Existing dt-bindings expected that each GPIO/pin bank within pin
>> controller has its own node with name matching the bank (e.g. gpa0,
>> gpx2) and "gpio-controller" property.  The node name is then used for
>> matching between driver data and DTS.
>>
>> Newly introduced dtschema expects to have nodes ending with "-gpio-bank"
>> suffix, so rewrite bank-devicetree matching to look for old and new
>> style of naming.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> ---
>>  drivers/pinctrl/samsung/pinctrl-samsung.c | 57 ++++++++++++++++++-----
>>  1 file changed, 45 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
>> index f2864a7869b3..561853df8ef7 100644
>> --- a/drivers/pinctrl/samsung/pinctrl-samsung.c
>> +++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
>> @@ -1011,13 +1011,56 @@ static void samsung_banks_of_node_put(struct samsung_pinctrl_drv_data *d)
>>                 of_node_put(bank->of_node);
>>  }
>>
>> +/*
>> + * Iterate over all driver pin banks to find one matching the name of node,
>> + * skipping optional "-gpio" node suffix. When found, assign node to the bank.
>> + */
>> +static void samsung_banks_of_node_get(struct device *dev,
>> +                                     struct samsung_pinctrl_drv_data *d,
>> +                                     struct device_node *node)
>> +{
>> +       const char *suffix = "-gpio-bank";
>> +       struct samsung_pin_bank *bank;
>> +       struct device_node *child;
>> +       /* Pin bank names are up to 4 characters */
>> +       char node_name[20];
>> +       unsigned int i;
>> +       size_t len;
>> +
>> +       bank = d->pin_banks;
>> +       for (i = 0; i < d->nr_banks; ++i, ++bank) {
>> +               strscpy(node_name, bank->name, sizeof(node_name));
>> +               len = strlcat(node_name, suffix, sizeof(node_name));
>> +               if (len == sizeof(sizeof(node_name))) {
> 
> Double sizeof is probably wrong?

Thanks, copy-paste error... it should be also "len >= sizeof".


Best regards,
Krzysztof