[PATCH] reset: stm32: Fix bank and offset computation

[Patrick DELAUNAY]

Hi Patrice,

On 4/28/21 1:42 PM, Patrice Chotard wrote:
> BITS_PER_LONG is used to represent register's size which is 32.
> But when compiled on arch64, BITS_PER_LONG is then equal to 64.
>
> Fix bank and offset computation to make it work on arch32 and
> arch64 and ensure that register's size is always equal to 32.
>
> Signed-off-by: Patrice Chotard <patrice.chotard at foss.st.com>
> Signed-off-by: Pankaj Dev <pankaj.dev at st.com>
> ---
>
>   drivers/reset/stm32-reset.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/reset/stm32-reset.c b/drivers/reset/stm32-reset.c
> index daa2e47ebb..bbc6b135a9 100644
> --- a/drivers/reset/stm32-reset.c
> +++ b/drivers/reset/stm32-reset.c
> @@ -40,8 +40,8 @@ static int stm32_reset_free(struct reset_ctl *reset_ctl)
>   static int stm32_reset_assert(struct reset_ctl *reset_ctl)
>   {
>   	struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
> -	int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
> -	int offset = reset_ctl->id % BITS_PER_LONG;
> +	int bank = (reset_ctl->id / (sizeof(u32) * BITS_PER_BYTE)) * 4;
> +	int offset = reset_ctl->id % (sizeof(u32) * BITS_PER_BYTE);
>   
>   	dev_dbg(reset_ctl->dev, "reset id = %ld bank = %d offset = %d)\n",
>   		reset_ctl->id, bank, offset);
> @@ -61,8 +61,8 @@ static int stm32_reset_assert(struct reset_ctl *reset_ctl)
>   static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
>   {
>   	struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
> -	int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
> -	int offset = reset_ctl->id % BITS_PER_LONG;
> +	int bank = (reset_ctl->id / (sizeof(u32) * BITS_PER_BYTE)) * 4;
> +	int offset = reset_ctl->id % (sizeof(u32) * BITS_PER_BYTE);
>   
>   	dev_dbg(reset_ctl->dev, "reset id = %ld bank = %d offset = %d)\n",
>   		reset_ctl->id, bank, offset);


Reviewed-by: Patrick Delaunay <patrick.delaunay at foss.st.com>

Thanks
Patrick