Hi Wolfram,
On Tue, Aug 30, 2016 at 4:54 PM, Wolfram Sang
<wsa+rene...@sang-engineering.com> wrote:
> The current implementation only works if the da9xxx devices are added
> before their drivers are registered. Only then it can apply the fixes to
> both devices. Otherwise, the driver for the first device gets probed
> before the fix for the second device can be applied. This is what
> fails when using the IP core switcher or when having the i2c master
> driver as a module.
Thanks a lot!
That could also happen when irqc is a victim of deferred probing.
> So, we need to disable both da9xxx once we detected one of them. We now
> use i2c_transfer with hardcoded i2c_messages and device addresses, so we
> don't need the da9xxx client devices to be instantiated. Because the
> fixup is used on specific boards only, the addresses are not going to
> change.
>
> Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+rene...@glider.be>
Tested-by: Geert Uytterhoeven <geert+rene...@glider.be> (r8a7791/koelsch)
> --- a/arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c
> +++ b/arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c
> @@ -41,39 +41,25 @@
>
> #define REGULATOR_IRQ_MASK BIT(2) /* IRQ2, active low */
>
> -static void __iomem *irqc;
> -
> -static const u8 da9063_mask_regs[] = {
> - DA9063_REG_IRQ_MASK_A,
> - DA9063_REG_IRQ_MASK_B,
> - DA9063_REG_IRQ_MASK_C,
> - DA9063_REG_IRQ_MASK_D,
> -};
At first I was puzzled by the removal of all the _B, _C, and _C registers...
> -
> -/* DA9210 System Control and Event Registers */
> +/* start of DA9210 System Control and Event Registers */
> #define DA9210_REG_MASK_A 0x54
> -#define DA9210_REG_MASK_B 0x55
> -
> -static const u8 da9210_mask_regs[] = {
> - DA9210_REG_MASK_A,
> - DA9210_REG_MASK_B,
> -};
> +static u8 da9063_irq_clr[] = { DA9063_REG_IRQ_MASK_A, 0xff, 0xff, 0xff, 0xff
> };
> +static u8 da9210_irq_clr[] = { DA9210_REG_MASK_A, 0xff, 0xff };
... so you may want to add a comment that _A 'till _D resp. _A and _B are
cleared.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
