| Message ID | 1565713248-4906-6-git-send-email-wahrenst@gmx.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ARM: Add minimal Raspberry Pi 4 support | expand |
On 13/08/2019 18:20, Stefan Wahren wrote: > The new BCM2711 supports an additional clock for the emmc2 block. > So add a new compatible and register this clock only for BCM2711. > > Signed-off-by: Stefan Wahren <wahrenst@gmx.net> > Reviewed-by: Matthias Brugger <mbrugger@suse.com> > Acked-by: Eric Anholt <eric@anholt.net> > --- > drivers/clk/bcm/clk-bcm2835.c | 20 +++++++++++++++++++- > 1 file changed, 19 insertions(+), 1 deletion(-) > > diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c > index 21cd952..fdf672a 100644 > --- a/drivers/clk/bcm/clk-bcm2835.c > +++ b/drivers/clk/bcm/clk-bcm2835.c > @@ -114,6 +114,8 @@ > #define CM_AVEODIV 0x1bc > #define CM_EMMCCTL 0x1c0 > #define CM_EMMCDIV 0x1c4 > +#define CM_EMMC2CTL 0x1d0 > +#define CM_EMMC2DIV 0x1d4 > > /* General bits for the CM_*CTL regs */ > # define CM_ENABLE BIT(4) > @@ -290,7 +292,8 @@ > #define BCM2835_MAX_FB_RATE 1750000000u > > #define SOC_BCM2835 BIT(0) > -#define SOC_ALL (SOC_BCM2835) > +#define SOC_BCM2711 BIT(1) > +#define SOC_ALL (SOC_BCM2835 | SOC_BCM2711) > > /* > * Names of clocks used within the driver that need to be replaced > @@ -2003,6 +2006,16 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { > .frac_bits = 8, > .tcnt_mux = 39), > > + /* EMMC2 clock (only available for BCM2711) */ > + [BCM2711_CLOCK_EMMC2] = REGISTER_PER_CLK( > + SOC_BCM2711, > + .name = "emmc2", > + .ctl_reg = CM_EMMC2CTL, > + .div_reg = CM_EMMC2DIV, > + .int_bits = 4, > + .frac_bits = 8, > + .tcnt_mux = 42), > + > /* General purpose (GPIO) clocks */ > [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK( > SOC_ALL, > @@ -2238,8 +2251,13 @@ static const struct cprman_plat_data cprman_bcm2835_plat_data = { > .soc = SOC_BCM2835, > }; > > +static const struct cprman_plat_data cprman_bcm2711_plat_data = { > + .soc = SOC_BCM2711, > +}; > + > static const struct of_device_id bcm2835_clk_of_match[] = { > { .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data }, > + { .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data }, Because the RPi4 FW uses bcm2838-cprman as compatible, we will need to add this here as well. Regards, Matthias > {} > }; > MODULE_DEVICE_TABLE(of, bcm2835_clk_of_match); > -- > 2.7.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
Matthias Brugger <matthias.bgg@gmail.com> writes: > On 13/08/2019 18:20, Stefan Wahren wrote: >> The new BCM2711 supports an additional clock for the emmc2 block. >> So add a new compatible and register this clock only for BCM2711. >> >> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> >> Reviewed-by: Matthias Brugger <mbrugger@suse.com> >> Acked-by: Eric Anholt <eric@anholt.net> >> --- >> drivers/clk/bcm/clk-bcm2835.c | 20 +++++++++++++++++++- >> 1 file changed, 19 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c >> index 21cd952..fdf672a 100644 >> --- a/drivers/clk/bcm/clk-bcm2835.c >> +++ b/drivers/clk/bcm/clk-bcm2835.c >> @@ -114,6 +114,8 @@ >> #define CM_AVEODIV 0x1bc >> #define CM_EMMCCTL 0x1c0 >> #define CM_EMMCDIV 0x1c4 >> +#define CM_EMMC2CTL 0x1d0 >> +#define CM_EMMC2DIV 0x1d4 >> >> /* General bits for the CM_*CTL regs */ >> # define CM_ENABLE BIT(4) >> @@ -290,7 +292,8 @@ >> #define BCM2835_MAX_FB_RATE 1750000000u >> >> #define SOC_BCM2835 BIT(0) >> -#define SOC_ALL (SOC_BCM2835) >> +#define SOC_BCM2711 BIT(1) >> +#define SOC_ALL (SOC_BCM2835 | SOC_BCM2711) >> >> /* >> * Names of clocks used within the driver that need to be replaced >> @@ -2003,6 +2006,16 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { >> .frac_bits = 8, >> .tcnt_mux = 39), >> >> + /* EMMC2 clock (only available for BCM2711) */ >> + [BCM2711_CLOCK_EMMC2] = REGISTER_PER_CLK( >> + SOC_BCM2711, >> + .name = "emmc2", >> + .ctl_reg = CM_EMMC2CTL, >> + .div_reg = CM_EMMC2DIV, >> + .int_bits = 4, >> + .frac_bits = 8, >> + .tcnt_mux = 42), >> + >> /* General purpose (GPIO) clocks */ >> [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK( >> SOC_ALL, >> @@ -2238,8 +2251,13 @@ static const struct cprman_plat_data cprman_bcm2835_plat_data = { >> .soc = SOC_BCM2835, >> }; >> >> +static const struct cprman_plat_data cprman_bcm2711_plat_data = { >> + .soc = SOC_BCM2711, >> +}; >> + >> static const struct of_device_id bcm2835_clk_of_match[] = { >> { .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data }, >> + { .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data }, > > Because the RPi4 FW uses bcm2838-cprman as compatible, we will need to add this > here as well. Upstream has not committed to backwards compat with Pi's firmware. That makes the ABI requirement we get held to for upstream's DT absurd, but that's the state of things.
Am 12.09.19 um 20:52 schrieb Eric Anholt: > Matthias Brugger <matthias.bgg@gmail.com> writes: > >> On 13/08/2019 18:20, Stefan Wahren wrote: >>> The new BCM2711 supports an additional clock for the emmc2 block. >>> So add a new compatible and register this clock only for BCM2711. >>> >>> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> >>> Reviewed-by: Matthias Brugger <mbrugger@suse.com> >>> Acked-by: Eric Anholt <eric@anholt.net> >>> --- >>> drivers/clk/bcm/clk-bcm2835.c | 20 +++++++++++++++++++- >>> 1 file changed, 19 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c >>> index 21cd952..fdf672a 100644 >>> --- a/drivers/clk/bcm/clk-bcm2835.c >>> +++ b/drivers/clk/bcm/clk-bcm2835.c >>> @@ -114,6 +114,8 @@ >>> #define CM_AVEODIV 0x1bc >>> #define CM_EMMCCTL 0x1c0 >>> #define CM_EMMCDIV 0x1c4 >>> +#define CM_EMMC2CTL 0x1d0 >>> +#define CM_EMMC2DIV 0x1d4 >>> >>> /* General bits for the CM_*CTL regs */ >>> # define CM_ENABLE BIT(4) >>> @@ -290,7 +292,8 @@ >>> #define BCM2835_MAX_FB_RATE 1750000000u >>> >>> #define SOC_BCM2835 BIT(0) >>> -#define SOC_ALL (SOC_BCM2835) >>> +#define SOC_BCM2711 BIT(1) >>> +#define SOC_ALL (SOC_BCM2835 | SOC_BCM2711) >>> >>> /* >>> * Names of clocks used within the driver that need to be replaced >>> @@ -2003,6 +2006,16 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { >>> .frac_bits = 8, >>> .tcnt_mux = 39), >>> >>> + /* EMMC2 clock (only available for BCM2711) */ >>> + [BCM2711_CLOCK_EMMC2] = REGISTER_PER_CLK( >>> + SOC_BCM2711, >>> + .name = "emmc2", >>> + .ctl_reg = CM_EMMC2CTL, >>> + .div_reg = CM_EMMC2DIV, >>> + .int_bits = 4, >>> + .frac_bits = 8, >>> + .tcnt_mux = 42), >>> + >>> /* General purpose (GPIO) clocks */ >>> [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK( >>> SOC_ALL, >>> @@ -2238,8 +2251,13 @@ static const struct cprman_plat_data cprman_bcm2835_plat_data = { >>> .soc = SOC_BCM2835, >>> }; >>> >>> +static const struct cprman_plat_data cprman_bcm2711_plat_data = { >>> + .soc = SOC_BCM2711, >>> +}; >>> + >>> static const struct of_device_id bcm2835_clk_of_match[] = { >>> { .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data }, >>> + { .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data }, >> Because the RPi4 FW uses bcm2838-cprman as compatible, we will need to add this >> here as well. > Upstream has not committed to backwards compat with Pi's firmware. That > makes the ABI requirement we get held to for upstream's DT absurd, but > that's the state of things. We also learned from past, that's not possible to keep things downstream compatible. As soon as a binding is not accepted, this wont work anymore. A lot of the downstream stuff is hacky. For example yesterday, i learned that the thermal node is broken (register is part of ring oscillator block). So do we really want to be compatible with a hack? I would say: No
On 13/09/2019 03:20, Stefan Wahren wrote: > Am 12.09.19 um 20:52 schrieb Eric Anholt: >> Matthias Brugger <matthias.bgg@gmail.com> writes: >> >>> On 13/08/2019 18:20, Stefan Wahren wrote: >>>> The new BCM2711 supports an additional clock for the emmc2 block. >>>> So add a new compatible and register this clock only for BCM2711. >>>> >>>> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> >>>> Reviewed-by: Matthias Brugger <mbrugger@suse.com> >>>> Acked-by: Eric Anholt <eric@anholt.net> >>>> --- >>>> drivers/clk/bcm/clk-bcm2835.c | 20 +++++++++++++++++++- >>>> 1 file changed, 19 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c >>>> index 21cd952..fdf672a 100644 >>>> --- a/drivers/clk/bcm/clk-bcm2835.c >>>> +++ b/drivers/clk/bcm/clk-bcm2835.c >>>> @@ -114,6 +114,8 @@ >>>> #define CM_AVEODIV 0x1bc >>>> #define CM_EMMCCTL 0x1c0 >>>> #define CM_EMMCDIV 0x1c4 >>>> +#define CM_EMMC2CTL 0x1d0 >>>> +#define CM_EMMC2DIV 0x1d4 >>>> >>>> /* General bits for the CM_*CTL regs */ >>>> # define CM_ENABLE BIT(4) >>>> @@ -290,7 +292,8 @@ >>>> #define BCM2835_MAX_FB_RATE 1750000000u >>>> >>>> #define SOC_BCM2835 BIT(0) >>>> -#define SOC_ALL (SOC_BCM2835) >>>> +#define SOC_BCM2711 BIT(1) >>>> +#define SOC_ALL (SOC_BCM2835 | SOC_BCM2711) >>>> >>>> /* >>>> * Names of clocks used within the driver that need to be replaced >>>> @@ -2003,6 +2006,16 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { >>>> .frac_bits = 8, >>>> .tcnt_mux = 39), >>>> >>>> + /* EMMC2 clock (only available for BCM2711) */ >>>> + [BCM2711_CLOCK_EMMC2] = REGISTER_PER_CLK( >>>> + SOC_BCM2711, >>>> + .name = "emmc2", >>>> + .ctl_reg = CM_EMMC2CTL, >>>> + .div_reg = CM_EMMC2DIV, >>>> + .int_bits = 4, >>>> + .frac_bits = 8, >>>> + .tcnt_mux = 42), >>>> + >>>> /* General purpose (GPIO) clocks */ >>>> [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK( >>>> SOC_ALL, >>>> @@ -2238,8 +2251,13 @@ static const struct cprman_plat_data cprman_bcm2835_plat_data = { >>>> .soc = SOC_BCM2835, >>>> }; >>>> >>>> +static const struct cprman_plat_data cprman_bcm2711_plat_data = { >>>> + .soc = SOC_BCM2711, >>>> +}; >>>> + >>>> static const struct of_device_id bcm2835_clk_of_match[] = { >>>> { .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data }, >>>> + { .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data }, >>> Because the RPi4 FW uses bcm2838-cprman as compatible, we will need to add this >>> here as well. >> Upstream has not committed to backwards compat with Pi's firmware. That >> makes the ABI requirement we get held to for upstream's DT absurd, but >> that's the state of things. > > We also learned from past, that's not possible to keep things downstream > compatible. As soon as a binding is not accepted, this wont work > anymore. A lot of the downstream stuff is hacky. > > For example yesterday, i learned that the thermal node is broken > (register is part of ring oscillator block). So do we really want to be > compatible with a hack? I would say: No > There is always the possibility to fix this in the FW, which in many cases will be trivial.
On 9/13/19 12:13 AM, Matthias Brugger wrote: > > > On 13/09/2019 03:20, Stefan Wahren wrote: >> Am 12.09.19 um 20:52 schrieb Eric Anholt: >>> Matthias Brugger <matthias.bgg@gmail.com> writes: >>> >>>> On 13/08/2019 18:20, Stefan Wahren wrote: >>>>> The new BCM2711 supports an additional clock for the emmc2 block. >>>>> So add a new compatible and register this clock only for BCM2711. >>>>> >>>>> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> >>>>> Reviewed-by: Matthias Brugger <mbrugger@suse.com> >>>>> Acked-by: Eric Anholt <eric@anholt.net> >>>>> --- >>>>> drivers/clk/bcm/clk-bcm2835.c | 20 +++++++++++++++++++- >>>>> 1 file changed, 19 insertions(+), 1 deletion(-) >>>>> >>>>> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c >>>>> index 21cd952..fdf672a 100644 >>>>> --- a/drivers/clk/bcm/clk-bcm2835.c >>>>> +++ b/drivers/clk/bcm/clk-bcm2835.c >>>>> @@ -114,6 +114,8 @@ >>>>> #define CM_AVEODIV 0x1bc >>>>> #define CM_EMMCCTL 0x1c0 >>>>> #define CM_EMMCDIV 0x1c4 >>>>> +#define CM_EMMC2CTL 0x1d0 >>>>> +#define CM_EMMC2DIV 0x1d4 >>>>> >>>>> /* General bits for the CM_*CTL regs */ >>>>> # define CM_ENABLE BIT(4) >>>>> @@ -290,7 +292,8 @@ >>>>> #define BCM2835_MAX_FB_RATE 1750000000u >>>>> >>>>> #define SOC_BCM2835 BIT(0) >>>>> -#define SOC_ALL (SOC_BCM2835) >>>>> +#define SOC_BCM2711 BIT(1) >>>>> +#define SOC_ALL (SOC_BCM2835 | SOC_BCM2711) >>>>> >>>>> /* >>>>> * Names of clocks used within the driver that need to be replaced >>>>> @@ -2003,6 +2006,16 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { >>>>> .frac_bits = 8, >>>>> .tcnt_mux = 39), >>>>> >>>>> + /* EMMC2 clock (only available for BCM2711) */ >>>>> + [BCM2711_CLOCK_EMMC2] = REGISTER_PER_CLK( >>>>> + SOC_BCM2711, >>>>> + .name = "emmc2", >>>>> + .ctl_reg = CM_EMMC2CTL, >>>>> + .div_reg = CM_EMMC2DIV, >>>>> + .int_bits = 4, >>>>> + .frac_bits = 8, >>>>> + .tcnt_mux = 42), >>>>> + >>>>> /* General purpose (GPIO) clocks */ >>>>> [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK( >>>>> SOC_ALL, >>>>> @@ -2238,8 +2251,13 @@ static const struct cprman_plat_data cprman_bcm2835_plat_data = { >>>>> .soc = SOC_BCM2835, >>>>> }; >>>>> >>>>> +static const struct cprman_plat_data cprman_bcm2711_plat_data = { >>>>> + .soc = SOC_BCM2711, >>>>> +}; >>>>> + >>>>> static const struct of_device_id bcm2835_clk_of_match[] = { >>>>> { .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data }, >>>>> + { .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data }, >>>> Because the RPi4 FW uses bcm2838-cprman as compatible, we will need to add this >>>> here as well. >>> Upstream has not committed to backwards compat with Pi's firmware. That >>> makes the ABI requirement we get held to for upstream's DT absurd, but >>> that's the state of things. >> >> We also learned from past, that's not possible to keep things downstream >> compatible. As soon as a binding is not accepted, this wont work >> anymore. A lot of the downstream stuff is hacky. >> >> For example yesterday, i learned that the thermal node is broken >> (register is part of ring oscillator block). So do we really want to be >> compatible with a hack? I would say: No >> > > There is always the possibility to fix this in the FW, which in many cases will > be trivial. In many cases, the firmware can certainly be changed to support both downstream and upstream properties, as long as the layout is not fundamentally incompatible obviously. If this is just a game of compatible strings, both can be provided and it should not cause any issues as long as you are not mixing downstream and upstream drivers for the same purpose.
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index 21cd952..fdf672a 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -114,6 +114,8 @@ #define CM_AVEODIV 0x1bc #define CM_EMMCCTL 0x1c0 #define CM_EMMCDIV 0x1c4 +#define CM_EMMC2CTL 0x1d0 +#define CM_EMMC2DIV 0x1d4 /* General bits for the CM_*CTL regs */ # define CM_ENABLE BIT(4) @@ -290,7 +292,8 @@ #define BCM2835_MAX_FB_RATE 1750000000u #define SOC_BCM2835 BIT(0) -#define SOC_ALL (SOC_BCM2835) +#define SOC_BCM2711 BIT(1) +#define SOC_ALL (SOC_BCM2835 | SOC_BCM2711) /* * Names of clocks used within the driver that need to be replaced @@ -2003,6 +2006,16 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { .frac_bits = 8, .tcnt_mux = 39), + /* EMMC2 clock (only available for BCM2711) */ + [BCM2711_CLOCK_EMMC2] = REGISTER_PER_CLK( + SOC_BCM2711, + .name = "emmc2", + .ctl_reg = CM_EMMC2CTL, + .div_reg = CM_EMMC2DIV, + .int_bits = 4, + .frac_bits = 8, + .tcnt_mux = 42), + /* General purpose (GPIO) clocks */ [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK( SOC_ALL, @@ -2238,8 +2251,13 @@ static const struct cprman_plat_data cprman_bcm2835_plat_data = { .soc = SOC_BCM2835, }; +static const struct cprman_plat_data cprman_bcm2711_plat_data = { + .soc = SOC_BCM2711, +}; + static const struct of_device_id bcm2835_clk_of_match[] = { { .compatible = "brcm,bcm2835-cprman", .data = &cprman_bcm2835_plat_data }, + { .compatible = "brcm,bcm2711-cprman", .data = &cprman_bcm2711_plat_data }, {} }; MODULE_DEVICE_TABLE(of, bcm2835_clk_of_match);