| Message ID | 20170401125519.7339-2-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On Sat, 2017-04-01 at 14:55 +0200, Martin Blumenstingl wrote: > It seems that the "cpu_clk" was carried over from the meson8b clock > controller driver. On Meson GX (GXBB/GXL/GXM) the registers which are > used by the cpu_clk have a different purpose (in other words: they don't > control the CPU clock anymore). HHI_SYS_CPU_CLK_CNTL1 bits 31:24 are > reserved according to the public S905 datasheet, while bit 23 is the > "A53_trace_clk_DIS" gate (which according to the datasheet should only > be used in case a silicon bug is discovered) and bits 22:20 are a > divider (A53_trace_clk). The meson clk-cpu code however expects that > bits 28:20 are reserved for a divider (according to the public S805 > datasheet this "SCALE_DIV: This value represents an N+1 divider of the > input clock."). > > The CPU clock on Meson GX SoCs is provided by the SCPI DVFS clock > driver instead. Two examples from a Meson GXL S905X SoC: > - vcpu (SCPI DVFS clock 0) rate: 1000000000 / cpu_clk rate: 708000000 > - vcpu (SCPI DVFS clock 0) rate: 1512000000 / cpu_clk rate: 708000000 > > Unfortunately the CLKID_CPUCLK was already exported (but is currently > not used) to DT. Due to the removal of this clock definition there is > now a hole in the clk_hw_onecell_data (which is not a problem because > this case is already handled in gxbb_clkc_probe). > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Looks good to me. I'll wait for the Ack of one of the DT maintainers to apply it. Thx Martin Cheers > --- > drivers/clk/meson/gxbb.c | 64 ++------------------------------ > --- > drivers/clk/meson/gxbb.h | 2 +- > include/dt-bindings/clock/gxbb-clkc.h | 1 - > 3 files changed, 4 insertions(+), 63 deletions(-) > > diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c > index ad5f027af1a2..7cf88ca9bdce 100644 > --- a/drivers/clk/meson/gxbb.c > +++ b/drivers/clk/meson/gxbb.c > @@ -278,20 +278,6 @@ static const struct pll_rate_table > gxl_gp0_pll_rate_table[] = { > { /* sentinel */ }, > }; > > -static const struct clk_div_table cpu_div_table[] = { > - { .val = 1, .div = 1 }, > - { .val = 2, .div = 2 }, > - { .val = 3, .div = 3 }, > - { .val = 2, .div = 4 }, > - { .val = 3, .div = 6 }, > - { .val = 4, .div = 8 }, > - { .val = 5, .div = 10 }, > - { .val = 6, .div = 12 }, > - { .val = 7, .div = 14 }, > - { .val = 8, .div = 16 }, > - { /* sentinel */ }, > -}; > - > static struct meson_clk_pll gxbb_fixed_pll = { > .m = { > .reg_off = HHI_MPLL_CNTL, > @@ -612,21 +598,10 @@ static struct meson_clk_mpll gxbb_mpll2 = { > }; > > /* > - * FIXME cpu clocks and the legacy composite clocks (e.g. clk81) are both PLL > - * post-dividers and should be modeled with their respective PLLs via the > - * forthcoming coordinated clock rates feature > + * FIXME The legacy composite clocks (e.g. clk81) are both PLL post-dividers > + * and should be modeled with their respective PLLs via the forthcoming > + * coordinated clock rates feature > */ > -static struct meson_clk_cpu gxbb_cpu_clk = { > - .reg_off = HHI_SYS_CPU_CLK_CNTL1, > - .div_table = cpu_div_table, > - .clk_nb.notifier_call = meson_clk_cpu_notifier_cb, > - .hw.init = &(struct clk_init_data){ > - .name = "cpu_clk", > - .ops = &meson_clk_cpu_ops, > - .parent_names = (const char *[]){ "sys_pll" }, > - .num_parents = 1, > - }, > -}; > > static u32 mux_table_clk81[] = { 6, 5, 7 }; > > @@ -1045,7 +1020,6 @@ static MESON_GATE(gxbb_ao_i2c, HHI_GCLK_AO, 4); > static struct clk_hw_onecell_data gxbb_hw_onecell_data = { > .hws = { > [CLKID_SYS_PLL] = &gxbb_sys_pll.hw, > - [CLKID_CPUCLK] = &gxbb_cpu_clk.hw, > [CLKID_HDMI_PLL] = &gxbb_hdmi_pll.hw, > [CLKID_FIXED_PLL] = &gxbb_fixed_pll.hw, > [CLKID_FCLK_DIV2] = &gxbb_fclk_div2.hw, > @@ -1165,7 +1139,6 @@ static struct clk_hw_onecell_data gxbb_hw_onecell_data = > { > static struct clk_hw_onecell_data gxl_hw_onecell_data = { > .hws = { > [CLKID_SYS_PLL] = &gxbb_sys_pll.hw, > - [CLKID_CPUCLK] = &gxbb_cpu_clk.hw, > [CLKID_HDMI_PLL] = &gxbb_hdmi_pll.hw, > [CLKID_FIXED_PLL] = &gxbb_fixed_pll.hw, > [CLKID_FCLK_DIV2] = &gxbb_fclk_div2.hw, > @@ -1430,7 +1403,6 @@ struct clkc_data { > unsigned int clk_dividers_count; > struct meson_clk_audio_divider *const *clk_audio_dividers; > unsigned int clk_audio_dividers_count; > - struct meson_clk_cpu *cpu_clk; > struct clk_hw_onecell_data *hw_onecell_data; > }; > > @@ -1447,7 +1419,6 @@ static const struct clkc_data gxbb_clkc_data = { > .clk_dividers_count = ARRAY_SIZE(gxbb_clk_dividers), > .clk_audio_dividers = gxbb_audio_dividers, > .clk_audio_dividers_count = ARRAY_SIZE(gxbb_audio_dividers), > - .cpu_clk = &gxbb_cpu_clk, > .hw_onecell_data = &gxbb_hw_onecell_data, > }; > > @@ -1464,7 +1435,6 @@ static const struct clkc_data gxl_clkc_data = { > .clk_dividers_count = ARRAY_SIZE(gxbb_clk_dividers), > .clk_audio_dividers = gxbb_audio_dividers, > .clk_audio_dividers_count = ARRAY_SIZE(gxbb_audio_dividers), > - .cpu_clk = &gxbb_cpu_clk, > .hw_onecell_data = &gxl_hw_onecell_data, > }; > > @@ -1479,8 +1449,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev) > const struct clkc_data *clkc_data; > void __iomem *clk_base; > int ret, clkid, i; > - struct clk_hw *parent_hw; > - struct clk *parent_clk; > struct device *dev = &pdev->dev; > > clkc_data = of_device_get_match_data(&pdev->dev); > @@ -1502,9 +1470,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev) > for (i = 0; i < clkc_data->clk_mplls_count; i++) > clkc_data->clk_mplls[i]->base = clk_base; > > - /* Populate the base address for CPU clk */ > - clkc_data->cpu_clk->base = clk_base; > - > /* Populate base address for gates */ > for (i = 0; i < clkc_data->clk_gates_count; i++) > clkc_data->clk_gates[i]->reg = clk_base + > @@ -1538,29 +1503,6 @@ static int gxbb_clkc_probe(struct platform_device > *pdev) > goto iounmap; > } > > - /* > - * Register CPU clk notifier > - * > - * FIXME this is wrong for a lot of reasons. First, the muxes should > be > - * struct clk_hw objects. Second, we shouldn't program the muxes in > - * notifier handlers. The tricky programming sequence will be handled > - * by the forthcoming coordinated clock rates mechanism once that > - * feature is released. > - * > - * Furthermore, looking up the parent this way is terrible. At some > - * point we will stop allocating a default struct clk when > registering > - * a new clk_hw, and this hack will no longer work. Releasing the ccr > - * feature before that time solves the problem :-) > - */ > - parent_hw = clk_hw_get_parent(&clkc_data->cpu_clk->hw); > - parent_clk = parent_hw->clk; > - ret = clk_notifier_register(parent_clk, &clkc_data->cpu_clk->clk_nb); > - if (ret) { > - pr_err("%s: failed to register clock notifier for cpu_clk\n", > - __func__); > - goto iounmap; > - } > - > return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get, > clkc_data->hw_onecell_data); > > diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h > index 17c6aef033ff..36330c2d4433 100644 > --- a/drivers/clk/meson/gxbb.h > +++ b/drivers/clk/meson/gxbb.h > @@ -171,7 +171,7 @@ > * to be exposed to client nodes in DT: include/dt-bindings/clock/gxbb-clkc.h > */ > #define CLKID_SYS_PLL 0 > -/* CLKID_CPUCLK */ > +/* ID 1 is unused (it was used by the non-existing CLKID_CPUCLK before) */ > /* CLKID_HDMI_PLL */ > #define CLKID_FIXED_PLL 3 > /* CLKID_FCLK_DIV2 */ > diff --git a/include/dt-bindings/clock/gxbb-clkc.h b/include/dt- > bindings/clock/gxbb-clkc.h > index 4516bc4253b5..54faf83a4851 100644 > --- a/include/dt-bindings/clock/gxbb-clkc.h > +++ b/include/dt-bindings/clock/gxbb-clkc.h > @@ -5,7 +5,6 @@ > #ifndef __GXBB_CLKC_H > #define __GXBB_CLKC_H > > -#define CLKID_CPUCLK 1 > #define CLKID_HDMI_PLL 2 > #define CLKID_FCLK_DIV2 4 > #define CLKID_FCLK_DIV3 5 -- To unsubscribe from this list: send the line "unsubscribe linux-clk" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c index ad5f027af1a2..7cf88ca9bdce 100644 --- a/drivers/clk/meson/gxbb.c +++ b/drivers/clk/meson/gxbb.c @@ -278,20 +278,6 @@ static const struct pll_rate_table gxl_gp0_pll_rate_table[] = { { /* sentinel */ }, }; -static const struct clk_div_table cpu_div_table[] = { - { .val = 1, .div = 1 }, - { .val = 2, .div = 2 }, - { .val = 3, .div = 3 }, - { .val = 2, .div = 4 }, - { .val = 3, .div = 6 }, - { .val = 4, .div = 8 }, - { .val = 5, .div = 10 }, - { .val = 6, .div = 12 }, - { .val = 7, .div = 14 }, - { .val = 8, .div = 16 }, - { /* sentinel */ }, -}; - static struct meson_clk_pll gxbb_fixed_pll = { .m = { .reg_off = HHI_MPLL_CNTL, @@ -612,21 +598,10 @@ static struct meson_clk_mpll gxbb_mpll2 = { }; /* - * FIXME cpu clocks and the legacy composite clocks (e.g. clk81) are both PLL - * post-dividers and should be modeled with their respective PLLs via the - * forthcoming coordinated clock rates feature + * FIXME The legacy composite clocks (e.g. clk81) are both PLL post-dividers + * and should be modeled with their respective PLLs via the forthcoming + * coordinated clock rates feature */ -static struct meson_clk_cpu gxbb_cpu_clk = { - .reg_off = HHI_SYS_CPU_CLK_CNTL1, - .div_table = cpu_div_table, - .clk_nb.notifier_call = meson_clk_cpu_notifier_cb, - .hw.init = &(struct clk_init_data){ - .name = "cpu_clk", - .ops = &meson_clk_cpu_ops, - .parent_names = (const char *[]){ "sys_pll" }, - .num_parents = 1, - }, -}; static u32 mux_table_clk81[] = { 6, 5, 7 }; @@ -1045,7 +1020,6 @@ static MESON_GATE(gxbb_ao_i2c, HHI_GCLK_AO, 4); static struct clk_hw_onecell_data gxbb_hw_onecell_data = { .hws = { [CLKID_SYS_PLL] = &gxbb_sys_pll.hw, - [CLKID_CPUCLK] = &gxbb_cpu_clk.hw, [CLKID_HDMI_PLL] = &gxbb_hdmi_pll.hw, [CLKID_FIXED_PLL] = &gxbb_fixed_pll.hw, [CLKID_FCLK_DIV2] = &gxbb_fclk_div2.hw, @@ -1165,7 +1139,6 @@ static struct clk_hw_onecell_data gxbb_hw_onecell_data = { static struct clk_hw_onecell_data gxl_hw_onecell_data = { .hws = { [CLKID_SYS_PLL] = &gxbb_sys_pll.hw, - [CLKID_CPUCLK] = &gxbb_cpu_clk.hw, [CLKID_HDMI_PLL] = &gxbb_hdmi_pll.hw, [CLKID_FIXED_PLL] = &gxbb_fixed_pll.hw, [CLKID_FCLK_DIV2] = &gxbb_fclk_div2.hw, @@ -1430,7 +1403,6 @@ struct clkc_data { unsigned int clk_dividers_count; struct meson_clk_audio_divider *const *clk_audio_dividers; unsigned int clk_audio_dividers_count; - struct meson_clk_cpu *cpu_clk; struct clk_hw_onecell_data *hw_onecell_data; }; @@ -1447,7 +1419,6 @@ static const struct clkc_data gxbb_clkc_data = { .clk_dividers_count = ARRAY_SIZE(gxbb_clk_dividers), .clk_audio_dividers = gxbb_audio_dividers, .clk_audio_dividers_count = ARRAY_SIZE(gxbb_audio_dividers), - .cpu_clk = &gxbb_cpu_clk, .hw_onecell_data = &gxbb_hw_onecell_data, }; @@ -1464,7 +1435,6 @@ static const struct clkc_data gxl_clkc_data = { .clk_dividers_count = ARRAY_SIZE(gxbb_clk_dividers), .clk_audio_dividers = gxbb_audio_dividers, .clk_audio_dividers_count = ARRAY_SIZE(gxbb_audio_dividers), - .cpu_clk = &gxbb_cpu_clk, .hw_onecell_data = &gxl_hw_onecell_data, }; @@ -1479,8 +1449,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev) const struct clkc_data *clkc_data; void __iomem *clk_base; int ret, clkid, i; - struct clk_hw *parent_hw; - struct clk *parent_clk; struct device *dev = &pdev->dev; clkc_data = of_device_get_match_data(&pdev->dev); @@ -1502,9 +1470,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev) for (i = 0; i < clkc_data->clk_mplls_count; i++) clkc_data->clk_mplls[i]->base = clk_base; - /* Populate the base address for CPU clk */ - clkc_data->cpu_clk->base = clk_base; - /* Populate base address for gates */ for (i = 0; i < clkc_data->clk_gates_count; i++) clkc_data->clk_gates[i]->reg = clk_base + @@ -1538,29 +1503,6 @@ static int gxbb_clkc_probe(struct platform_device *pdev) goto iounmap; } - /* - * Register CPU clk notifier - * - * FIXME this is wrong for a lot of reasons. First, the muxes should be - * struct clk_hw objects. Second, we shouldn't program the muxes in - * notifier handlers. The tricky programming sequence will be handled - * by the forthcoming coordinated clock rates mechanism once that - * feature is released. - * - * Furthermore, looking up the parent this way is terrible. At some - * point we will stop allocating a default struct clk when registering - * a new clk_hw, and this hack will no longer work. Releasing the ccr - * feature before that time solves the problem :-) - */ - parent_hw = clk_hw_get_parent(&clkc_data->cpu_clk->hw); - parent_clk = parent_hw->clk; - ret = clk_notifier_register(parent_clk, &clkc_data->cpu_clk->clk_nb); - if (ret) { - pr_err("%s: failed to register clock notifier for cpu_clk\n", - __func__); - goto iounmap; - } - return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get, clkc_data->hw_onecell_data); diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h index 17c6aef033ff..36330c2d4433 100644 --- a/drivers/clk/meson/gxbb.h +++ b/drivers/clk/meson/gxbb.h @@ -171,7 +171,7 @@ * to be exposed to client nodes in DT: include/dt-bindings/clock/gxbb-clkc.h */ #define CLKID_SYS_PLL 0 -/* CLKID_CPUCLK */ +/* ID 1 is unused (it was used by the non-existing CLKID_CPUCLK before) */ /* CLKID_HDMI_PLL */ #define CLKID_FIXED_PLL 3 /* CLKID_FCLK_DIV2 */ diff --git a/include/dt-bindings/clock/gxbb-clkc.h b/include/dt-bindings/clock/gxbb-clkc.h index 4516bc4253b5..54faf83a4851 100644 --- a/include/dt-bindings/clock/gxbb-clkc.h +++ b/include/dt-bindings/clock/gxbb-clkc.h @@ -5,7 +5,6 @@ #ifndef __GXBB_CLKC_H #define __GXBB_CLKC_H -#define CLKID_CPUCLK 1 #define CLKID_HDMI_PLL 2 #define CLKID_FCLK_DIV2 4 #define CLKID_FCLK_DIV3 5
It seems that the "cpu_clk" was carried over from the meson8b clock controller driver. On Meson GX (GXBB/GXL/GXM) the registers which are used by the cpu_clk have a different purpose (in other words: they don't control the CPU clock anymore). HHI_SYS_CPU_CLK_CNTL1 bits 31:24 are reserved according to the public S905 datasheet, while bit 23 is the "A53_trace_clk_DIS" gate (which according to the datasheet should only be used in case a silicon bug is discovered) and bits 22:20 are a divider (A53_trace_clk). The meson clk-cpu code however expects that bits 28:20 are reserved for a divider (according to the public S805 datasheet this "SCALE_DIV: This value represents an N+1 divider of the input clock."). The CPU clock on Meson GX SoCs is provided by the SCPI DVFS clock driver instead. Two examples from a Meson GXL S905X SoC: - vcpu (SCPI DVFS clock 0) rate: 1000000000 / cpu_clk rate: 708000000 - vcpu (SCPI DVFS clock 0) rate: 1512000000 / cpu_clk rate: 708000000 Unfortunately the CLKID_CPUCLK was already exported (but is currently not used) to DT. Due to the removal of this clock definition there is now a hole in the clk_hw_onecell_data (which is not a problem because this case is already handled in gxbb_clkc_probe). Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> --- drivers/clk/meson/gxbb.c | 64 ++--------------------------------- drivers/clk/meson/gxbb.h | 2 +- include/dt-bindings/clock/gxbb-clkc.h | 1 - 3 files changed, 4 insertions(+), 63 deletions(-)