From: Mike Turquette <mturquette@linaro.org> To: "Heiko Stübner" <heiko@sntech.de>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Seungwon Jeon <tgih.jun@samsung.com>, Jaehoon Chung <jh80.chung@samsung.com>, Chris Ball <cjb@laptop.org>, linux-mmc@vger.kernel.org, Grant Likely <grant.likely@linaro.org>, Rob Herring <rob.herring@calxeda.com>, Linus Walleij <linus.walleij@linaro.org>, devicetree-discuss@lists.ozlabs.org, Russell King <linux@arm.linux.org.uk>, Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>, Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Andy Shevchenko <andy.shevchenko@gmail.com> Subject: Re: [PATCH v3 1/7] clk: divider: add flag to limit possible dividers to even numbers Date: Tue, 11 Jun 2013 11:57:50 -0700 [thread overview] Message-ID: <20130611185750.8816.82691@quantum> (raw) In-Reply-To: <201306111329.32749.heiko@sntech.de> Quoting Heiko Stübner (2013-06-11 04:29:32) > SoCs like the Rockchip Cortex-A9 ones contain divider some clocks > that use the regular mechanisms for storage but allow only even > dividers and 1 to be used. > > Therefore add a flag that lets _is_valid_div limit the valid dividers > to these values. _get_maxdiv is also adapted to return even values > for the CLK_DIVIDER_ONE_BASED case. > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > --- > drivers/clk/clk-divider.c | 14 ++++++++++++-- > include/linux/clk-provider.h | 2 ++ > 2 files changed, 14 insertions(+), 2 deletions(-) > > diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c > index ce5cfe9..bdee7cf 100644 > --- a/drivers/clk/clk-divider.c > +++ b/drivers/clk/clk-divider.c > @@ -45,8 +45,16 @@ static unsigned int _get_table_maxdiv(const struct clk_div_table *table) > > static unsigned int _get_maxdiv(struct clk_divider *divider) > { > - if (divider->flags & CLK_DIVIDER_ONE_BASED) > - return div_mask(divider); > + if (divider->flags & CLK_DIVIDER_ONE_BASED) { > + unsigned int div = div_mask(divider); > + > + /* decrease to even number */ > + if (divider->flags & CLK_DIVIDER_EVEN) > + div--; > + > + return div; > + } > + > if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) > return 1 << div_mask(divider); > if (divider->table) > @@ -141,6 +149,8 @@ static bool _is_valid_div(struct clk_divider *divider, unsigned int div) > return is_power_of_2(div); > if (divider->table) > return _is_valid_table_div(divider->table, div); > + if (divider->flags & CLK_DIVIDER_EVEN && div != 1 && (div % 2) != 0) Is it correct to check for 'div != 1' here? Wouldn't that check only be valid in the presence of CLK_DIVIDER_ONE_BASED? Maybe something like this would be more correct: if (divider->flags & CLK_DIVIDER_EVEN && (div % 2) != 0) { if (divider->flags & CLK_DIVIDER_ONE_BASED && div == 1) return true; return false; } Regards, Mike > + return false; > return true; > } > > diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h > index 1ec14a7..bd52e52 100644 > --- a/include/linux/clk-provider.h > +++ b/include/linux/clk-provider.h > @@ -266,6 +266,7 @@ struct clk_div_table { > * of this register, and mask of divider bits are in higher 16-bit of this > * register. While setting the divider bits, higher 16-bit should also be > * updated to indicate changing divider bits. > + * CLK_DIVIDER_EVEN - only allow even divider values > */ > struct clk_divider { > struct clk_hw hw; > @@ -281,6 +282,7 @@ struct clk_divider { > #define CLK_DIVIDER_POWER_OF_TWO BIT(1) > #define CLK_DIVIDER_ALLOW_ZERO BIT(2) > #define CLK_DIVIDER_HIWORD_MASK BIT(3) > +#define CLK_DIVIDER_EVEN BIT(4) > > extern const struct clk_ops clk_divider_ops; > struct clk *clk_register_divider(struct device *dev, const char *name, > -- > 1.7.2.3
WARNING: multiple messages have this Message-ID (diff)
From: mturquette@linaro.org (Mike Turquette) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 1/7] clk: divider: add flag to limit possible dividers to even numbers Date: Tue, 11 Jun 2013 11:57:50 -0700 [thread overview] Message-ID: <20130611185750.8816.82691@quantum> (raw) In-Reply-To: <201306111329.32749.heiko@sntech.de> Quoting Heiko St?bner (2013-06-11 04:29:32) > SoCs like the Rockchip Cortex-A9 ones contain divider some clocks > that use the regular mechanisms for storage but allow only even > dividers and 1 to be used. > > Therefore add a flag that lets _is_valid_div limit the valid dividers > to these values. _get_maxdiv is also adapted to return even values > for the CLK_DIVIDER_ONE_BASED case. > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > --- > drivers/clk/clk-divider.c | 14 ++++++++++++-- > include/linux/clk-provider.h | 2 ++ > 2 files changed, 14 insertions(+), 2 deletions(-) > > diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c > index ce5cfe9..bdee7cf 100644 > --- a/drivers/clk/clk-divider.c > +++ b/drivers/clk/clk-divider.c > @@ -45,8 +45,16 @@ static unsigned int _get_table_maxdiv(const struct clk_div_table *table) > > static unsigned int _get_maxdiv(struct clk_divider *divider) > { > - if (divider->flags & CLK_DIVIDER_ONE_BASED) > - return div_mask(divider); > + if (divider->flags & CLK_DIVIDER_ONE_BASED) { > + unsigned int div = div_mask(divider); > + > + /* decrease to even number */ > + if (divider->flags & CLK_DIVIDER_EVEN) > + div--; > + > + return div; > + } > + > if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) > return 1 << div_mask(divider); > if (divider->table) > @@ -141,6 +149,8 @@ static bool _is_valid_div(struct clk_divider *divider, unsigned int div) > return is_power_of_2(div); > if (divider->table) > return _is_valid_table_div(divider->table, div); > + if (divider->flags & CLK_DIVIDER_EVEN && div != 1 && (div % 2) != 0) Is it correct to check for 'div != 1' here? Wouldn't that check only be valid in the presence of CLK_DIVIDER_ONE_BASED? Maybe something like this would be more correct: if (divider->flags & CLK_DIVIDER_EVEN && (div % 2) != 0) { if (divider->flags & CLK_DIVIDER_ONE_BASED && div == 1) return true; return false; } Regards, Mike > + return false; > return true; > } > > diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h > index 1ec14a7..bd52e52 100644 > --- a/include/linux/clk-provider.h > +++ b/include/linux/clk-provider.h > @@ -266,6 +266,7 @@ struct clk_div_table { > * of this register, and mask of divider bits are in higher 16-bit of this > * register. While setting the divider bits, higher 16-bit should also be > * updated to indicate changing divider bits. > + * CLK_DIVIDER_EVEN - only allow even divider values > */ > struct clk_divider { > struct clk_hw hw; > @@ -281,6 +282,7 @@ struct clk_divider { > #define CLK_DIVIDER_POWER_OF_TWO BIT(1) > #define CLK_DIVIDER_ALLOW_ZERO BIT(2) > #define CLK_DIVIDER_HIWORD_MASK BIT(3) > +#define CLK_DIVIDER_EVEN BIT(4) > > extern const struct clk_ops clk_divider_ops; > struct clk *clk_register_divider(struct device *dev, const char *name, > -- > 1.7.2.3
next prev parent reply other threads:[~2013-06-11 18:57 UTC|newest] Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-06-11 11:28 [PATCH v3 0/7] arm: add basic support for Rockchip Cortex-A9 SoCs Heiko Stübner 2013-06-11 11:28 ` Heiko Stübner 2013-06-11 11:28 ` Heiko Stübner 2013-06-11 11:29 ` [PATCH v3 1/7] clk: divider: add flag to limit possible dividers to even numbers Heiko Stübner 2013-06-11 11:29 ` Heiko Stübner 2013-06-11 11:29 ` Heiko Stübner 2013-06-11 11:51 ` Andy Shevchenko 2013-06-11 11:51 ` Andy Shevchenko 2013-06-11 11:51 ` Andy Shevchenko 2013-06-11 12:06 ` Heiko Stübner 2013-06-11 12:06 ` Heiko Stübner 2013-06-11 12:06 ` Heiko Stübner 2013-06-11 12:37 ` Andy Shevchenko 2013-06-11 12:37 ` Andy Shevchenko 2013-06-11 12:37 ` Andy Shevchenko 2013-06-11 12:39 ` Andy Shevchenko 2013-06-11 12:39 ` Andy Shevchenko 2013-06-11 12:39 ` Andy Shevchenko 2013-06-11 18:57 ` Mike Turquette [this message] 2013-06-11 18:57 ` Mike Turquette 2013-06-11 19:23 ` Heiko Stübner 2013-06-11 19:23 ` Heiko Stübner 2013-06-11 19:23 ` Heiko Stübner 2013-06-11 11:29 ` [PATCH v3 2/7] mmc: dw_mmc-pltfm: remove static from dw_mci_pltfm_remove Heiko Stübner 2013-06-11 11:29 ` Heiko Stübner 2013-06-11 11:29 ` Heiko Stübner 2013-06-11 11:30 ` [PATCH v3 3/7] mmc: dw_mmc-pltfm: move probe and remove below dt match table Heiko Stübner 2013-06-11 11:30 ` Heiko Stübner 2013-06-11 11:30 ` Heiko Stübner 2013-06-12 1:16 ` Seungwon Jeon 2013-06-12 1:16 ` Seungwon Jeon 2013-06-11 11:30 ` [PATCH v3 4/7] mmc: dw_mmc-pltfm: add Rockchip variant Heiko Stübner 2013-06-11 11:30 ` Heiko Stübner 2013-06-11 11:30 ` Heiko Stübner 2013-06-12 1:22 ` Seungwon Jeon 2013-06-12 1:22 ` Seungwon Jeon 2013-06-11 11:31 ` [PATCH v3 5/7] clk: add basic Rockchip rk3066a clock support Heiko Stübner 2013-06-11 11:31 ` Heiko Stübner 2013-06-11 11:31 ` Heiko Stübner 2013-06-11 20:06 ` Mike Turquette 2013-06-11 20:06 ` Mike Turquette 2013-06-12 22:45 ` Heiko Stübner 2013-06-12 22:45 ` Heiko Stübner 2013-06-12 22:45 ` Heiko Stübner 2013-06-12 23:02 ` Olof Johansson 2013-06-12 23:02 ` Olof Johansson 2013-06-12 23:02 ` Olof Johansson 2013-06-12 23:40 ` Heiko Stübner 2013-06-12 23:40 ` Heiko Stübner 2013-06-12 23:40 ` Heiko Stübner 2013-06-11 11:32 ` [PATCH v3 6/7] arm: add debug uarts for rockchip rk29xx and rk3xxx series Heiko Stübner 2013-06-11 11:32 ` Heiko Stübner 2013-06-11 11:32 ` Heiko Stübner 2013-06-11 11:32 ` [PATCH v3 7/7] arm: add basic support for Rockchip RK3066a boards Heiko Stübner 2013-06-11 11:32 ` Heiko Stübner 2013-06-11 11:32 ` Heiko Stübner
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