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Date: Mon, 4 Feb 2013 11:43:28 +0530
From: Prashant Gaikwad <pgaikwad@...dia.com>
To: Peter De Schrijver <pdeschrijver@...dia.com>
CC: Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>,
Stephen Warren <swarren@...dotorg.org>,
Russell King <linux@....linux.org.uk>,
Simon Glass <sjg@...omium.org>,
Mike Turquette <mturquette@...aro.org>,
Joseph Lo <josephl@...dia.com>,
"devicetree-discuss@...ts.ozlabs.org"
<devicetree-discuss@...ts.ozlabs.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 02/10] clk: tegra: Add TEGRA_PLL_BYPASS flag
On Friday 01 February 2013 03:48 PM, Peter De Schrijver wrote:
> Not all PLLs in Tegra114 have a bypass bit. Adapt the common code to only use
> this bit when available.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
Looks good to me.
Reviewed-by: Prashant Gaikwad <pgaikwad@...dia.com>
> drivers/clk/tegra/clk-pll.c | 15 ++++++++++-----
> drivers/clk/tegra/clk.h | 8 +++++---
> 2 files changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
> index 912c977..3c3a25e 100644
> --- a/drivers/clk/tegra/clk-pll.c
> +++ b/drivers/clk/tegra/clk-pll.c
> @@ -166,7 +166,8 @@ static void _clk_pll_enable(struct clk_hw *hw)
> clk_pll_enable_lock(pll);
>
> val = pll_readl_base(pll);
> - val &= ~PLL_BASE_BYPASS;
> + if (pll->flags & TEGRA_PLL_BYPASS)
> + val &= ~PLL_BASE_BYPASS;
> val |= PLL_BASE_ENABLE;
> pll_writel_base(val, pll);
>
> @@ -183,7 +184,9 @@ static void _clk_pll_disable(struct clk_hw *hw)
> u32 val;
>
> val = pll_readl_base(pll);
> - val &= ~(PLL_BASE_BYPASS | PLL_BASE_ENABLE);
> + if (pll->flags & TEGRA_PLL_BYPASS)
> + val &= ~PLL_BASE_BYPASS;
> + val &= ~PLL_BASE_ENABLE;
> pll_writel_base(val, pll);
>
> if (pll->flags & TEGRA_PLLM) {
> @@ -454,7 +457,7 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
>
> val = pll_readl_base(pll);
>
> - if (val & PLL_BASE_BYPASS)
> + if ((pll->flags & TEGRA_PLL_BYPASS) && (val & PLL_BASE_BYPASS))
> return parent_rate;
>
> if ((pll->flags & TEGRA_PLL_FIXED) && !(val & PLL_BASE_OVERRIDE)) {
> @@ -660,9 +663,10 @@ static struct clk *_tegra_clk_register_pll(const char *name,
> struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
> void __iomem *clk_base, void __iomem *pmc,
> unsigned long flags, unsigned long fixed_rate,
> - struct tegra_clk_pll_params *pll_params, u8 pll_flags,
> + struct tegra_clk_pll_params *pll_params, u32 pll_flags,
> struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock)
> {
> + pll_flags |= TEGRA_PLL_BYPASS;
> return _tegra_clk_register_pll(name, parent_name, clk_base, pmc,
> flags, fixed_rate, pll_params, pll_flags, freq_table,
> lock, &tegra_clk_pll_ops);
> @@ -671,9 +675,10 @@ struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
> struct clk *tegra_clk_register_plle(const char *name, const char *parent_name,
> void __iomem *clk_base, void __iomem *pmc,
> unsigned long flags, unsigned long fixed_rate,
> - struct tegra_clk_pll_params *pll_params, u8 pll_flags,
> + struct tegra_clk_pll_params *pll_params, u32 pll_flags,
> struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock)
> {
> + pll_flags |= TEGRA_PLL_BYPASS;
> return _tegra_clk_register_pll(name, parent_name, clk_base, pmc,
> flags, fixed_rate, pll_params, pll_flags, freq_table,
> lock, &tegra_clk_plle_ops);
> diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
> index a09d7dc..3cff1df 100644
> --- a/drivers/clk/tegra/clk.h
> +++ b/drivers/clk/tegra/clk.h
> @@ -182,12 +182,13 @@ struct tegra_clk_pll_params {
> * TEGRA_PLL_FIXED - We are not supposed to change output frequency
> * of some plls.
> * TEGRA_PLLE_CONFIGURE - Configure PLLE when enabling.
> + * TEGRA_PLL_BYPASS - PLL has bypass bit
> */
> struct tegra_clk_pll {
> struct clk_hw hw;
> void __iomem *clk_base;
> void __iomem *pmc;
> - u8 flags;
> + u32 flags;
> unsigned long fixed_rate;
> spinlock_t *lock;
> u8 divn_shift;
> @@ -210,18 +211,19 @@ struct tegra_clk_pll {
> #define TEGRA_PLLM BIT(5)
> #define TEGRA_PLL_FIXED BIT(6)
> #define TEGRA_PLLE_CONFIGURE BIT(7)
> +#define TEGRA_PLL_BYPASS BIT(8)
>
> extern const struct clk_ops tegra_clk_pll_ops;
> extern const struct clk_ops tegra_clk_plle_ops;
> struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
> void __iomem *clk_base, void __iomem *pmc,
> unsigned long flags, unsigned long fixed_rate,
> - struct tegra_clk_pll_params *pll_params, u8 pll_flags,
> + struct tegra_clk_pll_params *pll_params, u32 pll_flags,
> struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock);
> struct clk *tegra_clk_register_plle(const char *name, const char *parent_name,
> void __iomem *clk_base, void __iomem *pmc,
> unsigned long flags, unsigned long fixed_rate,
> - struct tegra_clk_pll_params *pll_params, u8 pll_flags,
> + struct tegra_clk_pll_params *pll_params, u32 pll_flags,
> struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock);
>
> /**
--
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