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Sat, 06 Sep 2025 11:33:58 -0700 (PDT) Received: from [192.168.50.4] ([82.78.167.139]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e411219ddfsm6301439f8f.57.2025.09.06.11.33.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 06 Sep 2025 11:33:58 -0700 (PDT) Message-ID: <05e16211-7521-452d-9ef3-988dfe70618e@tuxon.dev> Date: Sat, 6 Sep 2025 21:33:56 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 03/32] clk: at91: sam9x75: switch to parent_hw and parent_data To: Ryan.Wanner@microchip.com, mturquette@baylibre.com, sboyd@kernel.org, nicolas.ferre@microchip.com, alexandre.belloni@bootlin.com Cc: varshini.rajendran@microchip.com, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, robh@kernel.org References: From: Claudiu Beznea Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250906_113400_090762_0A8F1EAC X-CRM114-Status: GOOD ( 25.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Ryan, On 7/10/25 23:06, Ryan.Wanner@microchip.com wrote: > From: Ryan Wanner > > Switch SAM9X75 clocks to use parent_hw and parent_data. Having > parent_hw instead of parent names improves to clock registration > speed and re-parenting. > > The USBCLK will be updated in subsequent patches that update the clock > registration functions to use parent_hw and parent_data. > > Signed-off-by: Ryan Wanner > --- > drivers/clk/at91/sam9x7.c | 308 +++++++++++++++++++++----------------- > 1 file changed, 173 insertions(+), 135 deletions(-) > > diff --git a/drivers/clk/at91/sam9x7.c b/drivers/clk/at91/sam9x7.c > index cbb8b220f16b..31184e11165a 100644 > --- a/drivers/clk/at91/sam9x7.c > +++ b/drivers/clk/at91/sam9x7.c > @@ -33,10 +33,22 @@ enum pll_ids { > PLL_ID_UPLL, > PLL_ID_AUDIO, > PLL_ID_LVDS, > - PLL_ID_PLLA_DIV2, > PLL_ID_MAX, > }; > > +/* > + * PLL component identifier > + * @PLL_COMPID_FRAC: Fractional PLL component identifier > + * @PLL_COMPID_DIV0: 1st PLL divider component identifier > + * @PLL_COMPID_DIV1: 2nd PLL divider component identifier > + */ > +enum pll_component_id { > + PLL_COMPID_FRAC, > + PLL_COMPID_DIV0, > + PLL_COMPID_DIV1, > + PLL_COMPID_MAX, > +}; > + > /** > * enum pll_type - PLL type identifiers > * @PLL_TYPE_FRAC: fractional PLL identifier > @@ -180,6 +192,18 @@ static const struct clk_pll_layout pll_divio_layout = { > .endiv_shift = 30, > }; > > +/* > + * SAM9X7 PLL possible parents > + * @SAM9X7_PLL_PARENT_MAINCK: MAINCK is PLL a parent > + * @SAM9X7_PLL_PARENT_MAIN_XTAL: MAIN XTAL is a PLL parent > + * @SAM9X7_PLL_PARENT_FRACCK: Frac PLL is a PLL parent (for PLL dividers) > + */ > +enum sam9x7_pll_parent { > + SAM9X7_PLL_PARENT_MAINCK, > + SAM9X7_PLL_PARENT_MAIN_XTAL, > + SAM9X7_PLL_PARENT_FRACCK > +}; > + > /* > * PLL clocks description > * @n: clock name > @@ -187,22 +211,24 @@ static const struct clk_pll_layout pll_divio_layout = { > * @l: clock layout > * @t: clock type > * @c: pll characteristics > + * @hw: pointer to clk_hw > * @f: clock flags > * @eid: export index in sam9x7->chws[] array > */ > -static const struct { > +static struct { > const char *n; > - const char *p; > const struct clk_pll_layout *l; > u8 t; > const struct clk_pll_characteristics *c; > + struct clk_hw *hw; > unsigned long f; > + enum sam9x7_pll_parent p; > u8 eid; > -} sam9x7_plls[][3] = { > +} sam9x7_plls[][PLL_COMPID_MAX] = { > [PLL_ID_PLLA] = { > - { > + [PLL_COMPID_FRAC] = { > .n = "plla_fracck", > - .p = "mainck", > + .p = SAM9X7_PLL_PARENT_MAINCK, > .l = &plla_frac_layout, > .t = PLL_TYPE_FRAC, > /* > @@ -213,9 +239,9 @@ static const struct { > .c = &plla_characteristics, > }, > > - { > + [PLL_COMPID_DIV0] = { > .n = "plla_divpmcck", > - .p = "plla_fracck", > + .p = SAM9X7_PLL_PARENT_FRACCK, > .l = &pll_divpmc_layout, > .t = PLL_TYPE_DIV, > /* This feeds CPU. It should not be disabled */ > @@ -223,21 +249,35 @@ static const struct { > .eid = PMC_PLLACK, > .c = &plla_characteristics, > }, > + > + [PLL_COMPID_DIV1] = { > + .n = "plla_div2pmcck", > + .p = SAM9X7_PLL_PARENT_FRACCK, > + .l = &plladiv2_divpmc_layout, > + /* > + * This may feed critical parts of the system like timers. > + * It should not be disabled. > + */ > + .f = CLK_IS_CRITICAL | CLK_SET_RATE_GATE, > + .c = &plladiv2_characteristics, > + .eid = PMC_PLLADIV2, > + .t = PLL_TYPE_DIV, > + }, According to manual at [1] this looks correct. Maybe mention this move in commit description. [1] https://ww1.microchip.com/downloads/aemDocuments/documents/MPU32/ProductDocuments/DataSheets/SAM9X7-Series-Data-Sheet-DS60001813.pdf [...] > static void __init sam9x7_pmc_setup(struct device_node *np) > { > struct clk_range range = CLK_RANGE(0, 0); > - const char *td_slck_name, *md_slck_name, *mainxtal_name; > + const char *main_xtal_name = "main_xtal"; > struct pmc_data *sam9x7_pmc; > const char *parent_names[9]; > void **clk_mux_buffer = NULL; > int clk_mux_buffer_size = 0; > - struct clk_hw *main_osc_hw; > struct regmap *regmap; > - struct clk_hw *hw; > + struct clk_hw *hw, *main_rc_hw, *main_osc_hw, *main_xtal_hw; > + struct clk_hw *td_slck_hw, *md_slck_hw, *usbck_hw; > + static struct clk_parent_data parent_data; > + struct clk_hw *parent_hws[9]; > int i, j; > > - i = of_property_match_string(np, "clock-names", "td_slck"); > - if (i < 0) > - return; > - > - td_slck_name = of_clk_get_parent_name(np, i); > - > - i = of_property_match_string(np, "clock-names", "md_slck"); > - if (i < 0) > - return; > - > - md_slck_name = of_clk_get_parent_name(np, i); > + td_slck_hw = __clk_get_hw(of_clk_get_by_name(np, "td_slck")); > + md_slck_hw = __clk_get_hw(of_clk_get_by_name(np, "md_slck")); > + main_xtal_hw = __clk_get_hw(of_clk_get_by_name(np, main_xtal_name)); > > - i = of_property_match_string(np, "clock-names", "main_xtal"); > - if (i < 0) > + if (!td_slck_hw || !md_slck_hw || !main_xtal_hw) > return; > - mainxtal_name = of_clk_get_parent_name(np, i); > > regmap = device_node_to_regmap(np); > if (IS_ERR(regmap)) > @@ -754,26 +774,27 @@ static void __init sam9x7_pmc_setup(struct device_node *np) > if (!clk_mux_buffer) > goto err_free; > > - hw = at91_clk_register_main_rc_osc(regmap, "main_rc_osc", 12000000, > - 50000000); > - if (IS_ERR(hw)) > + main_rc_hw = at91_clk_register_main_rc_osc(regmap, "main_rc_osc", 12000000, > + 50000000); > + if (IS_ERR(main_rc_hw)) > goto err_free; > > - hw = at91_clk_register_main_osc(regmap, "main_osc", mainxtal_name, NULL, 0); > - if (IS_ERR(hw)) > + parent_data.name = main_xtal_name; > + parent_data.fw_name = main_xtal_name; You should be able to use AT91_CLK_PD_NAME() directly in the above call where main_xtal_name should be retrieved with of_clk_get_parent_name()