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[34.79.100.158]) by smtp.gmail.com with ESMTPSA id fl12-20020a05600c0b8c00b004148f9c5822sm2063281wmb.22.2024.03.26.10.28.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Mar 2024 10:28:21 -0700 (PDT) From: Tudor Ambarus To: peter.griffin@linaro.org, krzysztof.kozlowski@linaro.org Cc: alim.akhtar@samsung.com, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, andre.draszik@linaro.org, willmcvicker@google.com, kernel-team@android.com, s.nawrocki@samsung.com, cw00.choi@samsung.com, mturquette@baylibre.com, sboyd@kernel.org, semen.protsenko@linaro.org, linux-clk@vger.kernel.org, jaewon02.kim@samsung.com, Tudor Ambarus Subject: [PATCH v2 3/3] clk: samsung: gs101: propagate PERIC0 USI SPI clock rate Date: Tue, 26 Mar 2024 17:28:13 +0000 Message-ID: <20240326172813.801470-4-tudor.ambarus@linaro.org> X-Mailer: git-send-email 2.44.0.396.g6e790dbe36-goog In-Reply-To: <20240326172813.801470-1-tudor.ambarus@linaro.org> References: <20240326172813.801470-1-tudor.ambarus@linaro.org> Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When SPI transfer is being prepared, the spi-s3c64xx driver will call clk_set_rate() to change the rate of SPI source clock (IPCLK). But IPCLK is a gate (leaf) clock, so it must propagate the rate change up the clock tree, so that corresponding MUX/DIV clocks can actually change their values. Add CLK_SET_RATE_PARENT flag to corresponding clocks for all USI instances in GS101 PERIC0: USI{1-8, 14}. This change involves the following clocks: PERIC0 USI*: Clock Div range MUX Selection ------------------------------------------------------------------- gout_peric0_peric0_top0_ipclk_* - - dout_peric0_usi*_usi /1..16 - mout_peric0_usi*_usi_user - {24.5 MHz, 400 MHz} With input clock of 400 MHz this scheme provides the following IPCLK rate range, for each USI block: PERIC0 USI*: 1.5 MHz ... 400 MHz Accounting for internal /4 divider in SPI blocks, and because the max SPI frequency is limited at 50 MHz, it gives us next SPI SCK rates: PERIC0 USI_SPI*: 384 KHz ... 49.9 MHz Which shall be fine for the applications of the SPI bus. Note that with this we allow the reparenting of the MUX_USIx clocks to OSCCLK. Each instance of the USI IP has its own MUX_USI clock, thus the reparenting of a MUX_USI clock corresponds to a single instance of the USI IP. The datasheet mentions OSCCLK just in the low-power mode context, but the downstream driver reparents too the MUX_USI clocks to OSCCLK. Follow the downstream driver and do the same. Fixes: 893f133a040b ("clk: samsung: gs101: add support for cmu_peric0") Signed-off-by: Tudor Ambarus --- drivers/clk/samsung/clk-gs101.c | 135 +++++++++++++++++--------------- 1 file changed, 72 insertions(+), 63 deletions(-) diff --git a/drivers/clk/samsung/clk-gs101.c b/drivers/clk/samsung/clk-gs101.c index ddf2d57eed68..bd3c1b02715b 100644 --- a/drivers/clk/samsung/clk-gs101.c +++ b/drivers/clk/samsung/clk-gs101.c @@ -2763,33 +2763,33 @@ static const struct samsung_mux_clock peric0_mux_clks[] __initconst = { MUX(CLK_MOUT_PERIC0_USI0_UART_USER, "mout_peric0_usi0_uart_user", mout_peric0_usi0_uart_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI0_UART_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI14_USI_USER, - "mout_peric0_usi14_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI14_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI1_USI_USER, - "mout_peric0_usi1_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI1_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI2_USI_USER, - "mout_peric0_usi2_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI2_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI3_USI_USER, - "mout_peric0_usi3_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI3_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI4_USI_USER, - "mout_peric0_usi4_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI4_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI5_USI_USER, - "mout_peric0_usi5_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI5_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI6_USI_USER, - "mout_peric0_usi6_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI6_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI7_USI_USER, - "mout_peric0_usi7_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI7_USI_USER, 4, 1), - MUX(CLK_MOUT_PERIC0_USI8_USI_USER, - "mout_peric0_usi8_usi_user", mout_peric0_usi_usi_user_p, - PLL_CON0_MUX_CLKCMU_PERIC0_USI8_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI14_USI_USER, + "mout_peric0_usi14_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI14_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI1_USI_USER, + "mout_peric0_usi1_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI1_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI2_USI_USER, + "mout_peric0_usi2_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI2_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI3_USI_USER, + "mout_peric0_usi3_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI3_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI4_USI_USER, + "mout_peric0_usi4_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI4_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI5_USI_USER, + "mout_peric0_usi5_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI5_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI6_USI_USER, + "mout_peric0_usi6_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI6_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI7_USI_USER, + "mout_peric0_usi7_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI7_USI_USER, 4, 1), + nMUX(CLK_MOUT_PERIC0_USI8_USI_USER, + "mout_peric0_usi8_usi_user", mout_peric0_usi_usi_user_p, + PLL_CON0_MUX_CLKCMU_PERIC0_USI8_USI_USER, 4, 1), }; static const struct samsung_div_clock peric0_div_clks[] __initconst = { @@ -2798,33 +2798,42 @@ static const struct samsung_div_clock peric0_div_clks[] __initconst = { DIV(CLK_DOUT_PERIC0_USI0_UART, "dout_peric0_usi0_uart", "mout_peric0_usi0_uart_user", CLK_CON_DIV_DIV_CLK_PERIC0_USI0_UART, 0, 4), - DIV(CLK_DOUT_PERIC0_USI14_USI, - "dout_peric0_usi14_usi", "mout_peric0_usi14_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI14_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI1_USI, - "dout_peric0_usi1_usi", "mout_peric0_usi1_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI1_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI2_USI, - "dout_peric0_usi2_usi", "mout_peric0_usi2_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI2_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI3_USI, - "dout_peric0_usi3_usi", "mout_peric0_usi3_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI3_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI4_USI, - "dout_peric0_usi4_usi", "mout_peric0_usi4_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI4_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI5_USI, - "dout_peric0_usi5_usi", "mout_peric0_usi5_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI5_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI6_USI, - "dout_peric0_usi6_usi", "mout_peric0_usi6_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI6_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI7_USI, - "dout_peric0_usi7_usi", "mout_peric0_usi7_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI7_USI, 0, 4), - DIV(CLK_DOUT_PERIC0_USI8_USI, - "dout_peric0_usi8_usi", "mout_peric0_usi8_usi_user", - CLK_CON_DIV_DIV_CLK_PERIC0_USI8_USI, 0, 4), + DIV_F(CLK_DOUT_PERIC0_USI14_USI, + "dout_peric0_usi14_usi", "mout_peric0_usi14_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI14_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI1_USI, + "dout_peric0_usi1_usi", "mout_peric0_usi1_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI1_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI2_USI, + "dout_peric0_usi2_usi", "mout_peric0_usi2_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI2_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI3_USI, + "dout_peric0_usi3_usi", "mout_peric0_usi3_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI3_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI4_USI, + "dout_peric0_usi4_usi", "mout_peric0_usi4_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI4_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI5_USI, + "dout_peric0_usi5_usi", "mout_peric0_usi5_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI5_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI6_USI, + "dout_peric0_usi6_usi", "mout_peric0_usi6_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI6_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI7_USI, + "dout_peric0_usi7_usi", "mout_peric0_usi7_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI7_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), + DIV_F(CLK_DOUT_PERIC0_USI8_USI, + "dout_peric0_usi8_usi", "mout_peric0_usi8_usi_user", + CLK_CON_DIV_DIV_CLK_PERIC0_USI8_USI, 0, 4, + CLK_SET_RATE_PARENT, 0), }; static const struct samsung_gate_clock peric0_gate_clks[] __initconst = { @@ -2857,11 +2866,11 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = { GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_0, "gout_peric0_peric0_top0_ipclk_0", "dout_peric0_usi1_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_0, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_1, "gout_peric0_peric0_top0_ipclk_1", "dout_peric0_usi2_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_1, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_10, "gout_peric0_peric0_top0_ipclk_10", "dout_peric0_i3c", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_10, @@ -2889,27 +2898,27 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = { GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_2, "gout_peric0_peric0_top0_ipclk_2", "dout_peric0_usi3_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_2, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_3, "gout_peric0_peric0_top0_ipclk_3", "dout_peric0_usi4_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_3, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_4, "gout_peric0_peric0_top0_ipclk_4", "dout_peric0_usi5_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_4, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_5, "gout_peric0_peric0_top0_ipclk_5", "dout_peric0_usi6_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_5, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_6, "gout_peric0_peric0_top0_ipclk_6", "dout_peric0_usi7_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_6, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7, "gout_peric0_peric0_top0_ipclk_7", "dout_peric0_usi8_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_7, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_8, "gout_peric0_peric0_top0_ipclk_8", "dout_peric0_i3c", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_8, @@ -2990,7 +2999,7 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = { GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_2, "gout_peric0_peric0_top1_ipclk_2", "dout_peric0_usi14_usi", CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP1_IPCLKPORT_IPCLK_2, - 21, 0, 0), + 21, CLK_SET_RATE_PARENT, 0), /* Disabling this clock makes the system hang. Mark the clock as critical. */ GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_0, "gout_peric0_peric0_top1_pclk_0", "mout_peric0_bus_user",