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Sun, 28 Jun 2026 12:59:54 -0700 (PDT) From: =?utf-8?q?Stefan_D=C3=B6singer?= Date: Sun, 28 Jun 2026 22:59:05 +0300 Subject: [PATCH RFC v5 10/12] clk: zte: Introduce a driver for zx297520v3 LSP clocks and resets Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260628-zx29clk-v5-10-79ff044e4192@gmail.com> References: <20260628-zx29clk-v5-0-79ff044e4192@gmail.com> In-Reply-To: <20260628-zx29clk-v5-0-79ff044e4192@gmail.com> To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Philipp Zabel , Brian Masney Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, =?utf-8?q?Stefan_D=C3=B6singer?= X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=11479; i=stefandoesinger@gmail.com; h=from:subject:message-id; bh=2m9KdtXVJgvv500dnx4UrGc5BWnSmjaCdhF3tea9QCs=; b=owEBiQJ2/ZANAwAIAT0TvMhUTxoiAcsmYgBqQX0UifAd2ySO+MGIdASV+yef6EP7QP/Rxi6AN Km75sGLJxGJAk8EAAEIADkWIQRDFvS2qgVbJ5UyXWw9E7zIVE8aIgUCakF9FBsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQPRO8yFRPGiLRKQ/+MHsDErQZHGUepdnrixoY6uDiZONrkAj CjCuBfCSX50qdYQ3Z+mex0jyF7oT99RJmX7p3T1eq2kftmE6OHIXSsRmhFPbdWYRNcCsYpFjP9P /Ni498Ro9QCU9hdrH368r+JaCj+Mxhx54rOeiHa7hHemtGZmqiS7/y6NYO9rzAtufRueEH56njB OsAM892HfQ1uW3e44wlwXL7hTWXuaielDOyi42rZfaBMEALvw3KEEMDjMYbVa6nJIjXgROMdje2 KrnsKsQ8SaPgOmra42FA2vhgel3smRTMgjb5jHJH2wkkVOEY1S8Qnq44tSsXxLbW89mS6NyCb9q 90LurREuU4oaRs6m3MtLwFhTQHs+pqjORZT3zJwBjmHbjy3aM08b88bkJdbRI1aetA6+xEu9Zz2 g9Vnp2D/k9folYDIZJ2l5/Nlaw1RwRWjjxuwzL6NoxVZC00/A3iDtc7Rj/QnVZArp/183p6UC2F MIEeRLnEHMyGG6RWLVRdyvvGhnJoEy+D56qJY4K4kSAncrfsBfeyAW/DEHyNMD5gFhWHZfHaBeE xikSAG/gyeNlNqC26uAn/ST5UqpQNBzWfvayN29v4Xu6kJGEsRNfqcbM0o8dL4/CcCQpp3Lkdke tdJ2yZ9GRIDhF5GUT+l/yNVmU2yEXbQDEeIsPxkeV/5mTqYab2Ao= X-Developer-Key: i=stefandoesinger@gmail.com; a=openpgp; fpr=4F9C2C8728019633893EBBB98CB81F9A72BBA155 "LSP" is ZTE's term for this part of the SoC, I suspect it stands for "low speed peripherals". The main UART is here, together with the flash controller and more surplus proprietary timers. It also has one more I2C controller that supposedly connects to a battery charger, SPI for displays and I2S for analog telephones. The boards I have don't have any of these components though. Signed-off-by: Stefan Dösinger --- Version 5: Removed unused tdm_lsp_sel. Fix zx297529 vs zx297520 typo. Adjusted .compatible to zte,zx297520v3-lspcrm --- drivers/clk/zte/clk-zx297520v3.c | 208 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 208 insertions(+) diff --git a/drivers/clk/zte/clk-zx297520v3.c b/drivers/clk/zte/clk-zx297520v3.c index 17e1f741b48c..f4ab065ee496 100644 --- a/drivers/clk/zte/clk-zx297520v3.c +++ b/drivers/clk/zte/clk-zx297520v3.c @@ -616,9 +616,217 @@ static struct platform_driver clk_zx297520v3_matrix = { }, }; +/* LSP clock entries have a common pattern: Bit 0 for WCLK, Bit 1 for PCLK. Bit 4 (and sometimes + * more) for WCLK mux. + * + * Bit 8 and 9 are resets handled by the reset-zte-zx297520v3 driver. + * + * Bits 15:12 can be a divisor, but not all clocks have it. Some clocks have a divisor in 19:16. + * + * The ID given in this table is the first register in the device's MMIO space. ZTE's drivers + * usually call this a version register, but it looks more like a device identifier. + * + * It looks like the registers map to devices like this: + * + * Timer reg function div dev offset(lsp + xxxx) ID + * 0x0: Read-only, probably device identifier 0x00752100 + * 0x4: timer_l1 Y 0x1000 0x02020000 + * 0x8: watchdog_l2 Y 0x2000 0x02020000 + * 0xc: watchdog_l3 Y 0x3000 0x02020000 + * 0x10: pwm N 0x4000 0x01020000 + * 0x14: i2s0 Yh 0x5000 0x01030000 + * 0x18: always 0 - - - + * 0x1c: i2s1 Yh 0x6000 0x01030000 + * 0x20: always 0 - - - + * 0x24: qspi N 0x7000 0x01040000 + * 0x28: uart1 N 0x8000 0x01060000 + * 0x2c: i2c1 N 0x9000 0x01020000 + * 0x30: spi0 Y 0xa000 0x01040000 + * 0x34: timer_lb Y 0xb000 0x02020000 + * 0x38: timer_lc Y 0xc000 0x02020000 + * 0x3c: uart2 N 0xd000 0x01060000 + * 0x40: watchdog_le Y 0xe000 0x02020000 + * 0x44: timer_lf Y 0xf000 0x02020000 + * 0x48: spi1 Y 0x10000 0x01040000 + * 0x4c: timer_l11 Y 0x11000 0x02020000 + * 0x50: tdm Yh 0x12000 0x01040000 + * + * Registers 0x58, 0x5c, 0x60, 0x64, 0x68 seem to contain more controls for i2s and tdm. + * + * I am not sure about the device at offset 0x4000 (clk reg 0x10). The ID matches that of i2c, but + * it has a larger register set. I suspect it is a PWM device, but I have not seen any ZTE kernel + * operate it - even devices with displays only use a GPIO to control the backlight. + */ + +static const char * const timer_lsp_sel[] = { + "lsp_osc32k", + "lsp_osc26m", +}; + +static const char * const uart_lsp_sel[] = { + "lsp_osc26m", + "lsp_mpll_d6", +}; + +static const char * const i2s_lsp_sel[] = { + "lsp_osc26m", + "lsp_dpll_d4", + "lsp_mpll_d6", + /* Unknown */ +}; + +static const char * const spi_lsp_sel[] = { + "lsp_osc26m", + "lsp_mpll_d4", + "lsp_mpll_d6", + /* Unknown */ +}; + +static const char * const qspi_lsp_sel[] = { + "lsp_osc26m", + "lsp_mpll_d4", + "lsp_mpll_d5", + "lsp_mpll_d6", + "lsp_mpll_d8", + "lsp_mpll_d12", + "lsp_osc26m", + "lsp_osc26m", +}; + +static const struct zx_mux_desc zx297520v3_lsp_muxes[] = { + MUX(0, "timer_l1_mux", timer_lsp_sel, 0x04, 4, 1), + MUX(0, "wdt_l2_mux", timer_lsp_sel, 0x08, 4, 1), + MUX(0, "wdt_l3_mux", timer_lsp_sel, 0x0c, 4, 1), + /* PWM: No mux bit can be set */ + MUX(0, "i2s0_mux", i2s_lsp_sel, 0x14, 4, 2), + /* 0x18: Always 0 */ + MUX(0, "i2s1_mux", i2s_lsp_sel, 0x1c, 4, 2), + /* 0x20: Always 0 */ + MUX(0, "qspi_mux", qspi_lsp_sel, 0x24, 4, 3), + MUX(0, "uart1_mux", uart_lsp_sel, 0x28, 4, 1), + MUX(0, "i2c1_mux", uart_lsp_sel, 0x2c, 4, 1), + MUX(0, "spi0_mux", spi_lsp_sel, 0x30, 4, 2), + MUX(0, "timer_lb_mux", timer_lsp_sel, 0x34, 4, 1), + MUX(0, "timer_lc_mux", timer_lsp_sel, 0x38, 4, 1), + MUX(0, "uart2_mux", uart_lsp_sel, 0x3c, 4, 1), + MUX(0, "wdt_le_mux", timer_lsp_sel, 0x40, 4, 1), + MUX(0, "timer_lf_mux", timer_lsp_sel, 0x44, 4, 1), + MUX(0, "spi1_mux", spi_lsp_sel, 0x48, 4, 2), + MUX(0, "timer_l11_mux", timer_lsp_sel, 0x4c, 4, 1), + /* TDM: No mux in LSP. Instead, it is in matrix with a separate clk line to LSP */ +}; + +static const struct zx_div_desc zx297520v3_lsp_dividers[] = { + DIV(0, "timer_l1_div", "timer_l1_mux", 0x04, 12, 4), + DIV(0, "wdt_l2_div", "wdt_l2_mux", 0x08, 12, 4), + DIV(0, "wdt_l3_div", "wdt_l3_mux", 0x0c, 12, 4), + /* PWM: No div */ + DIV(0, "i2s0_div", "i2s0_mux", 0x14, 16, 4), + /* 0x18: Always 0 */ + DIV(0, "i2s1_div", "i2s1_mux", 0x1c, 16, 4), + /* 0x20: Always 0 */ + /* qspi, uart1, i2c1: No div */ + DIV(0, "spi0_div", "spi0_mux", 0x30, 12, 4), + DIV(0, "timer_lb_div", "timer_lb_mux", 0x34, 12, 4), + DIV(0, "timer_lc_div", "timer_lc_mux", 0x38, 12, 4), + /* uart2: No div */ + DIV(0, "wdt_le_div", "wdt_le_mux", 0x40, 12, 4), + DIV(0, "timer_lf_div", "timer_lf_mux", 0x44, 12, 4), + DIV(0, "spi1_div", "spi1_mux", 0x48, 12, 4), + DIV(0, "timer_l11_div", "timer_l11_mux", 0x4c, 12, 4), + DIV(0, "tdm_div", "lsp_tdm_wclk", 0x50, 16, 4), +}; + +static const struct zx_gate_desc zx297520v3_lsp_gates[] = { + GATE(ZX297520V3_TIMER_L1_WCLK, "timer_l1_wclk", "timer_l1_div", 0x04, 0, 0), + GATE(ZX297520V3_TIMER_L1_PCLK, "timer_l1_pclk", "lsp_pclk", 0x04, 1, 0), + GATE(ZX297520V3_WDT_L2_WCLK, "wdt_l2_wclk", "wdt_l2_div", 0x08, 0, 0), + GATE(ZX297520V3_WDT_L2_PCLK, "wdt_l2_pclk", "lsp_pclk", 0x08, 1, 0), + GATE(ZX297520V3_WDT_L3_WCLK, "wdt_l3_wclk", "wdt_l3_div", 0x0c, 0, 0), + GATE(ZX297520V3_WDT_L3_PCLK, "wdt_l3_pclk", "lsp_pclk", 0x0c, 1, 0), + /* I don't know the LSP parent. It must be one of the LSP inputs though. */ + GATE(ZX297520V3_PWM_WCLK, "pwm_wclk", "lsp_osc26m", 0x10, 0, 0), + GATE(ZX297520V3_PWM_PCLK, "pwm_pclk", "lsp_pclk", 0x10, 1, 0), + GATE(ZX297520V3_I2S0_WCLK, "i2s0_wclk", "i2s0_div", 0x14, 0, 0), + GATE(ZX297520V3_I2S0_PCLK, "i2s0_pclk", "lsp_pclk", 0x14, 1, 0), + /* 0x1c: Always 0 */ + GATE(ZX297520V3_I2S1_WCLK, "i2s1_wclk", "i2s1_div", 0x1c, 0, 0), + GATE(ZX297520V3_I2S1_PCLK, "i2s1_pclk", "lsp_pclk", 0x1c, 1, 0), + /* 0x20: Always 0 */ + GATE(ZX297520V3_QSPI_WCLK, "qspi_wclk", "qspi_mux", 0x24, 0, 0), + GATE(ZX297520V3_QSPI_PCLK, "qspi_pclk", "lsp_pclk", 0x24, 1, 0), + GATE(ZX297520V3_UART1_WCLK, "uart1_wclk", "uart1_mux", 0x28, 0, 0), + GATE(ZX297520V3_UART1_PCLK, "uart1_pclk", "lsp_pclk", 0x28, 1, 0), + GATE(ZX297520V3_I2C1_WCLK, "i2c1_wclk", "i2c1_mux", 0x2c, 0, 0), + GATE(ZX297520V3_I2C1_PCLK, "i2c1_pclk", "lsp_pclk", 0x2c, 1, 0), + GATE(ZX297520V3_SPI0_WCLK, "spi0_wclk", "spi0_div", 0x30, 0, 0), + GATE(ZX297520V3_SPI0_PCLK, "spi0_pclk", "lsp_pclk", 0x30, 1, 0), + GATE(ZX297520V3_TIMER_LB_WCLK, "timer_lb_wclk", "timer_lb_div", 0x34, 0, 0), + GATE(ZX297520V3_TIMER_LB_PCLK, "timer_lb_pclk", "lsp_pclk", 0x34, 1, 0), + GATE(ZX297520V3_TIMER_LC_WCLK, "timer_lc_wclk", "timer_lc_div", 0x38, 0, 0), + GATE(ZX297520V3_TIMER_LC_PCLK, "timer_lc_pclk", "lsp_pclk", 0x38, 1, 0), + GATE(ZX297520V3_UART2_WCLK, "uart2_wclk", "uart2_mux", 0x3c, 0, 0), + GATE(ZX297520V3_UART2_PCLK, "uart2_pclk", "lsp_pclk", 0x3c, 1, 0), + GATE(ZX297520V3_WDT_LE_WCLK, "wdt_le_wclk", "wdt_le_div", 0x40, 0, 0), + GATE(ZX297520V3_WDT_LE_PCLK, "wdt_le_pclk", "lsp_pclk", 0x40, 1, 0), + GATE(ZX297520V3_TIMER_LF_WCLK, "timer_lf_wclk", "timer_lf_div", 0x44, 0, 0), + GATE(ZX297520V3_TIMER_LF_PCLK, "timer_lf_pclk", "lsp_pclk", 0x44, 1, 0), + GATE(ZX297520V3_SPI1_WCLK, "spi1_wclk", "spi1_div", 0x48, 0, 0), + GATE(ZX297520V3_SPI1_PCLK, "spi1_pclk", "lsp_pclk", 0x48, 1, 0), + GATE(ZX297520V3_TIMER_L11_WCLK, "timer_l11_wclk", "timer_l11_div", 0x4c, 0, 0), + GATE(ZX297520V3_TIMER_L11_PCLK, "timer_l11_pclk", "lsp_pclk", 0x4c, 1, 0), + GATE(ZX297520V3_TDM_WCLK, "tdm_wclk", "tdm_div", 0x50, 0, 0), + GATE(ZX297520V3_TDM_PCLK, "tdm_pclk", "lsp_pclk", 0x50, 1, 0), +}; + +static const char * const zx297520v3_lsp_inputs[] = { + "mpll_d5", "mpll_d4", "mpll_d6", "mpll_d8", "mpll_d12", + "osc26m", "osc32k", "tdm_wclk", "dpll_d4" +}; + +static const char * const zx297520v3_lsp_inputs_enable[] = { + "pclk" +}; + +static const struct zx_clk_data zx297520v3_lsprm_data = { + .inputs_enable = zx297520v3_lsp_inputs_enable, + .num_inputs_enable = ARRAY_SIZE(zx297520v3_lsp_inputs_enable), + .inputs = zx297520v3_lsp_inputs, + .num_inputs = ARRAY_SIZE(zx297520v3_lsp_inputs), + .muxes = zx297520v3_lsp_muxes, + .num_muxes = ARRAY_SIZE(zx297520v3_lsp_muxes), + .divs = zx297520v3_lsp_dividers, + .num_divs = ARRAY_SIZE(zx297520v3_lsp_dividers), + .gates = zx297520v3_lsp_gates, + .num_gates = ARRAY_SIZE(zx297520v3_lsp_gates), + .reset_auxdev_name = "zx297520v3_lsprst" +}; + +static const struct of_device_id of_match_zx297520v3[] = { + { .compatible = "zte,zx297520v3-lspcrm", .data = &zx297520v3_lsprm_data }, + { } +}; +MODULE_DEVICE_TABLE(of, of_match_zx297520v3); + +static int zx297520v3_lspclk_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + return zx_clk_common_probe(dev, dev->of_node, device_get_match_data(dev)); +} + +static struct platform_driver clk_zx297520v3_lsp = { + .probe = zx297520v3_lspclk_probe, + .driver = { + .name = "clk-zx297520v3", + .of_match_table = of_match_zx297520v3, + }, +}; + static struct platform_driver * const clk_zx297520v3_drivers[] = { &clk_zx297520v3_top, &clk_zx297520v3_matrix, + &clk_zx297520v3_lsp, }; static int __init clk_zx297520v3_init(void) -- 2.53.0