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Date: Fri, 29 May 2020 10:58:05 -0500 From: Dinh Nguyen <dinguyen@...nel.org> To: linux-kernel@...r.kernel.org Cc: dinguyen@...nel.org, devicetree@...r.kernel.org, linux-spi@...r.kernel.org, broonie@...nel.org, robh+dt@...nel.org, Sergey.Semin@...kalelectronics.ru, fancer.lancer@...il.com, andriy.shevchenko@...ux.intel.com, lars.povlsen@...rochip.com, liang.j.jin@...csson.com Subject: [PATCHv4 1/2] spi: dw: add reset control Add mechanism to get the reset control and deassert it in order to bring the IP out of reset. Signed-off-by: Liang Jin J <liang.j.jin@...csson.com> Signed-off-by: Dinh Nguyen <dinguyen@...nel.org> --- v4: no change v3: allow for other failures remove tab for rstc reset_control v2: use _get_optional_exclusive put IP back into reset if there was an error in probe function --- drivers/spi/spi-dw-mmio.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c index 0894b4c09496..a1b87d4606ba 100644 --- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -19,6 +19,7 @@ #include <linux/acpi.h> #include <linux/property.h> #include <linux/regmap.h> +#include <linux/reset.h> #include "spi-dw.h" @@ -29,6 +30,7 @@ struct dw_spi_mmio { struct clk *clk; struct clk *pclk; void *priv; + struct reset_control *rstc; }; #define MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24 @@ -224,6 +226,14 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) if (ret) goto out_clk; + /* find an optional reset controller */ + dwsmmio->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, "spi"); + if (IS_ERR(dwsmmio->rstc)) { + ret = PTR_ERR(dwsmmio->rstc); + goto out_clk; + } + reset_control_deassert(dwsmmio->rstc); + dws->bus_num = pdev->id; dws->max_freq = clk_get_rate(dwsmmio->clk); @@ -257,6 +267,8 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) clk_disable_unprepare(dwsmmio->pclk); out_clk: clk_disable_unprepare(dwsmmio->clk); + reset_control_assert(dwsmmio->rstc); + return ret; } @@ -268,6 +280,7 @@ static int dw_spi_mmio_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); clk_disable_unprepare(dwsmmio->pclk); clk_disable_unprepare(dwsmmio->clk); + reset_control_assert(dwsmmio->rstc); return 0; } -- 2.17.1
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