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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/10/22 09:45, Kavyasree Kotagiri wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Each flexcom of LAN966 SoC has 2 chip selects. For each chip > select of each flexcom there is a configuration register > FLEXCOM_SHARED[0-4]:SS_MASK[0-1]. The width of configuration > register is 21 because there are 21 shared pins on each of > which the chip select can be mapped. Each bit of the register > represents a different FLEXCOM_SHARED pin. > > Signed-off-by: Kavyasree Kotagiri > --- > drivers/mfd/atmel-flexcom.c | 49 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 49 insertions(+) > > diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c > index 559eb4d352b6..b8fc476e411d 100644 > --- a/drivers/mfd/atmel-flexcom.c > +++ b/drivers/mfd/atmel-flexcom.c > @@ -27,6 +27,12 @@ > #define FLEX_MR_OPMODE_MASK (0x3 << FLEX_MR_OPMODE_OFFSET) > #define FLEX_MR_OPMODE(opmode) (((opmode) << FLEX_MR_OPMODE_OFFSET) & \ > FLEX_MR_OPMODE_MASK) > +#ifdef CONFIG_SOC_LAN966 > +/* LAN966 register offsets */ > +#define FLEX_SHRD_SS_MASK_0 0x0 > +#define FLEX_SHRD_SS_MASK_1 0x4 > +#define FLEX_SHRD_MASK 0x1FFFFF > +#endif > > struct atmel_flexcom { > void __iomem *base; > @@ -39,6 +45,10 @@ static int atmel_flexcom_probe(struct platform_device *pdev) > struct device_node *np = pdev->dev.of_node; > struct resource *res; > struct atmel_flexcom *ddata; > +#ifdef CONFIG_SOC_LAN966 > + u32 lan966x_ss_pin, lan966x_cs, val; > + void __iomem *shared_base; > +#endif > int err; > > ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); > @@ -76,6 +86,45 @@ static int atmel_flexcom_probe(struct platform_device *pdev) > */ > writel(FLEX_MR_OPMODE(ddata->opmode), ddata->base + FLEX_MR); > > +#ifdef CONFIG_SOC_LAN966 this may be better handled via a dedicated compatible to which you associate a capabilities structure and use the caps to avoid ifdefery throughout the code. Cheers, ta > + /* > + * Flexcom Shared Register Configurations: > + * In order to map chip select index X of Flexcom Y to FLEXCOM_SHARED Z, > + * write 0 to bit index Z of FLEXCOM_SHARED[Y]:SS_MASK[X]. > + */ > + if (of_property_read_bool(np, "lan966x-flx-shared-cfg")) { > + /* Shared pin */ > + err = of_property_read_u32(np, "lan966x-ss-pin", &lan966x_ss_pin); > + if (err) > + return err; > + > + if (lan966x_ss_pin > 20) > + return -EINVAL; > + > + /* chip-select */ > + err = of_property_read_u32(np, "lan966x-cs", &lan966x_cs); > + if (err) > + return err; > + > + if (lan966x_cs > 1) > + return -EINVAL; > + > + shared_base = devm_ioremap_resource(&pdev->dev, > + platform_get_resource(pdev, IORESOURCE_MEM, 1)); > + if (IS_ERR(shared_base)) { > + dev_dbg(&pdev->dev, "No Flexcom shared register config\n"); > + return PTR_ERR(shared_base); > + } > + > + val = ~(1 << lan966x_ss_pin) & FLEX_SHRD_MASK; > + > + if (lan966x_cs == 0) > + writel(val, shared_base + FLEX_SHRD_SS_MASK_0); > + else > + writel(val, shared_base + FLEX_SHRD_SS_MASK_1); > + } > +#endif > + > clk_disable_unprepare(ddata->clk); > > return devm_of_platform_populate(&pdev->dev); > -- > 2.17.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel